Strong Surface Treatment Effects on Reinforcement Efficiency in Biocomposites Based on Cellulose Nanocrystals in Poly(vinyl acetate) Matrix

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• 作者：Farhan Ansari ; Michaela Salajkov谩 ; Qi Zhou ; Lars A. Berglund
• 刊名：Biomacromolecules
• 出版年：2015
• 出版时间：December 14, 2015
• 年：2015
• 卷：16
• 期：12
• 页码：3916-3924
• 全文大小：664K
• ISSN：1526-4602

文摘

In this work, the problem to disperse cellulose nanocrystals (CNC) in hydrophobic polymer matrices has been addressed through application of an environmentally friendly chemical modification approach inspired by clay chemistry. The objective is to compare the effects of unmodified CNC and modified CNC (modCNC) reinforcement, where degree of CNC dispersion is of interest. Hydrophobic functionalization made it possible to disperse wood-based modCNC in organic solvent and cast well-dispersed nanocomposite films of poly(vinyl acetate) (PVAc) with 1鈥?0 wt % CNC. Composite films were studied by infrared spectroscopy (FT-IR), UV鈥搗is spectroscopy, dynamic mechanical thermal analysis (DMTA), tensile testing, and field-emission scanning electron microscopy (FE-SEM). Strongly increased mechanical properties were observed for modCNC nanocomposites. The reinforcement efficiency was much lower in unmodified CNC composites, and specific mechanisms causing the differences are discussed.