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Skrifvars, Mikael
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Publications (10 of 239) Show all publications
Kumar Ramamoorthy, S., Åkesson, D., Skrifvars, M., Rajan, R. & Periyasamy, A. P. (2019). Mechanical performance of biofibers and their corresponding composites. In: Mohammad Jawaid, Mohamed Thariq, Naheed Saba (Ed.), Mechanical and Physical Testing of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites: . Woodhead Publishing Limited
Open this publication in new window or tab >>Mechanical performance of biofibers and their corresponding composites
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2019 (English)In: Mechanical and Physical Testing of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites / [ed] Mohammad Jawaid, Mohamed Thariq, Naheed Saba, Woodhead Publishing Limited, 2019Chapter in book (Refereed)
Abstract [en]

This chapter focuses on mechanical performance of biofibers such as flax, hemp, and sisal and their effect on mechanical performance when they are reinforced in thermoset and thermoplastic polymers. The aim of this chapter is to present an overview of the mechanical characterization of the biofibers and their corresponding composites. The mechanical characterization includes tensile, flexural, impact, compressive, shear, toughness, hardness, brittleness, ductility, creep, fatigue, and dynamic mechanical analyses. Detailed studies of each test have been widely reported and an overview is important to relate the studies. Studies pertaining to the topics are cited. The most common materials used in biocomposites are biofibers (also called natural fibers) and petroleum-based polymers such polypropylene. The use of renewable materials in biocomposites has increased in the past couple of decades owing to extensive research on cellulosic fibers and biopolymers based on starch or vegetable oil. Today, research is focused on reinforcing natural fibers in petroleum-based polymers. However, the emphasis is shifting toward the amount of renewable materials in biocomposites, which has led to the use of biopolymers instead of petroleum-based polymers in composites. The mechanical properties of some renewable resource-based composites are comparable to commercially available nonrenewable composites.

Several plant biofibers have been reinforced in thermoplastics or thermosets to manufacture biocomposites because of their specific properties. The Young's modulus of commonly used biofibers such as hemp and flax could be over 50 GPa and therefore they could be good alternatives to glass fibers in several applications. The good mechanical properties of these biofibers influence the composites' mechanical performance when reinforced in polymers. It is important to understand the mechanical performance of these biofibers and biocomposites in a working environment. A detailed discussion about the mechanical performance of commonly used biofibers and composites is provided in this chapter.

Place, publisher, year, edition, pages
Woodhead Publishing Limited, 2019
Keywords
Biocomposite, Biofiber, Mechanical properties, Natural fiber, Renewable materials
National Category
Polymer Technologies Textile, Rubber and Polymeric Materials Other Mechanical Engineering
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-15228 (URN)10.1016/B978-0-08-102292-4.00014-X (DOI)
Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2018-11-16Bibliographically approved
Vogt, S., Baghaei, B., Kadi, N. & Skrifvars, M. (2018). Determination of Processing Parameters for Thermoplastic Biocomposites Based on Hybrid Yarns Using Finite Elements Simulation. Journal of Composites Science, 2(1)
Open this publication in new window or tab >>Determination of Processing Parameters for Thermoplastic Biocomposites Based on Hybrid Yarns Using Finite Elements Simulation
2018 (English)In: Journal of Composites Science, ISSN 2504-477X, Vol. 2, no 1Article in journal (Refereed) Published
Abstract [en]

This paper investigates the processing parameters for the compression molding of hemp/PLA hybrid yarn biocomposites and their effect on the final mechanical properties. Finite element simulations are used to develop and assess the processing parameters, pressure, temperature, and time. These parameters are then evaluated experimentally by producing the composites by two different methods, to compare the results of experimentally determined processing conditions to parameters determined by the simulation analysis. The assessment of mechanical properties is done with several experimental tests, showing small improvements for the composites produced with the simulation method. The application of the simulation analysis results in considerably reduced processing times, from the initial 10 min to only three minutes, thereby vastly improving the processing method. While the employed methods are not yet able to produce composites with greatly improved mechanical properties, this study can be seen as a constructive approach, which has the ability to lead to further improvements.

