Facile Preparation of Lightweight Microcellular Polyetherimide/Graphene Composite Foams for Electromagnetic Interference Shielding
Facile Preparation of Lightweight Microcellular Polyetherimide/Graphene Composite Foams for Electromagnetic Interference Shielding
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DOI：
10.1021/am303289m
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发表时间：
2013-04-10
影响因子：
9.5
通讯作者：
Zheng, Wen Ge
中科院分区：
文献类型：
--
作者：
Ling, Jianqiang;Zhai, Wentao;Zheng, Wen Ge
我们报道了一种通过相分离工艺制备密度约为0.3克/立方厘米的轻质微孔聚醚酰亚胺（PEI）/石墨烯纳米复合泡沫的简便方法。观察到在泡孔生长过程中产生的强烈拉伸流促使石墨烯在泡孔壁上富集和取向。这一作用使电导率渗滤阈值从聚醚酰亚胺/石墨烯纳米复合材料的0.21体积%降低到聚醚酰亚胺/石墨烯泡沫的0.18体积%。此外，发泡过程使比电磁干扰（EMI）屏蔽效能从17显著提高到44分贝/(克/立方厘米)。此外，聚醚酰亚胺/石墨烯纳米复合泡沫即使在200℃时也具有0.065 - 0.037瓦/米·开的低导热系数以及180 - 290兆帕的高杨氏模量。
We report a facile approach to produce lightweight microcellular polyetherimide (PEI)/graphene nanocomposite foams with a density of about 0.3 g/cm(3) 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/cm(3)). In addition, PEI/graphene nanocomposite foams possessed low thermal conductivity of 0.065-0.037 W/m.K even at 200 degrees C and high Young's modulus of 180-290 MPa.