Modified Graphene/Polyimide Nanocomposites: Reinforcing and Tribological Effects

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• 作者：Ting Huang ; Yuanshi Xin ; Tongsheng Li ; Steven Nutt ; Chao Su ; Haiming Chen ; Pei Liu ; Zuliang Lai
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：June 12, 2013
• 年：2013
• 卷：5
• 期：11
• 页码：4878-4891
• 全文大小：898K
• 年卷期：v.5,no.11(June 12, 2013)
• ISSN：1944-8252

文摘

By taking advantage of design and construction of strong graphene鈥搈atrix interfaces, we have prepared modified graphene/polyimide (MG/PI) nanocomposites via a two-stage process consisting of (a) surface modification of graphene and (b) in situ polymerization. The 2 wt % MG/PI nanocomposites exhibited a 20-fold increase in wear resistance and a 12% reduction in friction coefficient, constituting a potential breakthrough for future tribological application. Simultaneously, MG also enhanced thermal stability, electrical conductivity, and mechanical properties, including tensile strength, Young鈥檚 modulus, storage modulus, and microhardness. Excellent thermal stability and compatibility of interface, strong covalent adhesion interaction and mechanical interlocking at the interface, as well as homogeneous and oriented dispersion of MG were achieved here, contributing to the enhanced properties observed here. The superior wear resistance is ascribed to (a) tribological effect of MG, including suppression effect of MG in the generation of wear debris and protective effect of MG against the friction force, and (b) the increase in mechanical properties. In light of the relatively low cost and the unique properties of graphene, the results of this study highlight a pathway to expand the engineering applications of graphene and solve wear-related mechanical failures of polymer parts.

Keywords:

modified graphene; polyimide nanocomposites; reinforcing effect; tribological effect; design and construction of interface