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  • 101.
    Dumitrescu, Delia
    et al.
    University of Borås, Swedish School of Textiles.
    Lundstedt, Lotta
    University of Borås, Swedish School of Textiles.
    Persson, Anna
    University of Borås, Swedish School of Textiles.
    Satomi, Mika
    University of Borås, Swedish School of Textiles.
    Repetition: interactive expressions of pattern translation2012In: Proceedings The Art of Research 2012, The art of research 2012 Making, Reflecting and understading, 28-29 November 2012 at Aalto University School of Arts, Design and Architecture Helsinki, Finland, 2012Conference paper (Refereed)
    Abstract [en]

    As a way of opening a space where methods from the fields of fashion design, textile design and interaction design overlap, the project Repetition intersects different methodologies through practice-based research in design. Experiments were conducted to explore ways of creating relationships between body and space by means of translating information as pattern design between garments and interactive knitted walls. By arranging a startup performance, we reflected on the expressional variables that influence the expression of the pattern translations; variables concerning the garments, the walls, the print and the movements were illustrated by the expressions found. The result formulates specific descriptions regarding accuracy and distribution of pattern translation, illustrating basic concepts of pattern formations identified in visual changes appearing in the garment. By communicating our understanding of basic expressions, Repetition aims to formulate a new framework for collaborative work as a method for further design.

  • 102. Dural Erem, A.
    et al.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Demirpek, U.
    Özcan, G.
    The Antimicrobial Efficiency of Polyamide 6/Silver Nanocomposites2010Conference paper (Other academic)
  • 103. Dural Erem, Aysin
    et al.
    Ozcan, G
    Erem, H H
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Antimicrobial activity of poly(l-lactide acid)/silver nanocomposite fibers2013In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 83, no 20, p. 2111-2117Article in journal (Refereed)
    Abstract [en]

    Silver (Ag) nanoparticles (NP) and poly(lactide acid) (PLA) granules were microcompounded to form a nanocomposite. A series of PLA nanocomposite fibers containing, respectively, 0, 0.5, 1, 3 or 5 wt% Ag were produced and their antimicrobial activity against Gram-negative and Gram-positive bacteria evaluated. It was found that the PLA/Ag nanocomposite fibers exhibited increased antimicrobial activity, depending on the filler content. On the other hand, mechanical and thermal characterization tests, including thermogravimetric analysis, differential scanning calorimetry and tensile testing, showed that increasing concentrations of Ag hindered the mechanical properties of Nanocomposites due to partial agglomeration, leading to the generation of flaws. The crystallinity of the fibers was found to decrease by about 23% if the Ag content was increased to 5%. This could be attributed to a more rapid cooling rate resulting from the high thermal conductivity of the Ag particles.

  • 104. Dural Erem, Aysin
    et al.
    Ozcan, G
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Bacteriostatic PLA/Chitosan Composite Fİlms2012Conference paper (Refereed)
  • 105. Dural Erem, Aysin
    et al.
    Ozcan, G
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Cakmak, M
    Antimicrobial Activity of PP/TiO2 Fi2012Conference paper (Refereed)
  • 106. Dural Erem, Aysin
    et al.
    Ozcan, G
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Erem, H H
    The production of Chitosan and Polypropylene/Chitosan Composites2010Conference paper (Refereed)
  • 107. Dural Erem, Aysin
    et al.
    Ozcan, Gulay
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    In vitro assessment of antimicrobial polypropylene/zinc oxide nanocomposite fibers2013In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 83, no 20, p. 2152-2163Article in journal (Refereed)
    Abstract [en]

    A series of polypropylene (PP) nanocomposite fibres containing respectively 0, 0.5, 1, 3, and 5 wt% ZnO nanoparticles (NPs) were prepared by melt spinning. The antimicrobial activity of these fibers against Staphylococcus aureus (ATCC 6538) as a Gram-positive bacterium and Klebsiella pneumoniae (ATCC 4352) as a Gram-negative bacterium was evaluated. It was confirmed by scanning electron microscopy that the dispersion of the NPs within the PP matrix was homogeneous. Although such homogeneity the fibers are unable to exhibit antimicrobial activity. The absorption properties of the fibers was then investigated and found to be inadequate, so cold plasma and chemical finishing were applied to improve their absorptivity. After this treatment the PP/ZnO nanocomposite fibers exhibited increasing antimicrobial effectiveness with filler content. In addition, mechanical and thermal characterization tests showed that increasing concentration of ZnO–NPs improved the mechanical properties of the fiber due to the interface between the matrix and the nanoparticles sharing the stress. The crystallinity of the fibers was found to decrease by about 7% as the level of ZnO increased to 5%. This was attributed to the more rapid cooling experienced in the presence of ZnO particles of high thermal conductivity.

  • 108. Dural-Erem, Aysin
    et al.
    Erem, Hasan
    Ozcan, Gulay
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Anatase titanium dioxide loaded polylactide membranous films: preparation, characterization, and antibacterial activity assessment2015In: Journal of the Textile Institute, ISSN 0040-5000, E-ISSN 1754-2340, Vol. 106, no 6Article in journal (Refereed)
    Abstract [en]

    In this study, the preparation method and characteristics of anatase titanium dioxide (TiO2) nanoparticle-loaded polylactide (PLA) films and their antibacterial efficacy against Klebsiella pneumoniae (ATCC 4352) and Staphylococcus aureus (ATCC 6538) bacterium were studied. A series of PLA nanocomposites containing, respectively, 0, 1, and 5% (wt.) titanium dioxide (TiO2) nanoparticles were prepared by melt intercalation method. The effect of TiO2 nanoparticles on the thermal and mechanical characteristics of the films was determined. Thermal analysis showed that the glass transition temperature, crystallization temperature, melting temperature, and decomposition temperatures (Td0.5 and Td0.05) decreased with the filler content. The results obtained from tensile tests showed that TiO2 nanoparticles reduced the mechanical properties and moduli of the PLA films. On the other hand, the water absorption properties of the nanocomposite films increased with the addition of nanoparticles and nanocomposite films exhibited bacteriostatic and limited bactericidal efficacy according to AATCC 147. Consequently, nanocomposite films may be good materials for medical applications due to their membranous properties.

