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  • 1. Engström, Jonas
    et al.
    Thorvaldsson, Anna
    Hagström, Bengt
    Walkenström, Pernilla
    University of Borås, Swedish School of Textiles.
    Nanofibers: small fibers with big potential2009In: Nordic Textile Journal, ISSN 1404-2487Article in journal (Other academic)
  • 2.
    Hallnäs, Lars
    et al.
    University of Borås, Swedish School of Textiles.
    Redström, Johan
    Walkenström, Pernilla
    University of Borås, Swedish School of Textiles.
    Smart Textiles2008Report (Other academic)
  • 3.
    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)
  • 4.
    Malm, Veronica
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Walkenström, Pernilla
    University of Borås, Faculty of Textiles, Engineering and Business. Swerea IVF, Department of Textile and Plastics.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Flexible and durable highly conductive coatings for smart textile applications2015In: Bio-Boosting Today's Technology, 2015, p. 1-199Conference paper (Other academic)
    Abstract [en]

    The aim of this research is to develop highly conductive coating compounds for the emergence of comfortable and durable garments with integrated technology. Metals as filler particles for coating and printing pastes are the focus in this work. This, due to that metal provides excellent conductive properties particularly important for producing reliable electronic circuits used in e.g. wearable body monitoring systems. The research presented center on the frequently reported research challenges; to overcome the stiffening effects of metals and the poor mechanical resistance of the conductive film, commonly shown during folding, abrasion and washing [1,2]. This affects the comfort for the wearer and the durability. A prior concern is also the toxicological effects of certain metal particles, possibly leaking out into the environment during washing or wearing. Therefore the mechanical resistance and adhesion of these types of coatings are further investigated.

    Today, the use of metal compounds for flexible electronic fabrics are frequently reported including their use for electromagnetic shielding and even antimicrobial effects [3]. In this work, conductive coatings containing silver-coated copper flakes are evaluated for their electrically and thermally conductive properties, using square resistance measurements and infrared camera imaging respectively. Different approaches for improving the durability of the conductive films are comprised, such as addition of a cross-linking agent and encapsulation of the conductive film.

  • 5. Nelvig, Anna
    et al.
    Engström, Jonas
    Hagström, Bengt
    Walkenström, Pernilla
    Nanofibers in technical textiles2007In: The Nordic Textile Journal 2006-07, p. 90-99Article in journal (Other academic)
  • 6. Walkenström, Pernilla
    et al.
    Thorvaldsson, Anna
    Electrospinning of nanofibers for biomedical applications2008In: The Nordic Textile Journal 2008, Special Edition Smart Textiles, p. 22-29Article in journal (Other (popular science, discussion, etc.))
  • 7.
    Åkerfeldt, Maria
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business. Swerea IVF AB, Materials department, Mölndal, Sweden.
    Lund, Anja
    University of Borås, Faculty of Textiles, Engineering and Business.
    Walkenström, Pernilla
    Swerea IVF AB, Materials department, Mölndal, Sweden.
    Textile sensing glove with piezoelectric PVDF fibers and printed electrodes of PEDOT:PSS2015In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 85, no 17, p. 1789-1799Article in journal (Refereed)
  • 8.
    Åkerfeldt, Maria
    et al.
    University of Borås, Swedish School of Textiles.
    Nilsson, Erik
    Gillgard, Philip
    Walkenström, Pernilla
    University of Borås, Swedish School of Textiles.
    Textile piezoelectric sensors: melt spun bi-component poly(vinylidene fluoride) fibres with conductive cores and poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) coating as the outer electrode2014In: Fashion and Textiles, ISSN 2198-0802, Vol. 1, no 13Article in journal (Refereed)
    Abstract [en]

    The work presented here addresses the outer electroding of a fully textile piezoelectric strain sensor, consisting of bi-component fibre yarns of β-crystalline poly(vinylidene fluoride) (PVDF) sheath and conductive high density polyethylene (HDPE)/carbon black (CB) core as insertions in a woven textile, with conductive poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) coatings developed for textile applications. Two coatings, one with a polyurethane binder and one without, were compared for the application and evaluated as electrode material in piezoelectric testing, as well as tested for surface resistivity, tear strength, abrasion resistance and shear flexing. Both coatings served their function as the outer electrodes in the system and no difference in this regard was detected between them. Omission of the binder resulted in a surface resistivity one order of magnitude less, of 12.3 Ω/square, but the surface resistivity of these samples increased more upon abrasion than the samples coated with binder. The tear strength of the textile coated with binder decreased with one third compared to the uncoated substrate, whereas the tear strength of the coated textile without binder increased with the same amount. Surface resistivity measurements and scanning electron microscopy (SEM) images of the samples subjected to shear flexing showed that the coatings without the binder did not withstand this treatment, and that the samples with the binder managed this to a greater extent. In summary, both of the PEDOT:PSS coatings could be used as outer electrodes of the piezoelectric fibres, but inclusion of binder was found necessary for the durability of the coating.

