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Ionic liquid (1-ethyl-3-methylimidazolium acetate) plasticization of chitosan-based bionanocomposites

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Chen, Pei, Xie, Fengwei, Tang, Fengzai and McNally, Tony (2020) Ionic liquid (1-ethyl-3-methylimidazolium acetate) plasticization of chitosan-based bionanocomposites. ACS Omega, 5 (30). pp. 19070-19081. doi:10.1021/acsomega.0c02418

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Official URL: https://dx.doi.org/10.1021/acsomega.0c02418

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Abstract

The structure and properties of different biopolymer composites based on chitosan and chitosan/carboxymethyl cellulose (CMC) are governed by multiple structure–property relationships associated with different phase interactions. Plasticization of these matrices with ionic liquid 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]) played a dominant role, increasing the mobility of biopolymer chains as well as ions and associated dipoles but reducing biopolymer chain interactions, crystallinity, and thermal stability. These structural changes led to higher matrix ionic conductivity, shorter electrical relaxation time, and greater matrix ductility. The inclusion of graphene oxide (GO) and reduced GO (rGO) also influenced the structure and properties of these bionanocomposites by disrupting the biopolymer hydrogen bonding and/or polyelectrolyte complexation (PEC) and interacting with [C2mim][OAc]. The impact of GO/rGO was more evident for 20 wt % [C2mim][OAc], such as increased crystallinity and thermal stability of chitosan. PEC was hindered with excess (40 wt %) [C2mim][OAc] added and further hindered again when rGO was included. This study shows that the structure and properties of bionanocomposites are not just determined by the surface chemistry of GO/rGO but can also be influenced by multiple interactions involving plasticizers such as ILs and additional biopolymers.

Item Type: Journal Article
Subjects: Q Science > QP Physiology
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Biopolymers, Nanostructured materials, Carbon, Polymers -- Thermal properties
Journal or Publication Title: ACS Omega
Publisher: American Chemical Society
ISSN: 2470-1343
Official Date: 2020
Dates:
DateEvent
2020Published
22 July 2020Available
8 July 2020Accepted
Date of first compliant deposit: 23 July 2020
Volume: 5
Number: 30
Page Range: pp. 19070-19081
DOI: 10.1021/acsomega.0c02418
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
798225Horizon 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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