Abstract Creep can be understood as the resistance of a material to a continuous stress and represents an important property for engineering design. The creep behaviour of a series of nanocomposites with electromechanical applications based on a thermoplastic elastomer, poly(styrene-b-ethylene-co-butylene-b-styrene) (SEBS), and small amounts of graphene has been explored using cylindrical flat punch depth-sensing indentation. Special attention is paid to the influence of the nature of the polymer brushes (polyethylene or polystyrene) attached to the graphene surface. Common methodologies for indentation creep analysis are critically examined and brought together to provide a comprehensive picture of creep deformation. It is found that graphene significantly reduces the creep rate and this is most significant under viscoplastic deformation than in the linear viscoelastic regime. Most interesting, polyethylene branches reduce visco-elastic-plastic flow in a more effective manner and this is attributed to the selective interaction of the filler with the matrix chains.

中文翻译：

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平面冲头压痕弹性纳米复合材料的蠕变行为：石墨烯改性和含量的影响

摘要 蠕变可以理解为材料对连续应力的抵抗力，是工程设计的一个重要特性。使用圆柱形平面冲压深度探索了一系列基于热塑性弹性体、聚（苯乙烯-b-乙烯-共-丁烯-b-苯乙烯）（SEBS）和少量石墨烯的具有机电应用的纳米复合材料的蠕变行为-感应压痕。特别注意附着在石墨烯表面的聚合物刷（聚乙烯或聚苯乙烯）的性质的影响。对压痕蠕变分析的常用方法进行了严格检查，并将其汇集在一起​​，以提供蠕变变形的全面图景。发现石墨烯显着降低了蠕变速率，这在粘塑性变形下比在线性粘弹性状态下最为显着。最有趣的是，聚乙烯支链以更有效的方式降低了粘弹塑性流动，这归因于填料与基体链的选择性相互作用。