Journal
HOLZFORSCHUNG
Volume 60, Issue 1, Pages 53-58Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/HF.2006.010
Keywords
aspect ratio; cellulose crystallinity; microfibre; reinforcement
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In this study, the reinforcing potential of cellulose microfibres'' obtained from bleached softwood kraft pulp was demonstrated in a matrix of polyvinyl alcohol (PVA). Microfibres are defined as fibres of cellulose of 0.1-1 mm in diameter, with a corresponding minimum length of 5-50 mm. Films cast with these microfibres in PVA showed a doubling of tensile strength and a 2.5-fold increase in stiffness with 5% microfibre loading. The theoretical stiffness of a microfibre was calculated as 69 GPa. The study also demonstrated that the strength of the composite was greater at 5% microfibre loading compared to 10% loading. Comparative studies with microcrystalline cellulose showed that the minimum aspect ratio of the reinforcing agent is more critical than its crystallinity in providing reinforcement in the composite.
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