Keywords
fabrics/textiles, mechanical properties, porosity/voids, finite element analysis (FEA)
National Category
Engineering and Technology
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-13783 (URN)10.3390/jcs2010011 (DOI)
Available from: 2018-03-05 Created: 2018-03-05 Last updated: 2018-03-12Bibliographically approved
Temmink, R., Baghaei, B. & Skrifvars, M. (2018). Development of biocomposites from denim waste and thermoset bio-resins. Composites. Part A, Applied science and manufacturing, 106, 59-69
Open this publication in new window or tab >>Development of biocomposites from denim waste and thermoset bio-resins
2018 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 106, p. 59-69Article in journal (Refereed) Published
Abstract [en]

This paper examines the use of post-consumer denim fabric in combination with thermoset bio-resins in composite manufacturing for structural applications. Bio-epoxy and acrylated epoxidized soybean oil resin (AESO) were used as bio-resins with four different manufacturing techniques in order to create a wide scope of possibilities for research. The four techniques are: compression moulding (COM), vacuum infusion (VAC), resin transfer moulding (RTM) and hand lay-up (HND). The bio-resins were compared to a conventional polyester resin, as this is highly used for structural applications. To determine suitability for structural applications, the biocomposites were tested for their mechanical and thermal properties. Fabricated composites were characterised regarding porosity, water absorption and analysed through microscopic images of the composite. Results show both bio-epoxy and AESO are suitable for use in structural applications over a range of manufacturing techniques. Furthermore, biocomposites from bio-epoxy are superior to those from AESO resin. The conventional polyester has shown to be unsuitable for structural applications.

Keywords
Biocomposites, Recycling, Mechanical properties, Resin transfer moulding
National Category
Composite Science and Engineering
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-13450 (URN)10.1016/j.compositesa.2017.12.011 (DOI)2-s2.0-85038215194 (Scopus ID)
Available from: 2018-01-14 Created: 2018-01-14 Last updated: 2018-01-16Bibliographically approved
Kumar Ramamoorthy, S., Skrifvars, M., Rajan, R., Rainosalo, E., Thomas, S., Zavasnik, J. & Vuorinen, J. (2018). Mechanical, thermal, and burning properties of viscose fabric composites: Influence of epoxy resin modification. Journal of Applied Polymer Science, 135(36)
Open this publication in new window or tab >>Mechanical, thermal, and burning properties of viscose fabric composites: Influence of epoxy resin modification
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2018 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 135, no 36Article in journal (Refereed) Published
Abstract [en]

The influence of epoxy resin modification by 3-aminopropyltriethoxysilane (APTES) on various properties of warp knitted viscose fabric is reported in this study. Dynamic mechanical, impact resistance, flexural, thermal properties, and burning behavior of the epoxy/viscose fabric composites are studied with respect to varying content of silane coupling agent. The results obtained forAPTES-modified epoxy resin based composites reinforced with unmodified viscose fabric composites are compared to unmodified epoxy resin based composites reinforced with APTES-modified viscose fabric. The dynamic mechanical behavior of the APTES-modified resin based composites indicates improved interfacial adhesion. The composites prepared from modified epoxy resin exhibited a twofold increase in impact resistance. The improved adhesion between the fiber and modified resin was also visible from the scanning electron microscope analysis of the impact fracture surface. There was less influence of resin modification on the flexural properties of the composites. The 5% APTES modification induced early degradation of composites compared to all other compo-sites. The burning rate of all the composites under study is rated to be satisfactory for use in automotive interior applications.

Keywords
cellulose and other wood products, functionalization of polymers, mechanical properties, thermal properties, thermosets
National Category
Textile, Rubber and Polymeric Materials Polymer Technologies
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-15227 (URN)10.1002/app.46673 (DOI)
Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2018-11-16Bibliographically approved
Rajan, R., Rainosalo, E., Thomas, S., Kumar Ramamoorthy, S., Vuorinen, J., Skrifvars, M. & Zavasnik, J. (2018). Modification of epoxy resin by silane-coupling agent to improve tensile properties of viscose fabric composites. Polymer Bulletin, 75(1), 167-195
Open this publication in new window or tab >>Modification of epoxy resin by silane-coupling agent to improve tensile properties of viscose fabric composites
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2018 (English)In: Polymer Bulletin, ISSN 0170-0839, E-ISSN 1436-2449, Vol. 75, no 1, p. 167-195Article in journal (Refereed) Published
Abstract [en]

