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Novel aligned hemp fibre reinforcement for structural biocomposites: Porosity, water absorption, mechanical performances and viscoelastic behaviour
University of Borås, School of Engineering. (Polymer Group)
University of Borås, School of Engineering. (Polymer Group)
University of Borås, School of Engineering. (Polymer Group)
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2014 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 61, p. 1-12Article in journal (Refereed) Published
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

This paper examines the thermal and mechanical behaviour as well as moisture absorption of aligned hemp composites using hemp/PLA wrap spun yarns. Uniaxial composites were fabricated with 30 mass% hemp using compression moulding. The properties of composites in terms of hemp fibre orientation (aligned and random), off-axis angle and alkali treatment were investigated. It was found that the testing direction influenced the mechanical properties of the composites. Compared with all the fabricated composites, the aligned alkali hemp/PLA yarn composite possessed the best mechanical properties, including tensile, flexural and impact strengths, lower porosity and water absorption. The water absorption for all composites was higher than for neat PLA, both at room temperature and 80 C. The PLA in its treated composites had higher crystallinity, which was attributed to effective heterogeneous nucleation induced by hemp. Based on SEM observation and theoretical analysis of DMTA data, there was a favourable interfacial adhesion in all composites.

Place, publisher, year, edition, pages
Elsevier , 2014. Vol. 61, p. 1-12
Keywords [en]
Fabrics/textiles, Mechanical properties, Porosity, Compression moulding, Resource recovery
National Category
Chemical Sciences
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-1835DOI: 10.1016/j.compositesa.2014.01.017ISI: 000335104100001Local ID: 2320/13548OAI: oai:DiVA.org:hb-1835DiVA, id: diva2:869913
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2017-11-02Bibliographically approved
In thesis
1. Development of thermoplastic biocomposites based on aligned hybrid yarns for fast composite manufacturing
Open this publication in new window or tab >>Development of thermoplastic biocomposites based on aligned hybrid yarns for fast composite manufacturing
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The interest in natural fibres as reinforcement for composite materials has been steadily increasing due to their attractive mechanical properties and the possibility of making more eco-friendly materials. Currently, various alternatives are being introduced for commercial applications, as fibres such as hemp, jute and flax exhibit properties, which make them appropriate for structural composite components. Biocomposites offer reductions in weight and cost and have less reliance on foreign oil resources, making them attractive. Several investigations have revealed that the full utilisation of fibre mechanical properties in the final composites can be exploited, provided an aligned fibre orientation is chosen. In fact, a major challenge for natural fibre reinforced composites is to achieve high mechanical performance at competitive prices. The use of commingled/hybrid yarns is one of the more promising methods for manufacturing structural thermoplastic composites.

Commingled yarns of thermoplastic and reinforcing fibres offer a potential for cost-effective production of composite parts, thanks to reduced applied pressures and impregnation times during processing. Besides economic advantages, there is also direct control over fibre placements and ease of handling of fibres in yarn process. The yarn technologies provide homogenous distribution of reinforcing fibre and matrix. Variation in natural fibre properties has been a major problem facing composite manufacturers, compared to carbon and glass fibres that have well-defined production processes. This issue can be addressed by regenerated cellulose fibres. These fibres can be reproduced easily with high surface evenness and even quality, making it possible to get consistent results, which is not possible with natural fibres. Combination of natural and regenerated cellulose fibre brings together the best of both materials. The end result is a product with superior properties, which could not be obtained by the individual components.

This thesis describes the development of aligned hybrid yarns with low fibre twist, for high performance natural (hemp) and man-made (Lyocell) cellulose fibre-reinforced biocomposites, suitable for use in structural or semi-structural applications. The properties of composites in terms of fibre orientation, off-axis angle and alkali treatment were investigated, focusing on determining void%, water absorption, mechanical and thermo-mechanical properties. The results show that combining hemp and Lyocell in PLA composite leads to the reduction of moisture absorption and can improve the mechanical properties. The mechanical properties of the composites were highly affected by the fibre direction. The alkali treatment on hemp fibre improved the mechanical properties of the composites.

Place, publisher, year, edition, pages
Borås: Högskolan i Borås, 2015. p. 52
Series
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 74
Keywords
Hybrid yarns, Mechanical properties, Porosity, Weaving, Alkali treatment, Compression moulding
National Category
Textile, Rubber and Polymeric Materials
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-764 (URN)978-91-87525-79-7 (ISBN)978-91-87525-80-3 (ISBN)
Public defence
2015-11-27, D207, Allegatan 1, Borås, 10:00 (English)
Available from: 2015-10-26 Created: 2015-09-15 Last updated: 2015-12-18Bibliographically approved

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Baghaei, BehnazSkrifvars, MikaelBashir, Tariq

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