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Graphene oxide enhanced ionic liquid plasticisation of chitosan/alginate bionanocomposites
Carbohydrate Polymers ( IF 11.2 ) Pub Date : 2020-10-16 , DOI: 10.1016/j.carbpol.2020.117231
Pei Chen , Fengwei Xie , Fengzai Tang , Tony McNally

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.



中文翻译:

壳聚糖/海藻酸钠生物纳米复合材料的氧化石墨烯增强的离子液体增塑

氧化石墨烯(GO)或还原的GO(rGO)对聚电解质复合壳聚糖/藻酸盐仿生复合材料的结构和性能的影响高度依赖于增塑剂类型(甘油或乙酸1-乙基-3-甲基咪唑鎓盐([C 2 mim] [OAc])),因为组件之间存在相互竞争的相互作用。对于甘油增塑的壳聚糖/藻酸盐基质,GO / rGO的加入增强了壳聚糖的结晶度并增加了基质的延展性。尽管由[C 2 mim] [OAc]增塑的壳聚糖/海藻酸盐基质显示出两种生物聚合物之间的相互作用显着减弱,但GO在抵消[C 2]的作用方面非常有效mim] [OAc]与生物聚合物和离子液体离子相互作用,从而提高机械性能并降低表面亲水性。与GO相比,rGO在促进壳聚糖与海藻酸盐之间的相互作用方面效果不佳,甚至导致更高的表面亲水性。但是,无论增塑剂类型如何,rGO的加入都会通过限制[C 2 mim] [OAc]与生物聚合物之间的相互作用而降低结晶度,并提高离子电导率。

更新日期:2020-10-30
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