  • 9.
    Åkerfeldt, Maria
    et al.
    University of Borås, Swedish School of Textiles.
    Strååt, Martin
    Walkenström, Pernilla
    University of Borås, Swedish School of Textiles.
    Electrically conductive textile coating with a PEDOT-PSS dispersion and a polyurethane binder2013In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 83, no 6, p. 618-627Article in journal (Refereed)
    Abstract [en]

    Electrically conductive textile coatings have been prepared by the addition of a dispersion of poly(3,4-ethylenedioxy thiophene)-polystyrene sulfonate (PEDOT-PSS) and ethylene glycol to a polyurethane-based coating formulation. The formulations were designed to have similar viscosities, measured with a rheometer using a cone-and-plate set-up. The formulations were applied to woven poly(ethylene) terephthalate substrates using a direct coating method. The concentration PEDOT-PSS in the finished coatings varied between 0.7 and 6.2 wt%, the coating deposit between 19 and 155 g/m2 and the drying procedure between 4 hours at 20 C and 10 minutes at 150 C. Surface resistivity was measured with a ring probe and surface topology was addressed with scanning electron microscopy (SEM). The PEDOT-PSS concentration had a large effect on the resistivity, which dropped by five orders of magnitude with an increased concentration. The steepest decrease occurred between 1 and 3 wt% PEDOT-PSS, indicating a percolation threshold. An increased coating deposit resulted in a resistivity drop by a factor 10, but no significant effect on the resistivity of the samples could be ascertained by variation of the drying conditions when samples had been subjected to subsequent annealing.

  • 10.
    Åkerfeldt, Maria
    et al.
    University of Borås, Swedish School of Textiles.
    Strååt, Martin
    Walkenström, Pernilla
    University of Borås, Swedish School of Textiles.
    Influence of coating parameters on textile and electrical properties of a poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)/polyurethane-coated textile2013In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 83, no 20, p. 1-13Article in journal (Refereed)
    Abstract [en]

    Textile coatings with electrical conductivity were obtained by the addition of poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) and ethylene glycol (EG) to a polyurethane (PU)-based coating formulation. Variations of the coating formulation, the coating amount and the drying conditions, as well as the absence of an annealing step, were investigated. The coated fabrics were evaluated for tear strength and bending rigidity as well as surface resistivity and appearance before and after Martindale abrasion. A high proportion of PEDOT:PSS dispersion in the formulation and the presence of EG provided low surface resistivity. This composition resulted in softer samples with higher tear strength than those containing more PU-binder. All coatings proved to withstand abrasion to a similar extent. The surface resistivity increased gradually with the abrasion, about one half order of magnitude, except for those coatings that had been subjected to a faster drying process, where the surface resistivity increased somewhat faster.

  • 11.
    Åkesson, Dan
    et al.
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Hagström, Bengt
    Walkenström, Pernilla
    University of Borås, Swedish School of Textiles.
    Seppälä, Jukka
    Processing of Structural Composites from Biobased Thermoset Resins and Natural Fibres by Compression Moulding2008In: Journal of Biobased Materials and Bioenergy, ISSN 1556-6560, E-ISSN 1556-6579, Vol. 3, no 3, p. 215-225Article in journal (Refereed)
    Abstract [en]

    With the aim of producing composites from renewable materials for the furniture industry, a number of thermoset prepregs were manufactured and evaluated. The applicability of two different biobased thermoset resins was evaluated. The first resin is based on soybean oil and the second on lactic acid. Both resins are cross-linkable and produced from renewable resources. Prepregs were manufactured from the two resins together with natural fibres (flax and cellulose). Furthermore, sheet moulding compound (SMC) was developed from lactic acid based resin together with glass fibre. Seat shells were produced from the prepregs by compression moulding. Curing of the composites was monitored using a response surface methodology. Further, the fibre ratio, mechanical properties as well as adhesion between the matrix and the fibre were evaluated. These prepregs offers short cycle times and yield products with suitable mechanical properties. Issues related to the preparation and the processing of the prepregs are discussed in the article.

  • 12.
    Åkesson, Dan
    et al.
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Seppälä, Jukka V.
    Walkenström, Pernilla
    University of Borås, Swedish School of Textiles.
    Preparation of Natural Fibre Composites from Biobased Thermoset Resins.2006Conference paper (Refereed)
  • 13.
    Åkesson, Dan
    et al.
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Walkenström, P.
    University of Borås, Swedish School of Textiles.
    Preparation of thermoset composites from natural fibres and acrylate modified soybean oil resins2009In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 114, no 4, p. 2502-2508Article in journal (Refereed)
    Abstract [en]

    Structural composites with a high content of renewable material were produced from natural fibres and an acrylated epoxidized soybean oil resin. Composites were prepared by spray impregnation followed by compression moulding at elevated temperature. The resulting composites good mechanical properties in terms of tensile strength flexural strength. Tensile testing as well as dynamical :hanical thermal analysis showed that increasing the e content, increased the mechanical properties. The resin be reinforced with up to 70 wt % fibre without sacrifice in processability. The tensile modulus ranged between 5.8 and 9.7 GPa depending on the type of fibre mat. The study of the adhesion by low vacuum scanning electron microscopy shows that the fibres are well impregnated in the matrix. The aging properties were finally evaluated. This study shows that composites with a very high content of renewable constituents can be produced from soy bean oil resins and natural fibres.

1 - 13 of 13
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