Facile Preparation of Lightweight Microcellular Polyetherimide/Graphene Composite Foams for Electromagnetic Interference Shielding

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• 作者：Jianqiang Ling ; Wentao Zhai ; Weiwei Feng ; Bin Shen ; Jianfeng Zhang ; Wen ge Zheng
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：April 10, 2013
• 年：2013
• 卷：5
• 期：7
• 页码：2677-2684
• 全文大小：606K
• 年卷期：v.5,no.7(April 10, 2013)
• ISSN：1944-8252

文摘

We report a facile approach to produce lightweight microcellular polyetherimide (PEI)/graphene nanocomposite foams with a density of about 0.3 g/cm³ by a phase separation process. It was observed that the strong extensional flow generated during cell growth induced the enrichment and orientation of graphene on cell walls. This action decreased the electrical conductivity percolation from 0.21 vol % for PEI/graphene nanocomposite to 0.18 vol % for PEI/graphene foam. Furthermore, the foaming process significantly increased the specific electromagnetic interference (EMI) shielding effectiveness from 17 to 44 dB/(g/cm³). In addition, PEI/graphene nanocomposite foams possessed low thermal conductivity of 0.065鈥?.037 W/m路K even at 200 掳C and high Young鈥檚 modulus of 180鈥?90 MPa.

Keywords:

polyetherimide; microcellular foam; graphene; electrical conductivity; electromagnetic interference shielding