  • 109. Dural-Erem, Aysin
    et al.
    Niehaus, Kim-Laura
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Development of Probiotic Printings for Polyester Fabrics.2018In: Journal of Textiles and Engineer (Tekstil ve Mühendis), ISSN 1300-7599, Vol. 25, no 111, p. 208-213Article in journal (Refereed)
  • 110. Dural-Erem, Aysin
    et al.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Development of coating for incorporation of beneficial spores on hospital textiles2018In: Fibres and Textiles in Eastern Europe, ISSN 1230-3666, Vol. 5, no 131, p. 59-62Article in journal (Refereed)
  • 111.
    Dural-Erem, Aysin
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Wessman, Per
    RISE Research Institutes of Sweden, Surface, Process and Formulation.
    Husmark, Ulrika
    SCA Hygiene Products AB.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Biocontrol of solid surfaces in hospitals using microbial-based wipes2019In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 89, no 2, p. 216-222Article in journal (Refereed)
    Abstract [en]

    Hospital-acquired infections have become a major challenge which threaten the hospitalized patients’ safety. The presence of nosocomial pathogens is generally reported in connection with solid surfaces near patient environments. These surfaces become significant sources of transmission and lead most often to the contamination and cross-contamination of nosocomial pathogens to the patients and staff. This paper investigates strategies to apply beneficial bacteria on viscose-based nonwoven wipes and the viability of these beneficial bacteria on the wipes along with characterization of the physical properties of the wipes. Major findings include that it is possible to produce dry wipes which contain an adequate number of beneficial bacteria or spores. After these wipes are wetted, they can release a certain number of bacteria from the wetted wipes. These released beneficial bacteria can inhibit pathogens by growing and colonizing on the wiped surfaces.

  • 112.
    Eneh, Sandra
    University of Borås, Faculty of Textiles, Engineering and Business.
    Showroom the Future of Online Fashion Retailing 2.0: Enhancing the online shopping experience2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The following have been rectified in response to previous evaluation by examiner Olof Bruninge. -We have solely chosen qualitative methods in data collection and analysis by making use of data gathered from focus group workshop. The findings have been coded and analysed descriptively. -We have reformulated research questions and replaced the hypothesis with open questions. Allowing us to explore the participants’ behaviour rather than testing hypothesis. -All quantitative measures have been replaced with qualitative analysis and descriptions. -We have provided tables with results from focus group findings to increase transparency in our data

  • 113.
    Engelund, Emil Tang
    et al.
    Copenhagen University.
    Thygesen, Lisbeth Garbrecht
    Copenhagen University.
    Svensson, Staffan
    University of Borås, Faculty of Textiles, Engineering and Business.
    Hill, Callum A. S.
    Napier University.
    A critical discussion of the physics of wood-water interactions2013In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 47, no 1, p. 141-161Article in journal (Refereed)
  • 114. Erem, Aysin Dural
    et al.
    Ozcan, Gulay
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Cakmak, Mukerrem
    In vitro assesment of antimicrobial activity and characteristics of polyamide 6/silver nanocomposite fibers2013In: Fibers And Polymers, ISSN 1229-9197, E-ISSN 1875-0052, Vol. 14, no 9, p. 1415-1421Article in journal (Refereed)
    Abstract [en]

    In this study, the preparation method and characteristics of silver (Ag) nanoparticle (NP) loaded polyamide 6 (PA6) nanocomposite and its antimicrobial activity against Klebsiella pneumonia and Staphylococcus aureus were investigated. The melt intercalation method was used to prepare a series of PA 6 nanocomposite fibers containing, 0; 1; 3; 5 % (wt.) Ag. PA6/Ag nanocomposite fibers exhibit increased antimicrobial efficiency with the increase of nanoparticle contents. On the other hand, thermal characterization tests show that the increased concentration of Ag nanoparticles reduces the mechanical properties due to their partial agglomeration leading to flaw generation. The crystallinity of the fibers was found to decrease about 10 % with increase of Ag to 5 %. This was attributed to faster cooling rate experienced in the presence of high thermal conductivity Ag particles.

  • 115. Erem, Aysin
    et al.
    Ozcan, Gulay
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Cakmak, Mukerrem
    In vitro assesment of antimicrobial activity and characteristics of polyamide 6/silver nanocomposite fibers2013In: Fibers And Polymers, ISSN 1229-9197, E-ISSN 1875-0052, Vol. 14, no 9, p. 1415-1421Article in journal (Refereed)
    Abstract [en]

    In this study, the preparation method and characteristics of silver (Ag) nanoparticle (NP) loaded polyamide 6 (PA6) nanocomposite and its antimicrobial activity against Klebsiella pneumonia and Staphylococcus aureus were investigated. The melt intercalation method was used to prepare a series of PA 6 nanocomposite fibers containing, 0; 1; 3; 5 % (wt.) Ag. PA6/Ag nanocomposite fibers exhibit increased antimicrobial efficiency with the increase of nanoparticle contents. On the other hand, thermal characterization tests show that the increased concentration of Ag nanoparticles reduces the mechanical properties due to their partial agglomeration leading to flaw generation. The crystallinity of the fibers was found to decrease about 10 % with increase of Ag to 5 %. This was attributed to faster cooling rate experienced in the presence of high thermal conductivity Ag particles.

  • 116. Erem Dural, A.
    et al.
    Ozcan, G.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Antibacterial activity of PA6/ZnO nanocomposites fibers2011In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 81, no 16, p. 1638-1646Article in journal (Refereed)
    Abstract [en]

    In this study, ZnO-loaded PA6 nanocomposite preparation and its antibacterial activity are investigated. This work aims to study the effect of the sizes and amount of the ZnO nanofiller on the antibacterial, mechanical, and thermal properties of the PA6/ZnO nanocomposites. The melt intercalation method is applied to prepare polyamide 6 (PA6) nanocomposite fibers, including 0, 0.5, 1, 3, 5 wt % zinc oxide (ZnO), using a laboratory-scale compounder. The antibacterial activity of the fibers against Staphylococcus aureus (ATCC 6538) as a gram positive bacterium and Klebsiella pneumoniae (ATCC 4352) as a gram negative bacterium is determined according to ASTM E 2149-0. Mechanical and thermal characterization tests are performed according to relevant standards (ASTM D7426-08, ASTM E1131-08, ASTM D3822-07; DSC, TGA, tensile tests). It is found that the dispersion of the ZnO particles within the PA6 matrix is homogenous according to scanning electron microscopy results. Antibacterial activity tests show that PA6/ZnO nanocomposite fibers exhibit antibacterial efficiency related to their nanoparticle contents. An increase in the amount of nanoparticles causes an increase of the antibacterial activity of the fibers. On the other hand, mechanical and thermal characterization tests show that the addition of ZnO nanoparticles does not affect the strength and thermal properties of the nanocomposites for these loadings.