The modification of epoxy resin by 3-aminopropyltriethoxysilane (APTES) to improve the tensile properties of warp knitted viscose fabric composites is reported in this study. The study evaluates the efficiency of modification methods adopted to modify the epoxy resin and the influence of the resin modification on various properties of the cured castings. The influence of matrix resin modification on the tensile properties of viscose fabric composite is compared to those prepared from chemically modified fibre. The efficiency of the modification was determined through titration method to determine the epoxide content of epoxy resin, viscosity measurement and FTIR. The effect of APTES modification on various properties of cured castings is studied through differential scanning calorimeter, contact angle measurement and tensile testing. The addition of APTES into the epoxy resin decreased the epoxide content in the resin as evident from the titration method. The tensile strength of cured castings decreased after the resin modification. The tensile strength and elongation at break of the viscose fabric composites prepared from modified resin, increased up to 14 and 41%, respectively. The improved adhesion of APTES-modified epoxy resin to the viscose fibre is confirmed from SEM analysis of tensile fracture surface.

Keywords
APTES, Composites, Epoxy, Modification, Regenerated cellulose, Silane coupling agent, Tensile, Viscose
National Category
Composite Science and Engineering
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-13449 (URN)10.1007/s00289-017-2022-2 (DOI)
Available from: 2018-01-14 Created: 2018-01-14 Last updated: 2018-01-15Bibliographically approved
Kadi, N., Muhandes, H., Kalácska, G. & Skrifvars, M. (Eds.). (2018). Pin-on-Plate Abrasive Wear Test For Several Composite Materials. Paper presented at The Eighteenth International Conference of Experimental Mechanics (ICEM), Brussels, 1-5 July, 2018. MPDI
Open this publication in new window or tab >>Pin-on-Plate Abrasive Wear Test For Several Composite Materials
2018 (English)Conference proceedings (editor) (Refereed)
Place, publisher, year, edition, pages
MPDI, 2018
National Category
Engineering and Technology
Research subject
Textiles and Fashion (General); Resource Recovery
Identifiers
urn:nbn:se:hb:diva-14752 (URN)10.3390/ICEM18-05333 (DOI)
Conference
The Eighteenth International Conference of Experimental Mechanics (ICEM), Brussels, 1-5 July, 2018
Available from: 2018-07-12 Created: 2018-07-12 Last updated: 2018-07-30Bibliographically approved
Kadi, N., Baghaei, B. & Skrifvars, M. (2018). Using Finite Element Simulation to Optimize Thermoplastic Bio - Composites Process Parameters. In: : . Paper presented at 115th The IRES International Conference, Medina, 15-16 May, 2018. World Research Library
Open this publication in new window or tab >>Using Finite Element Simulation to Optimize Thermoplastic Bio - Composites Process Parameters
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The use of thermoplastic composite is clearly of higher potential because of: good impact strength, easier recycling, faster processing conditions (no time for curing is required), possibility of production in longer series, lower cost, absence of toxic solvents and higher fracture toughness and elongation on the fracture. Natural fibres today are a popular choice for applications in composite manufacturing. In fact, a major challenge for natural fibre reinforced composites is to achieve high mechanical performance at competitive prices. This paper investigates the processing parameters for the compression moulding of hemp/PLA hybrid yarn bio-composites and their effect on the final mechanical properties. Finite element simulations are used to develop and assess the processing parameters pressure, temperature, and time. The application of the simulation analysis results in considerably reduced the processing times from initially 10 minutes to only 2 minutes, and improved the mechanical bio-composite

