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Performance of biocomposites from surface modified regenerated cellulose fibers and lactic acid thermoset bioresin
University of Borås, Faculty of Textiles, Engineering and Business. (Polymer group)ORCID iD: 0000-0003-2325-7928
University of Borås, Faculty of Textiles, Engineering and Business. (Polymer group)
Arcada University of Applied Science.
University of Borås, Faculty of Textiles, Engineering and Business. (Polymer group)ORCID iD: 0000-0002-6596-8069
2015 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882XArticle in journal (Refereed) Published
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

The effect of surface treatments, silane and alkali, on regenerated cellulose fibers was studied by using the treated fibers as reinforcement in lactic acid thermoset bioresin. The surface treatments were performed to improve the physico–chemical interactions at the fiber–matrix interface. Tensile, flexural and impact tests were used as indicator of the improvement of the interfacial strength. Furthermore, thermal conductivity, viscoelasticity measurements as well as microscopy images were made to characterize the fiber surface treatments and the effect on adhesion to the matrix. The results showed that silane treatment improved the mechanical properties of the composites as the silane molecule acts as link between the cellulose fiber and the resin (the fiber bonds with siloxane bridge while the resin bonds with organofunctional group of the bi-functional silane molecule) which gives molecular continuity in the interphase of the composite. Porosity volume decreased significantly on silane treatment due to improved interface and interlocking between fiber and matrix. Decrease in water absorption and increase in contact angle confirmed the change in the hydrophilicity of the composites. The storage modulus increased when the reinforcements were treated with silane whereas the damping intensity decreased for the same composites indicating a better adhesion between fiber and matrix on silane treatment. Thermogravimetric analysis indicated that the thermal stability of the reinforcement altered after treatments. The resin curing was followed using differential scanning calorimetry and the necessity for post-curing was recommended. Finite element analysis was used to predict the thermal behavior of the composites and a non-destructive resonance analysis was performed to ratify the modulus obtained from tensile testing. The changes were also seen on composites reinforced with alkali treated fiber. Microscopy images confirmed the good adhesion between the silane treated fibers and the resin at the interface.

Place, publisher, year, edition, pages
2015.
Keywords [en]
surface modification, cellulose fiber, mechanical properties, thermal conductivity, finite element analysis, resonance analysis
National Category
Polymer Technologies Composite Science and Engineering Textile, Rubber and Polymeric Materials Paper, Pulp and Fiber Technology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-70DOI: 10.1007/s10570-015-0643-xOAI: oai:DiVA.org:hb-70DiVA, id: diva2:812914
Funder
ÅForsk (Ångpanneföreningen's Foundation for Research and Development)Available from: 2015-05-20 Created: 2015-05-20 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Properties and performance of regenerated cellulose thermoset biocomposites
Open this publication in new window or tab >>Properties and performance of regenerated cellulose thermoset biocomposites
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Biocomposites have been developed to address the sustainability issues of nonrenewableresource based materials. These composites are often produced by reinforcing natural fibres in petroleum based thermoset resins or thermoplastic polymers. Thermoplastic polymers from renewable resources are commercially available, whereas thermoset resins are predominantly derived from crude oil resources. Cellulose fibres have significant importance and potential for polymer reinforcement in lightweight composites. Natural fibres are chemically diverse and their properties vary largely which makes it difficult for them to be used in several applications. The natural fibre based products are limited by their characteristic odour emissions. These issues of natural fibres can be addressed by partly manmade fibres i.e. regenerated cellulose fibre which with little or no compromise in the environmental benefits of the natural fibres can be produced from biomass origin. Natural fibres and their composites have been observed and researched closely for many decades. Study of regenerated cellulose fibres and their composites is, on the other hand, relatively new. Regenerated cellulose fibres are prospective reinforcing material in the composite field due to their even quality and high purity. These fibres have good mechanical properties and also address the odour emission issue of the natural fibres. The development of biocomposites from regenerated cellulose fibre and thermoset resin synthesized from renewable resources has therefore been viewed with considerable interest.

This thesis describes the development of biocomposites from regenerated cellulose fibres (lyocell and viscose) and thermoset resins synthesized from renewable resources (soybean oil and lactic acid). The performance and the properties of the composites were evaluated. Chemical surface treatments, alkali and silane, were performed on the fibres in order to improve the performance of the composites. Hybrid composites were also produced by mixing of two types of reinforcement in order to complement one type of fibre with other. The developed composites were evaluated through mechanical, thermal, viscoelastic and morphological properties among others. The results showed that the regenerated cellulose fibre thermoset biocomposites have reasonably good properties. Fibres before and after treatment were studied in detail. The silane treatment on these fibres improved the mechanical properties of the composites as the silane molecules act as a link between the fibre and resin which gives the molecular continuity across the interface region of the composite.

Place, publisher, year, edition, pages
Borås: Högskolan i Borås, 2015. p. 49
Series
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 57
Keywords
regenerated cellulose fibres, surface modification, alkali, silane, mechanical analysis, biocomposites, renewable resources
National Category
Environmental Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-26 (URN)978-91-87525-43-8 (ISBN)978-91-87525-44-5 (ISBN)
Public defence
2015-06-12, D207, University of Borås, Allégatan 1, Borås, 10:00 (English)
Opponent
Available from: 2015-05-19 Created: 2015-03-09 Last updated: 2015-12-18Bibliographically approved

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Publisher's full texthttp://link.springer.com/article/10.1007%2Fs10570-015-0643-x

Authority records BETA

Ramamoorthy, Sunil KumarBakare, FatimatSkrifvars, Mikael

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