Graphene oxide enhanced ionic liquid plasticisation of chitosan/alginate bionanocomposites

Pei Chen; Fengwei Xie; Fengzai Tang; Tony McNally

doi:10.1016/j.carbpol.2020.117231

Graphene oxide enhanced ionic liquid plasticisation of chitosan/alginate bionanocomposites

Pei Chen, Fengwei Xie, Fengzai Tang, Tony McNally

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12 Citations (SciVal)

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.

Original language	English
Article number	117231
Journal	Carbohydrate Polymers
Volume	253
DOIs	https://doi.org/10.1016/j.carbpol.2020.117231
Publication status	Published - 1 Feb 2021

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Ltd

Funding

The authors acknowledge funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 798225 . P. Chen acknowledges the financial support from the China Scholarship Council (CSC) for her visiting position and thanks IINM, WMG, University of Warwick, UK for hosting her research visit. F. Xie also acknowledges support from the Guangxi Key Laboratory for Polysaccharide Materials and Modification , Guangxi University for Nationalities, China (grant No. GXPSMM18ZD-02 ). The authors acknowledge funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sk?odowska-Curie grant agreement No. 798225. P. Chen acknowledges the financial support from the China Scholarship Council (CSC) for her visiting position and thanks IINM, WMG, University of Warwick, UK for hosting her research visit. F. Xie also acknowledges support from the Guangxi Key Laboratory for Polysaccharide Materials and Modification, Guangxi University for Nationalities, China (grant No. GXPSMM18ZD-02).

Funders	Funder number
Guangxi Key Laboratory for Polysaccharide Materials and Modification
H2020 Marie Skłodowska-Curie Actions
Horizon 2020 Framework Programme
China Scholarship Council
Guangxi University for Nationalities	GXPSMM18ZD-02
EU - Horizon 2020	798225

Keywords

1-Ethyl-3-methylimidazolium acetate
Chitosan nanocomposites
Glycerol
Graphene oxide
Polyelectrolyte complexation
Polysaccharide thermomechanical processing

ASJC Scopus subject areas

Polymers and Plastics
Organic Chemistry
Materials Chemistry

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10.1016/j.carbpol.2020.117231Licence: CC BY

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title = "Graphene oxide enhanced ionic liquid plasticisation of chitosan/alginate bionanocomposites",

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.",

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author = "Pei Chen and Fengwei Xie and Fengzai Tang and Tony McNally",

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AB - 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.

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Graphene oxide enhanced ionic liquid plasticisation of chitosan/alginate bionanocomposites

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

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