  • 117.
    Eriksson, Siw
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Sandsjö, Leif
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. MedTech West.
    Three-dimensional Fabrics as Medical Textiles2015In: Advances in 3D Textiles: A volume in Woodhead Publishing Series in Textiles / [ed] X. Chen, Woodhead Publishing Limited, 2015, p. 305-340Chapter in book (Other academic)
    Abstract [en]

    The number of 3D textile applications in medicine is rapidly increasing as new technology and procedures are introduced in health care.  A first estimate of current medical applications of both general and 3D textiles is presented based on the medical devices classification system established by the US Food and Drug Administration. The textile specifics for these applications are covered from a textile technique perspective where the different 3D weaving as well as knitting, braiding and non-woven techniques are described and how their properties they can contribute in medical applications. In addition, emerging opportunities based on smart textiles as part of textile systems are described on a general level. The strong application areas of 3D medical textiles, i.e. wound management, vascular grafting and scaffolding for tissue engineering are covered in detail both from the medical and textiles perspective. Finally, some future lines of development are suggested and a short discussion on how new 3D textiles applications can be developed in close cooperation between the textile industry and the health care sector is presented.

  • 118.
    Esmaeili, Nima
    et al.
    University of Bolton.
    Jahandideh, Arash
    South Dakota State University.
    Muthukumarappan, Kasiviswanathan
    South Dakota State University.
    Åkesson, Dan
    University of Borås, Faculty of Textiles, Engineering and Business.
    Skrifvars, Mikael
    University of Borås, Faculty of Textiles, Engineering and Business.
    Synthesis and characterization of methacrylated star-shaped poly(lactic acid) emplying core moilecules with different hydroxyl groups2017In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 134, no 39, article id 45341Article in journal (Refereed)
    Abstract [en]

    A set of novel bio-based star-shaped thermoset resins was synthesized via ring-opening polymerization of lactide and employing different multi-hydroxyl core molecules, including ethylene glycol, glycerol, and erythritol. The branches were end-functionalized with methacrylic anhydride. The effect of the core molecule on the melt viscosity, the curing behavior of the thermosets and also, the thermomechanical properties of the cured resins were investigated. Resins were characterized by Fourier-transform infrared spectroscopy, 13C-NMR, and 1H-NMR to confirm the chemical structure. Rheological analysis and differential scanning calorimetry analysis were performed to obtain the melt viscosity and the curing behavior of the studied star-shaped resins. Thermomechanical properties of the cured resins were also measured by dynamic mechanical analysis. The erythritol-based resin had superior thermomechanical properties compared to the other resins and also, lower melt viscosity compared to the glycerol-based resin. These are of desired characteristics for a resin, intended to be used as a matrix for the structural composites. Thermomechanical properties of the cured resins were also compared to a commercial unsaturated polyester resin and the experimental results indicated that erythritol-based resin with 82% bio-based content has superior thermomechanical properties, compared to the commercial polyester resin. Results of this study indicated that although core molecule with higher number of hydroxyl groups results in resins with better thermomechanical properties, number of hydroxyl groups is not the only governing factor for average molecular weight and melt viscosity of the uncured S-LA resins.

  • 119. Esmaeli, Nima
    et al.
    Bakare, Fatimat Oluwatoyin
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Afshar, Shahrzad Javanshir
    Åkesson, Dan
    University of Borås, School of Engineering.
    Mechanical properties for bio-based thermoset composites made from lactic acid, glycerol and viscose fibers2014In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 22, no 1, p. 603-613Article in journal (Refereed)
    Abstract [en]

    Regenerated cellulose fibers were used to produce thermoset composites from a bio-based thermoset resin synthesized from lactic acid and glycerol. The resin was impregnated into the regenerated cellulose fiber and compression molded at elevated temperature to produce thermoset composites. Different fiber alignments (unidirectional and bidirectional), different reinforcement type (warp-knitted and non-woven) and varying fiber loading (65, 70 and 75 wt%) were investigated. The composites were characterized by flexural, tensile and Charpy impact testing and by dynamical mechanical thermal analysis. Water uptake and ageing properties in climate chamber were also characterized for the composites. The results showed that the composites had good mechanical properties. They can be produced with up to 70 wt% fiber content when using unidirectional (UD) and bidirectional fiber (BD) alignment, and with up to 65 wt% fiber content when using the non-woven (NW) reinforcement. The tensile modulus ranged between 11 and 14 GPa for UD composites, 7 and 8.5 GPa for BD composites and 5 and 7.5 GPa for NW composites. The flexural modulus ranged between 10 and 11.5 GPa for UD composites, 5 and 6.5 GPa for BD composites and 5 and 6 GPa for NW composites. The impact strength ranged between 130 and 150 kJ/m2 for UD composites, 98 and 110 kJ/m2 for BD composites and 17 and 20 kJ/m2 for NW composites. The result of the ageing test showed that the mechanical properties of the composites deteriorate with ageing but the addition of styrene somewhat counteracts the degradation, making the composite applicable for indoor use.

  • 120.
    Eutionnat-Diffo, Prisca
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Campagne, Christine
    Zeng, Xianyi
    Cayla, Aurelie
    Guan, Jinping
    Chen, Yan
    Correlation between heat transfer of polyester textiles and its adhesion with 3D-printed extruded thermoplastic filaments2018In: 18th AUTEX World Textile Conference, June 20-22, 2018, Istanbul, Turkey / [ed] IOP publishers, 2018, p. 118-121, article id 3132Conference paper (Refereed)
    Abstract [en]

    FDM technology used for printing functionalized layers on textiles brought new challenges such as the understanding and the improvement of the adhesion performance of the thermoplastic filaments on synthetic textile materials. In addition to the impact of printing parameters, the correlation between the heat transfer and structure of the textile material and the adhesion performance after varying printer platform temperature was an important parameter considered in this paper. A factorial design, using material density, direction, and structure and platform temperature as factors, was followed. 3D-printed materials made of PLA filaments deposited on polyester woven and knit materials were manufactured on a dual-head printer and their adhesion was measured according to DIN EN ISO 13937-2 and ISO 11339 and the heat transfer of the fabrics according to ASTM D4966-98, ISO 6330 and ISO 22007-2. The findings showed that the heat transfer and structure of textile materials affect the adhesion properties of the 3D-printed material.

