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Biological–chemical modification of cellulose nanocrystal to prepare highly compatible chitosan-based nanocomposites

Cellulose, ISSN: 1572-882X, Vol: 26, Issue: 9, Page: 5267-5279
2019
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Abstract: As a reinforcement material, negatively charged cellulose nanocrystal (CNC) has worse compatibility with positively charged polymer matrixes like chitosan due to Coulomb and possible depletion interaction. In this paper, we develop an eco-friendly biological–chemical approach that involves the use of O/laccase/TEMPO system and Girard’s reagent T (GT) to oxidize and cationize the surface of CNC, that completely avoiding the formation of precipitation and/or aggregation during the preparation of CNC/chitosan bio-nanocomposites. The cross-sectional morphology of various nanocomposite films was observed by scanning electron microscopy. The addition of cellulose nanocrystals increased tensile strength (42%), decreased elongation at break (from 5.60 to 2.92%) and swelling degree (from 134 to 101%). This work offers a new path for the production of highly compatible CNC/cationic polymer composites which is different from commonly-used high-speed homogenization or stirring. Graphical abstract: [Figure not available: see fulltext.]

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