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Hydrogel state impregnation of cellulose fibre-phenol composites: effects of fibre size distribution
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-2388-3358
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-4762-2854
2016 (English)In: ECCM 2016: Proceeding of the 17th European Conference on Composite Materials, European Conference on Composite Materials , 2016Conference paper, Published paper (Refereed)
Abstract [en]

Whilst it has been well established that cellulose nanofibres (CNF) networks produce films that have high stiffness and strength, they are difficult to impregnate. Investigated in this study is whether by controlling the degree of nanofibrillation of cellulose, composites based on micro- and nano-size cellulose fibres can be made that are more easily manufactured and have better impregnation than solely cellulose nano-fibre based composites. To evaluate this, cellulose at different stages of ultrafine grinding, extracted at time intervals of 30, 60 and 290 mins, were used to make composites. To achieve good impregnation a novel strategy was used based on impregnation with phenol resin whilst the fibrillated cellulose is in a hydrogel state. The composites were subsequently dried and consolidated by hot press. The current results show that this method of impregnation is successful and the phenol matrix greatly improves the properties of the cellulose with a low degree of fibrillation. In general, as the degree of fibrillation and the proportion of nanofibres increases, the mechanical properties of the networks and their composites increase. The addition of the matrix appears to restrict the deformation of CNF network, increasing the modulus and yield strength but decreasing the ultimate strength. The method also appears to restrict the consolidation and voids remain in the composite, which reduces the modulus when compared to theoretical maximum values for this material. More work on the consolidation process is necessary to achieve the full potential of these composites.

Place, publisher, year, edition, pages
European Conference on Composite Materials , 2016.
Keyword [en]
nanofibres, impregnation, phenol, network behaviour, fibrillation, Materials science - Other processing/assembly
Keyword [sv]
Teknisk materialvetenskap - Övrig bearbetning/sammanfogning
National Category
Bio Materials
Research subject
Wood and Bionanocomposites; Smart machines and materials (AERI)
Identifiers
URN: urn:nbn:se:ltu:diva-29908Scopus ID: 2-s2.0-85017671151Local ID: 388103c5-2224-45e5-8e38-95a1df306d90ISBN: 978-3-00-053387-7 (print)OAI: oai:DiVA.org:ltu-29908DiVA, id: diva2:1003135
Conference
17th European conference on composite materials, ECCM-17, Munich, Germany, 26-30 June 2016
Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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