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Open AccessArticle

Functionalization of Cellulose Nanocrystals in Choline Lactate Ionic Liquid

Materials Division, IK4-CIDETEC Research Centre, Paseo de Miramón 196, 20009 San Sebastián, Spain
Chemical and Environmental Engineering Department, University of the Basque Country, Plaza Europa 1, 20018 San Sebastian, Spain
Author to whom correspondence should be addressed.
Academic Editor: Sofoklis Makridis
Materials 2016, 9(7), 499;
Received: 29 April 2016 / Revised: 15 June 2016 / Accepted: 20 June 2016 / Published: 23 June 2016
(This article belongs to the Special Issue Advances in Functionalization of Lignocellulosic Materials)
Cellulose nanocrystals (CNCs) are valuable nanomaterials obtained from renewable resources. Their properties make them suitable for a wide range of applications, including polymer reinforcement. However, due to their highly hydrophilic character, it is necessary to modify their surface with non-polar functional groups before their incorporation into a hydrophobic polymer matrix. In this work, cellulose nanocrystals were modified using a silane coupling agent and choline lactate, an ionic liquid derived from renewable resources, as a reaction medium. Modified cellulose nanocrystals were characterized by infrared spectroscopy, showing new peaks associated to the modification performed. X-ray diffraction was used to analyze the crystalline structure of functionalized cellulose nanocrystals and to optimize the amount of silane for functionalization. Poly(lactic acid) (PLA) nanocomposites containing 1 wt % of functionalized cellulose nanocrystals were prepared. They were characterized by field-emission scanning electron microscopy (FE-SEM) and mechanical tests. The use of choline lactate as reaction media has been shown to be an alternative method for the dispersion and silanization of the cellulose nanocrystals without the addition of an external catalyst. View Full-Text
Keywords: cellulose nanocrystals; functionalization; ionic liquid; poly(lactic acid) (PLA); nanocomposite cellulose nanocrystals; functionalization; ionic liquid; poly(lactic acid) (PLA); nanocomposite
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Montes, S.; Azcune, I.; Cabañero, G.; Grande, H.-J.; Odriozola, I.; Labidi, J. Functionalization of Cellulose Nanocrystals in Choline Lactate Ionic Liquid. Materials 2016, 9, 499.

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