  • 121.
    Eutionnat-Diffo, Prisca
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Christine, Campagne
    ENSAIT.
    Zeng, Xianyi
    ENSAIT.
    Aurelie, Cayla
    ENSAIT.
    CHEN, Yan
    Soochow university.
    Guan, Jinping
    Soochow university.
    Study of the electrical resistance of conductive PLA deposited onto fabrics through 3D printing2019Conference paper (Refereed)
    Abstract [en]

    In this study, conductive tracks are integrated onto textiles through Fused Deposition Modelling (FDM) process and the correlation between the FDM process parameters, the textile properties (the porosity and the structure for instance) and the electrical resistance of the composites is investigated. Many researchers have studied the electrical conductivity of polymers composites using incorporation of conductive fillers such as carbon black or carbon nanotube–polymer composites and the effect of the 3D printing process parameters, such as extruder temperature, on the electrical properties [1–7]. However, in this paper, in addition to study and understand the electrical properties of these conductive materials deposited onto textiles, they are maximized to guarantee the use of the textile composites in smart textiles field.Findings are very promising and important in the development of functionalized textiles as they demonstrate the feasibility of enhancing the electrical conductivity of textile composite materials through theoretical models based on the experimental data.

  • 122. Fatarella, Enrico
    et al.
    Mylläri, Ville
    Ruzzante, Marco
    Pogni, Rathish
    Baratto, Maria
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Syrjälä, Seppo
    Järvelä, Pentti
    Sulfonated polyetheretherketone/polypropylene polymer blends for the production of photoactive materials2014In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 132, no 8Article in journal (Refereed)
    Abstract [en]

    Sulfonated polyetheretherketone (SPEEK) was synthesized via a mono-substitution reaction of PEEK in concentrated sulphuric acid and was blended with polypropylene (PP) in 2–10%w/w concentration to be used for the production of photoactive thermoplastic products. SPEEK and SPEEK/PP blends were characterized using FTIR, DSC, TGA, NMR, rheology, SEM, and EPR. Under UV-Vis irradiation, stable benzophenone ketyl (BPK) radicals were generated by hydrogen extraction from PP. By increasing the amount of SPEEK in the polymer blend a linear increase in the BPK radicals was achieved according to the EPR data. DSC and TGA tests indicated weaknesses in the thermal stability of SPEEK but according to the rheological tests this should not have a major effect on processabililty. The optimal amount of SPEEK in the blend was obtained at 5%w/w. This concentration provided a good compromise between radical concentration, material processability, and cost

  • 123. George, G.
    et al.
    Jose, E.T.
    Jayanarayanan, K.
    Nagarajan, E.R.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Joseph, K.
    Novel bio-commingled composites based on jute/polypylene yarns: Effect of chemical treatment on the mechanical properties2012In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 43, no 1, p. 219-230Article in journal (Refereed)
    Abstract [en]

    This paper mainly investigates the fabrication process of jute yarn reinforced, bidirectional thermoplastic commingled composites (both untreated and treated). Commingling method was used to prepare the composites wherein the Polypropylene yarn (PP yarn) and jute yarn were wound together onto a metal plate in a particular configuration and then compression moulded. The mechanical properties of the composites prepared from chemically treated jute yarn were found to increase substantially compared to those of untreated ones. The surface morphologies of the fracture surfaces of the composites were recorded using scanning electron microscope (SEM). The SEM micrographs reveal that interfacial bonding between the treated jute yarn and the matrix has improved significantly by chemical treatments. The various chemical treatment mechanisms have been supported by FT-IR spectra. Theoretical modelling was used to predict the tensile properties and was found to be in accordance with the experimental results.

  • 124. George, Gejo
    et al.
    Joseph, Kuruvilla
    Nagarajan, E R
    Jose, E Tomlal
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Thermal, calorimetric and crystallisation behaviour of polypropylene/jute yarn bio-composites fabricated by commingling technique2013In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 48, p. 110-120Article in journal (Refereed)
    Abstract [en]

    Commingled biocomposites based on polypropylene/jute yarns were prepared using commingling technique. The thermal and calorimetric behaviour of these commingled composites were studied with respect to fibre content and various chemical treatments. The thermal stability of the composites was found to be in between that of jute fibre and neat polypropylene (PP). Different chemical treatments increased the thermal stability of the composites due to increased interfacial adhesion between the matrix and reinforcement. Jute yarn acts as nucleating agents and favours the process of crystallisation thereby increasing the crystallisation temperature. Chemical treatments further increased the crystallisation temperature as a result of better interfacial adhesion between jute yarn and PP matrix. The close proximity of jute yarns weakens the mechanical bonds between PP molecules resulting in marginal lowering of melting temperatures. Polarized optical microscopic studies revealed the formation of transcrystalline layer around the jute fibre after 6 h.

  • 125. Goutianos, S.
    et al.
    Peijs, T.
    Nyström, B.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Development of flax fibre based textile reinforcements for composite applications.2006In: Applied Composite Materials, ISSN 0929-189X, E-ISSN 1573-4897, Vol. 13, no 4, p. 199-Article in journal (Refereed)
  • 126. Granström, Jimmy
    et al.
    Gällstedt, Mikael
    Arias, Oscar
    Blomfeldt, Thomas
    Sojoudi, Hossein
    Kim, Yongjin
    Kim, Hyungchul
    Cho, Sung-Woo
    University of Borås, School of Engineering.
    Graham, Samuel
    Hedenqvist, Mikael
    Measurement technologies and encapsulation approaches for multi-layer barrier films2011Conference paper (Other academic)
  • 127.
    Guldris, Lorena
    et al.
    Chalmers University of Technology.
    Bengtsson, Magnus
    Chalmers University of Technology.
    Evertsson, Magnus
    Chalmers University of Technology.
    'Mineralogical characterization, reduction and liberation analysis of tungsten ore2016In: Emerging Trends in Minerals Engineeing, 2016Conference paper (Refereed)
    Abstract [en]

    Due to the raising global demand for rare earth minerals there is an increased need for development of more efficient extraction processes of such materials. Comminution models commonly predict size reduction with the focus on a single component, but few models integrate the mineral composition. This paper focuses on defining a multi component model, combining the size reduction and the mineral liberation. In this study, compressive breakage and liberation analysis experiments were conducted on a Tantalum ore. The work is divided into two stages, firstly the methodology of fitting measured data into a size reduction model, and secondly the multi component modelling where the liberation results are integrated into the size reduction model. Results from the work show that in order to address multi component modelling it is necessary to focus on dominating factors such as dominating quantities of different minerals. It was also seen that the model can be used for determining the choice of compression ratio in crushing for optimizing liberation.

