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    Cellulose nanocrystal deposition onto regenerated cellulose fibres: effect on moisture absorption and fibre-matrix adhesion

    Year: 2018

    Journal: Cellulose, Volume 25, MAR, page 1783–1793

    Authors: Hajlane, Abdelghani; Joffe, Roberts; Kaddami, Hamid

    Organizations: Hassan II Academy of Science and Technology; Moroccan National Centre for Scientific and Technical Research; Swedish Research Council [2009-6433]; EXCEL project (local government Norrbotten, Sweden)

    Keywords: Cellulose fibres; Surface treatment; Moisture absorption; Cellulose nanocrystals; Fibre-matrix interface

    The effect of treatment of regenerated cellulose fibres by cellulose nanocrystals on the moisture absorption of the fibres as well as on fibre-epoxy resin adhesion has been investigated. Nanocrystals were deposited on the fibres using gamma-methacryloxypropyltrimethoxysilane (MPS) as coupling agent. Water absorption tests performed on fibres showed that, at 64% relative humidity, treatment by the coupling agent decreased the water uptake by a factor of two compared with untreated fibres, whereas deposition of cellulose nanocrystals (CNC) on fibres treated with MPS (FMMPS) did not further increase the water absorption despite the hydrophilic character of the CNC. This result was confirmed by monitoring fibre swelling using contact angle measurements. Indeed, it was found that FMMPS presented the same contact angle with glycerol before and after CNC deposition, being higher than that obtained for untreated fibres. The tensile strength and stiffness of fibres were not affected by moisture after either treatment, but nanocrystal deposition enhanced the fibre-epoxy resin adhesion, as revealed by results of pull-out tests performed on fibre bundles at 64% relative humidity.
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