Graphene Polyimide Nanocomposites; Thermal, Mechanical, and High-Temperature Shape Memory Effects

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• 作者：Mitra Yoonessi ; Ying Shi ; Daniel A. Scheiman ; Marisabel Lebron-Colon ; Dean M. Tigelaar ; R. A. Weiss ; Michael A. Meador
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：September 25, 2012
• 年：2012
• 卷：6
• 期：9
• 页码：7644-7655
• 全文大小：897K
• 年卷期：v.6,no.9(September 25, 2012)
• ISSN：1936-086X

文摘

Flexible graphene polyimide nanocomposites (0.1鈥? 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鈥?0% higher than those of unmodified graphene nanocomposites. Both neat polyimide and polyimide nanocomposites exhibited shape memory effects with a triggering temperature of 230 掳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.

Keywords:

graphene; polyimide nanocomposites; shape memory polymers; mechanical properties; thermal stability; exfoliation