Chen, Pei, Xie, Fengwei, Tang, Fengzai and McNally, Tony (2020) Thermomechanical-induced polyelectrolyte complexation between chitosan and carboxymethyl cellulose enabling unexpected hydrolytic stability. Composites Science and Technology, 189 . 108031. doi:10.1016/j.compscitech.2020.108031

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Abstract

Natural biopolymers such as chitosan and cellulose have demonstrated huge potential in important and rapidly growing environmental and biomedical applications. However, it is always challenging to create advanced functional biopolymer materials with enhanced hydrolytic stability cost-effectively. Here, we report an advance in preparing biopolymer polyelectrolyte complexed materials based on chitosan and carboxymethyl cellulose (CMC) using a “dry”, thermo-mechanical kneading method. Despite the high hydrophilicity of chitosan and CMC, the resulting films showed excellent dimensional stability and structural integrity (27% dimensional expansion and 94% weight increase after hydration for one day). In comparison, chitosan-only films were swollen dramatically under the same conditions, with a 138% dimensional expansion and a 913% rise in weight, which were also fragile. We propose that our processing method led to polyelectrolyte complexation between chitosan and CMC generating physical crosslinking points in the materials, which stabilised the films in water. Interestingly, the greater hydrolytic stability of chitosan/CMC films is in contrast with their higher surface hydrophilicity, a contribution from CMC. Our simple approach to engineering high-performance biopolymer materials without resorting to complex chemistries can be envisioned to bring about a new direction in the design of advanced functional materials where sustainability and cost-effectiveness are priorities.

Item Type:	Journal Article
Subjects:	T Technology > TP Chemical technology
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH):	Chitosan -- Biotechnology, Biopolymers, Nanocomposites (Materials) -- Thermomechanical properties, Nanostructured materials
Journal or Publication Title:	Composites Science and Technology
Publisher:	Pergamon
ISSN:	0266-3538
Official Date:	22 March 2020
Dates:	Date Event 22 March 2020 Published 24 January 2020 Available 21 January 2020 Accepted
Volume:	189
Article Number:	108031
DOI:	10.1016/j.compscitech.2020.108031
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Description:	European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 798225. China Scholarship Council (CSC) Guangxi Key Laboratory of Polysaccharide Materials and Modification, Guangxi University for Nationalities, China (Grant No. GXPSMM18ZD-02).
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID 798225 Horizon 2020 Framework Programme http://dx.doi.org/10.13039/100010661 UNSPECIFIED China Scholarship Council http://dx.doi.org/10.13039/501100004543 GXPSMM18ZD-02 Guangxi University for Nationalities http://dx.doi.org/10.13039/501100004703

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