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Influence of plasticiser type and nanoclay on the properties of chitosan-based materials

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Chen, Pei, Xie, Fengwei, Tang, Fengzai and McNally, Tony (2021) Influence of plasticiser type and nanoclay on the properties of chitosan-based materials. European Polymer Journal, 144 . 110225. doi:10.1016/j.eurpolymj.2020.110225

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Official URL: https://doi.org/10.1016/j.eurpolymj.2020.110225

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Abstract

Chitosan, a biocompatible polysaccharide having antimicrobial efficacy, is highly useful for biomedical and other applications. How chitosan properties can be tailored continues to attract intense research interest. Herein, chitosan and chitosan/carboxymethyl cellulose (CMC) materials filled with montmorillonite (MMT) were thermomechanically processed resulting in excellent nanoclay dispersion. Inclusion of MMT significantly increased molecular relaxation temperatures, tensile mechanical properties, and film surface hydrophobicity. When plasticisers such as 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]) or glycerol were introduced, the effect of MMT on the biopolymer properties largely depends on whether the MMT alters plasticiser–biopolymer interactions. [C2mim][OAc]-plasticised chitosan exhibited a relatively high contact angle (100 ± 7°) similar to the un-plasticised chitosan/MMT material, derived from the strong hydrogen-bonding capability of [C2mim][OAc]. Polyelectrolyte complexation (PEC) allowed the glycerol-plasticised chitosan/CMC material to have a hydrophobic surface (contact angle: 90 ± 6°) similar to that of the un-plasticised chitosan/CMC/MMT material. Specifically, further inclusion of MMT interrupted biopolymer–plasticiser interactions, leading to increased surface wettability. However, while addition of [C2mim][OAc] resulted in reduced hydrophilicity of the chitosan/CMC matrix, addition of MMT counteracted this effect by interacting with the IL. This work shows the plasticisers and MMT influence surface hydrophilicity mainly by determining the availability of free biopolymer polar groups.

Item Type: Journal Article
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Chitosan -- Biotechnology, Biopolymers -- Biotechnology, Polysaccharides -- Biotechnology, Plastics, Nanocomposites (Materials) -- Thermomechanical properties, Ceramics
Journal or Publication Title: European Polymer Journal
Publisher: Elsevier
ISSN: 0014-3057
Official Date: 5 February 2021
Dates:
DateEvent
5 February 2021Published
2 January 2021Available
16 December 2020Accepted
Volume: 144
Article Number: 110225
DOI: 10.1016/j.eurpolymj.2020.110225
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
798225[ERC] Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
UNSPECIFIEDChina Scholarship Councilhttp://dx.doi.org/10.13039/501100004543
GXPSMM18ZD-02Guangxi University for Nationalitieshttp://dx.doi.org/10.13039/501100004703

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