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Yoonessi, Mitra; Shi, Ying; Scheiman, Daniel A; Lebron-Colon, Marisabel; Tigelaar, Dean M; Weiss, R. A; Meador, Michael A
ACS nano, 09/2012, Letnik: 6, Številka: 9Journal Article
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 °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.
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