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Graphene oxide enhanced ionic liquid plasticisation of chitosan/alginate bionanocomposites

Lookup NU author(s): Professor David XieORCiD

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Abstract

The effect of graphene oxide (GO) or reduced GO (rGO) on the structure and properties of polyelectrolyte-complexed chitosan/alginate bionanocomposites is highly dependent on plasticiser type (glycerol or 1-ethyl-3-methylimidazolium acetate ([C₂mim][OAc])) due to the competing interactions between the components. For the glycerol-plasticised chitosan/alginate matrix, inclusion of GO/rGO enhanced the chitosan crystallinity and increased matrix ductility. While the chitosan/alginate matrix plasticised by [C₂mim][OAc] showed dramatically weakened interactions between the two biopolymers, GO was highly effective at counteracting the effect of [C₂mim][OAc] by interacting with the biopolymers and the ionic liquid ions, resulting in enhanced mechanical properties and decreased surface hydrophilicity. Compared with GO, rGO was much less effective at promoting chitosan–alginate interactions and even resulted in higher surface hydrophilicity. However, irrespective of the plasticiser type, inclusion of rGO resulted in reduced crystallinity by restricting the interactions between [C₂mim][OAc] and the biopolymers, and higher ionic conductivity.

Publication metadata

Author(s): Chen P, Xie F, Tang F, McNally T

Publication type: Article

Publication status: Published

Journal: Carbohydrate Polymers

Year: 2021

Volume: 253

Print publication date: 01/02/2021

Online publication date: 16/10/2020

Acceptance date: 09/10/2020

Date deposited: 23/05/2023

ISSN (print): 0144-8617

ISSN (electronic): 1879-1344

Publisher: Elsevier

URL: https://doi.org/10.1016/j.carbpol.2020.117231

DOI: 10.1016/j.carbpol.2020.117231

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