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首页> 外文期刊>RSC Advances >Novel green method of preparation of a poly (ethylene oxide)/graphene nanocomposite using organic salt assisted dispersion
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Novel green method of preparation of a poly (ethylene oxide)/graphene nanocomposite using organic salt assisted dispersion

机译：使用有机盐辅助分散体制备聚环氧乙烷/石墨烯纳米复合材料的新型绿色方法

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摘要

Nanocomposites of poly (ethylene oxide) (PEO) and graphene were made in aqueous solution using an organic salt containing a carboxylate ion and a carboxylic acid group. The cation corresponding to the carboxylate ion interacts with the pi electron clouds of graphene through cation-pi interaction and promotes the exfoliation of graphene sheets. The carboxylic acid group of the modifier forms H-bonds with the PEO and thereby improves interfacial adhesion. The effect of the number of carbon atoms present in the modifier on its dispersing ability was investigated. It was observed that there exists an optimum number of carbon atoms present in the modifier with respect to the level of dispersion of graphene in the related nanocomposites as examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The mechanical properties of the nanocomposites having various concentrations of graphene were evaluated and compared with the theoretical values using the Halpin-Tsai model. The crystallization behavior of the PEO upon incorporation of modified graphene was studied by temperature modulated differential scanning colorimetry (MDSC) and discussed as well. The dispersion process used here is green as it does not require any toxic solvent or hazardous material for modification of graphene.
机译：使用含有羧酸根离子和羧酸基团的有机盐，在水溶液中制备聚环氧乙烷（PEO）和石墨烯的纳米复合材料。对应于羧酸根离子的阳离子通过阳离子-pi相互作用与石墨烯的pi电子云相互作用，并促进石墨烯片的剥离。改性剂的羧酸基与PEO形成H键，从而改善界面粘合性。研究了改性剂中碳原子数对其分散能力的影响。观察到，通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）检查，相对于石墨烯在相关纳米复合材料中的分散水平，改性剂中存在最佳碳原子数。使用Halpin-Tsai模型评估了具有各种浓度石墨烯的纳米复合材料的机械性能，并将其与理论值进行了比较。通过温度调制差示扫描比色法（MDSC）研究了掺入改性石墨烯时PEO的结晶行为。此处使用的分散工艺是绿色的，因为它不需要任何有毒的溶剂或有害物质来修饰石墨烯。

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