Graphene Polyimide Nanocomposites; Thermal, Mechanical, and High-Temperature Shape Memory Effects
Graphene Polyimide Nanocomposites; Thermal, Mechanical, and High-Temperature Shape Memory Effects
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DOI：
10.1021/nn302871y
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发表时间：
2012-09-01
期刊：
影响因子：
17.1
通讯作者：
Meador, Michael A.
中科院分区：
文献类型：
--
作者：
Yoonessi, Mitra;Shi, Ying;Meador, Michael A.
采用溶液共混法制备了柔性石墨烯/聚酰亚胺纳米复合材料（0.1 - 4 wt %），其力学性能优于纯聚酰亚胺树脂的上级力学性能。采用分步缩合和热亚胺化方法将酰亚胺部分接枝到胺官能化的石墨烯上。酰亚胺官能化的石墨烯表现出与N-甲基-2-吡咯烷酮的优异相容性。对于未改性石墨烯和酰亚胺化石墨烯，石墨烯聚酰亚胺纳米复合材料的动态储能模量随着石墨烯含量的增加而线性增加。酰亚胺化的石墨烯纳米复合材料的模量比未改性的石墨烯纳米复合材料的模量高25 - 30%。纯聚酰亚胺和聚酰亚胺纳米复合材料都表现出形状记忆效应，触发温度为230 ℃。其中石墨烯的加入提高了回收率。石墨烯的加入改善了石墨烯和改性石墨烯的聚酰亚胺纳米复合材料的热稳定性。
Flexible graphene polyimide nanocomposites (0.1-4 wt %) with superior mechanical properties over those of neat polyimide resin have been prepared by solution blending. Imide moieties were grafted to amine-functionalized graphene using a step-by-step condensation and thermal imidization method. The imide-functionalized graphene exhibited excellent compatibility with N-methyl-2-pyrrolidone. The dynamic storage moduli of the graphene polyimide nanocomposites increased linearly with increasing graphene content for both unmodified graphene and imidized graphene. Moduli of the imidized graphene nanocomposites were 25-30% higher than those of unmodified graphene nanocomposites. Both neat polyimide and polyimide nanocomposites exhibited shape memory effects with a triggering temperature of 230 degrees C. where addition of graphene improved the recovery rate. Addition of graphene improved thermal stability of the polyimide nanocomposites for both graphene and modified graphene.