  • 128.
    Guldris, Lorena
    et al.
    Chalmers Institute of Technology.
    Bengtsson, Magnus
    Chalmers Institute of Technology.
    Evertsson, Magnus
    Chalmers Institute of Technology.
    Modelling Reduction and Liberation for Rare Earth Minerals Applications2016In: MEI 10th International Comminution Symposium (Comminution '16), 2016Conference paper (Refereed)
    Abstract [en]

    Due to the raising global demand for rare earth minerals there is an increased need for development of more efficient extraction processes of such materials. Comminution models commonly predict size reduction with the focus on a single component, but few models integrate the mineral composition. This paper focuses on defining a multi component model, combining the size reduction and the mineral liberation. In this study, compressive breakage and liberation analysis experiments were conducted on a Tantalum ore. The work is divided into two stages, firstly the methodology of fitting measured data into a size reduction model, and secondly the multi component modelling where the liberation results are integrated into the size reduction model. Results from the work show that in order to address multi component modelling it is necessary to focus on dominating factors such as dominating quantities of different minerals. It was also seen that the model can be used for determining the choice of compression ratio in crushing for optimizing liberation.

  • 129. Guldris, Lorena
    et al.
    Bengtsson, Magnus
    Chalmers University of Technology.
    Evertsson, Magnus
    Chalmers University of Technology.
    Reduction and fracture analysis of a tungsten ore and its use for fundamental liberation modelling2016In: Procemin 2016. 12th International Mineral Processing Conference / [ed] Claudia Velásquez, 2016Conference paper (Refereed)
    Abstract [en]

    Nowadays there are numerous tungsten applications and uses, due to this the global demand for tungsten has increased the extraction and production of this rare earth mineral. The liberation of tungsten is achieved by using comminution equipment, e.g. crushers, there is a lack of knowledge how tungsten is liberated by means of compressive breakage. Even though it is possible to use find comminution models for explaining the size reduction, there is also need to implement a mineral liberation model into theses comminution models. This paper will focus on a fundamental model that combine and integrate the size reduction with the mineral liberation in early stages of the breakage process. This work focuses on analysing the liberation characteristics that occur by means of interparticle breakage. The work includes two parts, firstly the integration of the measured data into a size reduction model, and secondly a reflexion and understanding of the liberation and fracture mechanism during the breakage. Results from the work show that in order to address multi component modelling it is necessary to focus on controlling factors such as dominating quantities of different minerals, breakage mechanism in different bounded minerals and how this is connected with the liberation of them. It also was observed that the model could be used for determining the choice of the compression ratio in crushing for optimising liberation.

  • 130.
    Gunnarsson, Emanuel
    University of Borås, Swedish School of Textiles.
    Textila Kapacitiva Trycksensorer2013Conference paper (Other academic)
  • 131.
    Gunnarsson, Emanuel
    et al.
    University of Borås, Swedish School of Textiles.
    Berglin, Lena
    University of Borås, Swedish School of Textiles.
    Guo, Li
    University of Borås, Swedish School of Textiles.
    Karlsteen, Magnus
    Contact resistance measurements on multifilament silver yarn2010Conference paper (Other academic)
  • 132.
    Guo, L
    et al.
    University of Borås, Swedish School of Textiles.
    Soroudi, A.
    University of Borås, Swedish School of Textiles.
    Berglin, L.
    University of Borås, Swedish School of Textiles.
    Mattila, H.
    University of Borås, Swedish School of Textiles.
    Skrifvars, M.
    University of Borås, School of Engineering.
    Torstensson, H.
    University of Borås, School of Engineering.
    Fibre-based single-wire keyboard: the integration of a flexible tactile sensor into e-textiles2011In: AUTEX Research Journal, ISSN 1470-9589, E-ISSN 2300-0929, Vol. 11, no 4Article in journal (Refereed)
  • 133.
    Guo, Li
    University of Borås, Swedish School of Textiles.
    Smart clothing system for respiratory monitoring: wearability and user acceptance study2014Conference paper (Refereed)
    Abstract [en]

    Functionality, wearability, and user acceptance are critical issues for the development and eventual commercialization of the smart products. The use of smart clothing for medical reasons requires an understanding of the users’ perspective and the willingness to use the products. In this study, a smart clothing system has been developed for respiratory monitoring. Besides the functionality, the wearability from users' perspective has been considered though the design phases. Wearability and user acceptance have been examined by two questionnaires. Results shown the smart clothing system improves comfort and wearability compared with the ordinary respiratory monitoring device and most of the participants believe that using a smart clothing system will improve both health condition and quality of life.

  • 134.
    Guo, Li
    et al.
    University of Borås, Swedish School of Textiles.
    Berglin, Lena
    University of Borås, Swedish School of Textiles.
    Mattila, Heikki
    University of Borås, Swedish School of Textiles.
    Improvement of Electro-Mechanical Properties of Strain Sensors made of elastic-conductive hybrid yarns2012In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 82, no 19, p. 1937-1947Article in journal (Refereed)
    Abstract [en]

    Fabric-based strain sensors have been developed using different technologies, among which flat knitting is one of the most effective and economical methods. However, knitted strain sensors are not often used in practical applications because the sensors usually exhibit large elastic hysteresis when they are deformed and subjected to stress during application. One possible approach to overcome these shortcomings is to introduce elastic properties at the yarn level by combining the conductive materials with elastic materials. In this paper, we demostrate a hybrid yarn made of a conductive yarn that winds around an elastic core yarn in a direct twisting device. The electro-mechanical properties of strain sensors knitted from the hybrid yarns were tested in order to characterize the sensors. This study consisted of two stages: the yarn preparation and the sensor characterization. In the first stage, two kinds of elastic core components (polyamide/Lycra and polyamide) and two kinds of conductive winding yarns (Bekinox BK50/1 and Bekinox BK50/2) were selected for twisting. The twisting was done with a constant twisting speed and four different numbers of twists. Mechanical properties, that is, the tenacity, force at break and elongation at break, were tested in order to determine the optimal parameters for producing the hybrid yarns. The results indicated that among the tested yarns those with a polyamide core and Bekinox BK50/1 winding yarns at 450 twist/meter and with a polyamide/Lycra core and Bekinox BK 50/2 winding yarns at 600 twist/meter had the best properties. These were thus selected as the materials for producing knitted strain sensors. In the second stage, electro-mechanical properties of the knitted strain sensors were determined under tensile stress and multi-cyclic tensile stress. The results show that the hybrid yarns can effectively enhance the

