石墨烯-聚(苯乙烯-co-丙烯酸丁酯)复合材料的力学及形状回复性能

Study on the Mechanical Properties and Shape Recovery Capability of Graphene-Poly(styrene-co-butyl acrylate) Composites

采用Hummers氧化法制备氧化石墨烯,再以水合肼为还原剂制得石墨烯。用异氰酸酯处理石墨烯以对其进行改性。以苯乙烯和丙烯酸丁酯作为形状记忆聚合物的共聚单体,将石墨烯和经异氰酸酯处理的石墨烯分别加入单体溶液中,采用自由基聚合的方法获得了不同石墨烯含量的石墨烯-聚(苯乙烯-co-丙烯酸丁酯)形状记忆复合材料。DMA、力学性能测试表明,掺杂石墨烯或经异氰酸酯处理的石墨烯后,形状记忆聚合物的储能模量和玻璃化转变温度均降低;随石墨烯含量的增加,复合材料的拉伸模量降低;在相同温度下,用经异氰酸酯处理的石墨烯制得的复合材料的形状回复能力普遍大于用相同含量的未处理石墨烯制得的复合材料。

The present work aims at the fabrication and mechanical & shape recovery performances of a graphene-poly(styrene-co-butyl acrylate)composite.First,the graphene oxide was prepared by Hummers method,and then reduced by using hydrazine hydrate to prepare graphene.Secondly,the graphene and isocyanate-treated graphene were separately added into a mixed solution containing styrene and butyl acrylate which served as monomers,and a free radical polymerization process was employed to fabricate a series of shape memory composites(graphene-poly(styrene-co-butyl acrylate))differed in graphene content.We then characterized and estimated the shape memory composites' performances by applying DMA test and mechanical properties tests,and the results indicated that both the additions of graphene and isocyanate-treated graphene contribute to the declines of both storage modulus and glass transition temperature of the shape memory composites.An inverse correlation between graphene content and tensile modulus of the composites was also observed.At the same temperature,the shape recovery capability of the composites fabricated with isocyanate-treated graphene is generally better than that with untreated graphene(under equal graphene content).