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Characterization of interfacial stress transfer ability in acetylation-treated wood fibre composites using X-ray microtomography
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Materials in Medicine)
SP Technical Research Institute of Sweden, Sustainable Built Environment & KTH, Div. of Building Materials.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Materials in Medicine)ORCID iD: 0000-0001-6663-6536
SP Technical Research Institute of Sweden, Sustainable Built Environment.
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2017 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 95, 43-49 p.Article in journal (Refereed) Published
Abstract [en]

The properties of the fibre/matrix interface contribute to stiffness, strength and fracture behaviour of fibre-reinforced composites. In cellulosic composites, the limited affinity between the hydrophilic fibres and the hydrophobic thermoplastic matrix remains a challenge, and the reinforcing capability ofthe fibres is hence not fully utilized. A direct characterisation of the stress transfer ability through pull-out tests on single fibres is extremely cumbersome due to the small dimension of the wood fibres. Here a novel approach is proposed:the length distribution ofthe fibres sticking out ofthe matrix atthe fracture surface is approximated using X-ray microtomography and is used as an estimate of the adhesion between the fibres and the matrix. When a crack grows in the material, the fibres will either break or be pulled-out of the matrix depending on their adhesion to the matrix: good adhesion between the fibres and the matrix should result in more fibre breakage and less pull-out of the fibres than poor adhesion. The effect of acetylation on the adhesion between the wood fibres and the PLA matrix was evaluated at different moisture contents using the proposed method. By using an acetylation treatment of the fibres it was possible to improve the strength of the composite samples soaked in the water by more than 30%.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 95, 43-49 p.
Keyword [en]
CT analysis, Wood fibres, PLA, Adhesion, Acetylation
National Category
Medical Materials Biomaterials Science
Research subject
Engineering Science with specialization in Materials Science
Identifiers
URN: urn:nbn:se:uu:diva-335525DOI: 10.1016/j.indcrop.2016.10.009OAI: oai:DiVA.org:uu-335525DiVA: diva2:1163299
Funder
Swedish Research Council Formas, 232-2014-202
Available from: 2017-12-06 Created: 2017-12-06 Last updated: 2017-12-13

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