  • 135.
    Guo, Li
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business. Smart textiles .
    Eriksson, Siw
    University of Borås, Faculty of Textiles, Engineering and Business.
    Sandsjö, Leif
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare.
    3D Composite Textile Characteristics Relevant in Pressure Ulcer Management2015Conference paper (Refereed)
    Abstract [en]

    INTRODUCTION

    Effective ulcer management requires the wound to be in a moist but still breathable environment, to facilitate healing, absorb exudates and prevent maceration. One of the applicable methods to achieve this is the use of composite dressings. Most composite dressings are made of three layers to provide absorption and a bacterial barrier in a non- or semi-adherent cover. Various common textile materials such as cotton, polyester, polypropylene and cellulose can be used as different layers in those wound dressings. In addition to these established dressings, electrical stimulation therapy may be used in treating ulcers. It has been reported that electrical stimulation can reduce the area and depth of the wound in a shortened time compared to conventional treatment. In summary, encouraging wound healing results have been obtained both from using composite wound dressing and from applying of electrical stimulation. The aim of this study is to present a conceptual design based on a woven 3D structure that combines the composite wound dressing properties with electrical stimulation for pressure ulcers healing/management.

    METHOD

    In the suggested structure, different layers in X, Y and Z led were designed with different materials for different purposes.  The top layer consisting of a low-density web to provide a non-adherent layer combined with two textile electrodes made of conductive threads, the middle layer contributes pressure release and absorption of exudates, and the bottom layer next to the wound for moisture keeping while still allowing adequate ventilation.

    Two key properties were addressed in the study: pressure release and the possibility to provide electrical stimulation of the wound. Simulation with COMSOL Multiphysics was used to study pressure distribution according to Hertz contact theory. The surface resistance of the electrodes were also studied using in-house designed four-point measurement probes.

    RESULTS

    The simulation results show the composite structure to exhibit good pressure release properties. Surface resistance testing proved that the textile electrodes have resistance in the magnitude of 102 indicating that textile electrodes can be used for electrical stimulation in ulcers healing.

    The first results from this study demonstrate the feasibility to design a textile system combining established composite dressings solutions with means for electrical stimulation based on 3D weaving technique to be applied in pressure ulcer healing. 

  • 136.
    Guo, Li
    et al.
    University of Borås, Swedish School of Textiles.
    Eriksson, Siw
    University of Borås, Swedish School of Textiles.
    Sandsjö, Leif
    University of Borås, School of Engineering.
    Surface Resistivity of Textile-Based Electrodes2014Conference paper (Refereed)
    Abstract [en]

    Textile-based electrodes show great potential as substitution of conventional electrodes when long-time monitoring is required. The flexibility and high skin-electrode contacting area make it possible to avoid the use of contact gel, which may cause irritation to the patients' skin. In this study, textile-based electrodes were made by combining conductive materials with high absorption nature fibres with the intention to create and maintain a microenvironment that improve the contact between the skin and electrode by local sweating at the electrode site. Alternatively artificial sweat (i.e. saline) may be added for a similar effect. However, by adding nature fibres into the electrodes, the electrical properties of the electrodes are modified due to the ration of conductive yarns is decreased. In this paper, the surface resistivity in the warp and weft directions and its distribution were measured in a four-wire resistance mode. The resistivity of the conductive yarns, the type of nature fibres, the textile construction and the fabric pick density were selected as the independent variables and the surface resistivity in warp and weft measurement directions was the dependent variable to be analysed. Preliminary results show that the conductivity of the conductive yarns are more important than the fabric pick density; surface resistance were not measurable in warp direction of most plain weave fabrics since the conductive yarns were only involved in the weft direction, however, the resistance were measureable in the case of satin fabrics; and that the surface resistivity is more evenly distributed in weft direction than the warp direction

  • 137.
    Guo, Li
    et al.
    University of Borås, Swedish School of Textiles.
    Peterson, Joel
    University of Borås, Swedish School of Textiles.
    Qureshi, Waqas
    Kalantar Mehrjerdi, Adib
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Berglin, Lena
    University of Borås, Swedish School of Textiles.
    Knitted Wearable Stretch Sensor for Breathing Monitoring Application2011Conference paper (Refereed)
  • 138. Gällstedt, Mikael
    et al.
    Hedenqvist, Mikael S.
    Olabarrieta, Idoia
    Ullsten, Henrik
    Lindskog, Bo
    Cho, Sung-Woo
    University of Borås, School of Engineering.
    Svensson, Martin
    GluPack: A renewable packaging concept based on wheat gluten2005Conference paper (Other academic)
  • 139.
    Haghighatpanah, Shayesteh
    et al.
    University of Borås, School of Engineering.
    Börjesson, Anders
    Amara, Hakim
    Bichara, Christophe
    Bolton, Kim
    University of Borås, School of Engineering.
    Computational studies of graphene growth mechanisms2012In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 85, no 20Article in journal (Refereed)
    Abstract [en]

    Density functional theory (DFT) and semiempirical tight-binding (TB) methods have been used to study the mechanism of graphene growth in the presence and absence of a catalytic surface. Both DFT and TB geometry optimized structures relevant to graphene growth show that the minimum energy growth mechanism is via the sequential addition of carbon hexagons at the edge of the graphene sheet. Monte Carlo (MC) simulations based on the TB model show that defect-free graphene sheets can be grown provided one has the proper combination of temperature, chemical potential, and addition rate. In this work, growth of perfect graphene structures has been simulated at the atomic level. Comparison of the growth mechanism in the absence and presence of a nickel catalyst surface shows that the catalyst (i) allows for adsorption of carbon atoms at surface and subsurface sites, (ii) enables formation of long, stable strings of carbon atoms, and (iii) stabilizes small flakes of graphene that can act as precursors to subsequent growth.

