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Flexible strength-improved and crack-resistant biocomposites based on plasticised wheat gluten reinforced with a flax-fibre-weave
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-7674-0262
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
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2017 (English)In: Composites Part A: Applied Science and Manufacturing, ISSN 1359-835X, Vol. 94, p. 61-69Article in journal (Refereed) Published
Abstract [en]

This paper presents strength-improved and crack-resistant wheat gluten biocomposites, using flax-fibre-weaves as reinforcement. The composites were produced by dip-coating of the weave into a wheat gluten/glycerol (WGG) solution, or by compression moulding. The most extensive coverage and wetting of the flax yarns occurred during the compression moulding, and the adhesion between the fibres and the matrix increased with increasing glycerol content. The compression-moulded sheets were, at a comparable flax content, stiffer than those produced by dipping, whereas their strength was similar and their extensibility slightly lower. Tensile tests on notched samples showed that the flax yarn improved the crack-resistant properties significantly; the maximum stress increased from 2 to 29 MPa using a content of 19 wt.% flax fibres. A clear advantage of this novel mechanically flexible biocomposite is that it can be shaped plastically under ambient conditions, while at the same time providing in-plane stiffness, strength and crack-resistance.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 94, p. 61-69
Keywords [en]
A. Biocomposites, A. Fibres, B. Fracture toughness, B. Mechanical properties
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-200890DOI: 10.1016/j.compositesa.2016.12.016ISI: 000394193300007Scopus ID: 2-s2.0-85007227713OAI: oai:DiVA.org:kth-200890DiVA, id: diva2:1071093
Note

QC 20170203

Available from: 2017-02-03 Created: 2017-02-03 Last updated: 2017-05-29Bibliographically approved
In thesis
1. Biofoams and Biocomposites based on Wheat Gluten Proteins
Open this publication in new window or tab >>Biofoams and Biocomposites based on Wheat Gluten Proteins
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Novel uses of wheat gluten (WG) proteins, obtained e.g. as a coproduct from bio-ethanol production, are presented in this thesis. A flame-retardant foam was prepared via in-situ polymerization of hydrolyzed tetraethyl orthosilicate (TEOS) in a denatured WG matrix (Paper I). The TEOS formed a well-dispersed silica phase in the walls of the foam. With silica contents ≥ 6.7 wt%, the foams showed excellent fire resistance. An aspect of the bio-based foams was their high sensitivity to fungi and bacterial growth. This was addressed in Paper II using a natural antimicrobial agent Lanasol. In the same paper, a swelling of 32 times its initial weight in water was observed for the pristine WG foam and both capillary effects and cell wall absorption contributed to the high uptake. In Paper III, conductive and flexible foams were obtained using carbon-based nanofillers and plasticizer. It was found that the electrical resistance of the carbon nanotubes and carbon black filled foams were strain-independent, which makes them suitable for applications in electromagnetic shielding (EMI) and electrostatic discharge protection (ESD). Paper IV describes a ‘water-welding’ method where larger pieces of WG foams were made by wetting the sides of the smaller cubes before being assembled together. The flexural strength of welded foams was ca. 7 times higher than that of the same size WG foam prepared in one piece. The technique provides a strategy for using freeze-dried WG foams in applications where larger foams are required.

Despite the versatile functionalities of the WG-based materials, the mechanical properties are often limited due to the brittleness of the dry solid WG. WG/flax composites were developed for improved mechanical properties of WG (Paper V). The results revealed that WG, reinforced with 19 wt% flax fibres, had a strength that was ca. 8 times higher than that of the pure WG matrix. Furthermore, the crack-resistance was also significantly improved in the presence of the flax.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. p. 98
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2017:30
Keywords
Wheat gluten, biofoam, biocomposite, freeze-drying, flame-retardant, silica, antimicrobial, bimodal, conductive biofoam, flax fiber, crack-resistance
National Category
Polymer Technologies
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-207778 (URN)978-91-7729-453-5 (ISBN)
Public defence
2017-08-25, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council Formas, 243-2011-1436
Note

QC 20170524

Available from: 2017-07-14 Created: 2017-05-23 Last updated: 2017-07-14Bibliographically approved

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