Place, publisher, year, edition, pages
World Research Library, 2018
Series
THE IRES 115th INTERNATIONAL CONFERENCE
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hb:diva-14751 (URN)
Conference
115th The IRES International Conference, Medina, 15-16 May, 2018
Available from: 2018-07-12 Created: 2018-07-12 Last updated: 2018-07-13Bibliographically approved
Asadi, M., Bashir, T. & Skrifvars, M. (2017). Development of eco-friendly flame retardant polypropylene fibers. In: : . Paper presented at Fiber Society International Conference, Aachen Germany, May 17–19, 2017. Aachen, Germany
Open this publication in new window or tab >>Development of eco-friendly flame retardant polypropylene fibers
2017 (English)Conference paper, Poster (with or without abstract) (Refereed)
Place, publisher, year, edition, pages
Aachen, Germany: , 2017
Keywords
Polypropylene, eco-friendly, flame retardant, melt spinning
National Category
Textile, Rubber and Polymeric Materials
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-13430 (URN)
Conference
Fiber Society International Conference, Aachen Germany, May 17–19, 2017
Available from: 2018-01-13 Created: 2018-01-13 Last updated: 2018-01-15Bibliographically approved
Kalantar Mehrjerdi, A., Naudin, S. & Skrifvars, M. (2017). Development of Polyolefin Compound and Post-Polymerization Treatments for Ground Heat Exchangers. In: : . Paper presented at IGSHPA Technical/Research Conference and Expo, Devner, March 14-16, 2017.
Open this publication in new window or tab >>Development of Polyolefin Compound and Post-Polymerization Treatments for Ground Heat Exchangers
2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

A ground source heat pump (GSHP) system can be used for both cooling and heating modes simultaneously for commercial, industrial and residential buildings virtually at any location with great flexibility to cover a wide range of demands all around the world. Polyethylene (PE) has been used as the main raw material in production of the Ground Heat Exchangers (GHE). This paper briefly reviews the history of polyethylene and development in polymerization process with emphasis on the third-generation bimodal structure. The characteristics of PE pipes used in GSHP systems are discussed. This paper is devoted to a critical review on the attempts in post-polymerization treatments of the PE, and GHEs to improve the performance of the systems. The experimental and simulated comparisons show that the enhancement of the thermal conductivity of the material can reduce significantly the overall borehole thermal resistance.

National Category
Mechanical Engineering
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-12107 (URN)10.22488/okstate.17.000534 (DOI)
Conference
IGSHPA Technical/Research Conference and Expo, Devner, March 14-16, 2017
Available from: 2017-04-18 Created: 2017-04-18 Last updated: 2017-05-03Bibliographically approved
Skrifvars, M., Pal, J., Srivastava, R. K. & Nandan, B. (2017). Electrospun composite matrices from tenside-free poly(caprolactone)-grafted acrylic acid/hydroxyapatite oil-in-water emulsions. Journal of Materials Science, 52(4), 2254-2262
Open this publication in new window or tab >>Electrospun composite matrices from tenside-free poly(caprolactone)-grafted acrylic acid/hydroxyapatite oil-in-water emulsions
2017 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 52, no 4, p. 2254-2262Article in journal (Refereed) Published
Abstract [en]

Composite matrices of poly(ε-caprolactone)-grafted acrylic acid (PCL-g-AA) and hydroxyapatite (HA) were prepared via electrospinning of oil-in-water emulsions. Grafting of varying amounts of AA on PCL was carried out in a twin-screw compounder using benzoyl peroxide as an initiator under inert atmosphere. A solution of PCL-g-AA in toluene, containing HA, comprised the oil phase of the emulsion, while the aqueous phase contained poly(vinyl alcohol) (PVA) as a template polymer. No emulsifier was used in making such emulsions which were found to be stable for more than a month at room temperature. Secondary interactions of AA group of PCL-g-AA with HA and PVA at the oil–water interface provided stability to the emulsion. Uniform composite fibrous matrices were produced from the resultant emulsions under controlled electrospinning conditions. The composite matrices, thus developed using minimal organic solvent, are free from emulsifiers and have high potential to be used in applications including tissue engineering

Keywords
Electrospinning, hydroxyapatite, polycaprolactone, copolymer
National Category
Polymer Technologies
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-11605 (URN)10.1007/s10853-016-0518-z (DOI)000389409400039 ()2-s2.0-84992363270 (Scopus ID)
Funder
The Swedish Foundation for International Cooperation in Research and Higher Education (STINT), IB 2014-5638
Available from: 2017-01-04 Created: 2017-01-04 Last updated: 2017-11-29Bibliographically approved
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