  • 140.
    Hallnäs, Lars
    et al.
    University of Borås, Swedish School of Textiles.
    Walkenström, PernillaUniversity of Borås, Swedish School of Textiles.Wasling, Lennart
    Ambience08, Proceedings: Smart Textiles- Technology and Design2008Conference proceedings (editor) (Refereed)
  • 141.
    Hashemi Sanatgar, Razieh
    University of Borås, Faculty of Textiles, Engineering and Business.
    FDM 3D printing of conductive polymer nanocomposites: A novel process for functional and smart textiles2019Doctoral thesis, monograph (Other academic)
    Abstract [en]

    The aim of this study is to get the benefitof functionalities of fused deposition modeling(FDM) 3D printed conductive polymer nanocomposites (CPC) for the developmentof functional and smart textiles. 3D printing holds strong potential for the formation of a new class of multifunctional nanocomposites. Therefore, developmentand characterization of 3D printable functional polymers and nanocomposites areneeded to apply 3D printing as a novel process for the depositionof functional materials on fabrics. This method will introduce more flexible, resource-efficient and cost-effectivetextile functionalization processes than conventional printing process like screen and inkjet printing. The goal is to develop an integrated or tailored production process for smart and functional textiles which avoid unnecessary use of water, energy, chemicals and minimize the waste to improve ecological footprint and productivity.

    The contribution of this thesis is the creation and characterization of 3D printable CPC filaments, deposition of polymers and nanocomposites on fabrics, and investigation of the performance of the 3D printed CPC layers in terms of functionality. Firstly, the 3D printable CPC filaments were created including multi-walled carbon nanotubes (MWNT) and high-structured carbon black (Ketjenblack) (KB) incorporated into a biobased polymer, polylactic acid (PLA), using a melt mixing process. The morphological, electrical, thermal and mechanical properties of the 3D printer filaments and 3D printed layers were investigated. Secondly, the performance of the 3D printed CPC layers was analyzed under applied tension and compression force. The response for the corresponding resistance change versus applied load was characterized to investigate the performance of the printed layers in terms of functionality. Lastly, the polymers and nanocomposites were deposited on fabrics using 3D printing and the adhesion of the deposited layers onto the fabrics were investigated.

    The results showed that PLA-based nanocomposites including MWNT and KB are 3D printable. The changes in morphological, electrical, thermal, and mechanical properties of nanocomposites before and after 3D printing give us a great understandingofthe process optimization. Moreover, the results demonstrate PLA/MWNT and PLA/KB as a good piezoresistive feedstock for 3D printing with potential applications in wearable electronics, soft robotics, and prosthetics, where complex design, multi-directionality, and customizability are demanded. Finally, different variables of the 3Dprinting process showed a significanteffect on adhesion force of deposited polymers and nanocomposites onto fabrics which has been presented by the best-fittedmodel for the specific polymer and fabric.

  • 142.
    Hashemi Sanatgar, Razieh
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business. ENSAIT.
    Campagne, Christine
    ENSAIT.
    Nierstrasz, Vincent
    Investigation of the adhesion properties of direct 3D printing of polymers and nanocomposites on textiles: Effect of FDM printing process parameters.2017In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 403, p. 551-563Article in journal (Refereed)
    Abstract [en]

    In this paper, 3D printing as a novel printing process was considered for deposition of polymers on synthetic fabrics to introduce more flexible, resource-efficient and cost effective textile functionalization processes than conventional printing process like screen and inkjet printing. The aim is to develop an integrated or tailored production process for smart and functional textiles which avoid unnecessary use of water, energy, chemicals and minimize the waste to improve ecological footprint and productivity. Adhesion of polymer and nanocomposite layers which were 3D printed directly onto the textile fabrics using fused deposition modeling (FDM) technique was investigated. Different variables which may affect the adhesion properties including 3D printing process parameters, fabric type and filler type incorporated in polymer were considered. A rectangular shape according to the peeling standard was designed as 3D computer-aided design (CAD) to find out the effect of the different variables. The polymers were printed in different series of experimental design: nylon on polyamide 66 (PA66) fabrics, polylactic acid (PLA) on PA66 fabric, PLA on PLA fabric, and finally nanosize carbon black/PLA (CB/PLA) and multi-wall carbon nanotubes/PLA (CNT/PLA) nanocomposites on PLA fabrics. The adhesion forces were quantified using the innovative sample preparing method combining with the peeling standard method. Results showed that different variables of 3D printing process like extruder temperature, platform temperature and printing speed can have significant effect on adhesion force of polymers to fabrics while direct 3D printing. A model was proposed specifically for deposition of a commercial 3D printer Nylon filament on PA66 fabrics. In the following, among the printed polymers, PLA and its composites had high adhesion force to PLA fabrics.

  • 143.
    Hatamvand, Mohammad
    et al.
    Yazd University.
    Abbas Mirjalili, Seyed
    Yazd University.
    Fattahi, Saeid
    Yazd University.
    Bashir, Tariq
    Yazd University.
    Skrifvars, Mikael
    University of Borås, Faculty of Textiles, Engineering and Business.
    Optimum Drafting Conditions of Polyester and Viscose Blend Yarns2017In: AUTEX Research Journal, ISSN 1470-9589, E-ISSN 2300-0929Article in journal (Refereed)
    Abstract [en]

    In this study, we used an experimental design to investigate the  influence of the total draft, break draft, distance between the aprons (Clips) and production roller pressure on yarn quality in order to obtain optimum drafting conditions for polyester and viscose (PES/CV) blend yarns in ring spinning frame. We used PES fibers (1.4 dtex × 38 mm long) and CV fibers (1.6 dtex × 38 mm long) to spin a 20 Tex blend yarn of PES (70%)/CV (30%) blend ratio. When the break draft, adjustment of distance between of aprons and roller pressure is not reasonable, controlling and leading of the fibers is not sufficient for proper orientation of the fibers in the yarn structure to produce a high quality yarn. Experimental results and statistical analysis show that the best yarn quality will be obtained under drafting conditions total draft of 38, 1.2 break draft, 2.8 mm distance between of aprons and maximum pressure of the production top roller (18daN).

