The moisture sensitivity and low wet strength limits the applications of nanocellulose-based composites and hybrids.<br/>In this contribution, we present a recent work on how to use tannins and gelatin in a leather-inspired process to produce nanocellulose-based hybrids with increased wet strength using only bio-based and renewable components. Gelatin was grafted onto pretreated nanocellulose by a Maillard reaction between the amino groups of gelatin and the aldehyde groups on the pretreated nanocellulose. The degree of gelatin grafting was identified by determining the decrease in aldehyde functions with hydroxylamine hydrochloride followed by titration. Films of gelatin-modified nanocellulose were crosslinked by a soluble tannin. The mechanical properties of the wet films during tension were measured in the fully hydrated state after immersing the films in water for one hour. The tannin-treated hybrid films showed an 18-fold increase in wet tensile strength compared to unmodified nanocellulose films.

Leather-inspired modification of nanocellulose-based hybrids to enhance wet strength

2019 Spring National Meeting

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