  • 144. Hooshmand, S.
    et al.
    Cho, S-W.
    University of Borås, School of Engineering.
    Skrifvars, M.
    University of Borås, School of Engineering.
    Mathew, A.P.
    Oksdamn, K.
    Preparation of bio-nanocomposite fibers by melt spinning of cellulose acetate butyrate (CAB) and cellulose nanowhiskers (CNW)2012Conference paper (Other academic)
  • 145. Hooshmand, Saleh
    et al.
    Aitomäki, Yvonne
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Mathew, Ali
    Oksman, Kristiina
    All-cellulose nanocomposite fibers produced by melt spinning cellulose acetate butyrate and cellulose nanocrystals2014In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 21, no 4, p. 2665-2678Article in journal (Refereed)
    Abstract [en]

    Bio-based continuous fibers were prepared by melt spinning cellulose acetate butyrate (CAB), cellulose nanocrystals (CNC) and triethyl citrate. A CNC organo-gel dispersion technique was used and the prepared materials (2 and 10 wt% CNC) were melt spun using a twin-screw micro-compounder and drawn to a ratio of 1.5. The microscopy studies showed that the addition of CNC in CAB resulted in defect-free and smooth fiber surfaces. An addition of 10 wt% CNC enhanced the storage modulus and increased the tensile strength and Young’s modulus. Fiber drawing improved the mechanical properties further. In addition, a micromechanical model of the composite material was used to estimate the stiffness and showed that theoretical values were exceeded for the lower concentration of CNC but not reached for the higher concentration. In conclusion, this dispersion technique combined with melt spinning can be used to produce all-cellulose nanocomposites fibers and that both the increase in CNC volume fraction and the fiber drawing increased the mechanical performance.

  • 146. Hooshmand, Saleh
    et al.
    Cho, Sung-Woo
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Mathew, Ali
    Oksman, Kristiina
    Melt spun cellulose nanocomposite fibres: Comparison of two dispersion techniques2014In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 43, no 1, p. 15-24Article in journal (Refereed)
    Abstract [en]

    Biobased fibres of cellulose acetate butyrate (CAB) and cellulose nanocrystals (CNC) and triethyl citrate (TEC) as plasticiser were prepared by melt spinning. To obtain homogeneous dispersion of CNC, two different dispersion techniques were studied. In the first, the water content of the CNC suspension was reduced and exchanged to ethanol using centrifugation. In the second, the water in the CNC suspension was completely exchanged to ethanol by sol–gel process. Results showed that tensile modulus and tensile strength of the nanocomposite fibres produced with the first technique were lower than CAB–TEC fibres, but the fibres produced by the sol–gel process showed an increase in the tensile modulus and had no decrease in the strength. Optical microscopy of the fibres indicated a few aggregations on the sol–gel prepared materials. The results indicate that the sol–gel process is enhancing the dispersion of CNC and can be a suitable way to prepare nanocomposite fibres.

  • 147. Hooshmand, Saleh
    et al.
    Soroudi, Azadeh
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Electroconductive composite fibers by melt spinning of polypropylene/polyamide/carbon nanotubes2011In: Synthetic metals, ISSN 0379-6779, E-ISSN 1879-3290, Vol. 161, no 15-16, p. 1731-1737Article in journal (Refereed)
    Abstract [en]

    In this study, the blends of polypropylene/polyamide with carbon nanotubes (CNTs) have been prepared and melt spun to as-spun and drawn fibers. Thermal analysis showed that increasing the polyamide content, decreased the degree of crystallinity in the blends. Characterization of fibers showed that both conductivity and tensile strength have been improved by increasing the amount of polyamide in the blends as well as the melt blending temperature; furthermore, the morphology, electrical and mechanical properties of the blends were significantly influenced by adding 1 phr compatibilizer to the blend. The comparison between as-spun fibers and drawn fibers proved that although mechanical properties were improved after drawing, the electrical conductivity was decreased from the order of E−02 to E−06 (S/cm), due to applied draw-ratio of three.

  • 148. Hooshmand, Saleh
    et al.
    Soroudi, Azadeh
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Preparation of conductive composite fibers made from polypropylene, polyamide and multi-walled carbon nanotubes: electrical, mechanical and thermal characteristics2011Conference paper (Refereed)
  • 149.
    Huang, Meiyuan
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Guu, Annie
    University of Borås, Faculty of Textiles, Engineering and Business.
    A study of consumer perception of a Chinese luxury fashion apparel brand in Sweden2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis investigates consumer perceptions of a Chinese luxury fashion brand in Sweden. The impact of nation brand image in terms of consumer buying behaviour and perception is examined by performing a case study of Shanghai Tang, comparing it to the American luxury fashion brand Ralph Lauren through the brands’ country of origin and brand history. Then a questionnaire is developed to analyse the luxury consumers’ perception of the Chinese brand Shanghai Tang and calculate the probability of customers purchasing luxury goods by Shanghai Tang. Finally, the future of Chinese luxury in Sweden will be discussed through an in-depth interview.

  • 150.
    Huniade, Claude
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Mulder, Roos
    University of Borås, Faculty of Textiles, Engineering and Business.
    Milad, Asadi Miankafshe
    University of Borås, Faculty of Textiles, Engineering and Business.
    Bashir, Tariq
    University of Borås, Faculty of Textiles, Engineering and Business.
    Persson, Nils-Krister
    University of Borås, Faculty of Textiles, Engineering and Business.
    Disposable, green smart textiles based on conductive graphite fibres2019Conference paper (Other academic)
    Abstract [en]

    Smart textiles, a part of the present boom of wearables, is at the risk of being a newenvironmental problem as many axioms of sustainability are violated here, that of driving(mass) consumption, mixing of components of different material origin and no obvious wastehandling system when used and worn out. Smartness has been synonymous with integration ofelectronic conductivity functionality, typically realised by metal wires. Carbon allomorphsshowing low electrical resistivity might be an environmental friendly alternative.

    Here we report on attempts with simple conductive graphite systems from which we makeconductive textile fibres, the production of which could be up-scaled to industrial volumes.Coating textile bulk fibers as polyester, polyamide, wool and cellulose based regenerate onesrather than (melt/wet) spinning new fibers, the mechanical properties are sustained makingthem processable within existing textile processes infrastructure.

    Several different graphite compositions and different yarn topologies are compared. Twisting isshown to greatly increase the overall yarn conductance. Fabrics are manufactured with thegraphite yarns in the double role of being structural as well as functional. Furthermore, analphabet of fundamental electrical circuitry elements are demonstrated; conductor, capacitor,inductor. The devices are consisting of non-toxic components that are disposable andcompostable; showing the benefits of carbon based soft electronics.

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