Design and preparation of graphene/poly(ether ether ketone) composites with excellent electrical conductivity
Design and preparation of graphene/poly(ether ether ketone) composites with excellent electrical conductivity
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DOI：
10.1007/s10853-013-7940-2
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发表时间：
2014-03-01
影响因子：
4.5
通讯作者：
Wang, Guibin
中科院分区：
文献类型：
--
作者：
Yang, Lilong;Zhang, Shuling;Wang, Guibin
采用热压法制备了热压石墨烯/聚醚醚酮(m-TRG/PEEK)复合材料。用精密阻抗分析仪、热重分析仪、差示扫描量热仪和万能试验机研究了PEEK/m-TRG复合材料的导电性能、热性能和力学性能。加入石墨烯后，m-TRG/PEEK复合材料的导电性大大提高，实现了从电绝缘体到半导体的急剧转变，其渗流阈值低达0.76%。当m-TRG体积分数为3.84vol.%时，电导率达到0.18m~(-1)。并与化学还原的复合材料进行了比较，结果表明热还原是获得高导电性复合材料的有效方法。扫描电子显微镜分析表明，m-TRG具有较大的比表面积，在PEEK基质中分散性好，与PEEK基质具有良好的相容性，具有良好的电性能。此外，m-TRG/PEEK复合材料还表现出较好的热性能和力学性能。
Graphene/poly(ether ether ketone) (m-TRG/PEEK) composites with excellent electrical conductivity were fabricated by hot pressing technique with thermally reduced graphene nanosheets (m-TRG) which were modified by poly(ether sulfone). Moreover, the conductive, thermal, and mechanical properties of PEEK/m-TRG composites were investigated by the precision impedance analyzer, thermal gravimetric analyzer, differential scanning calorimetry, and universal tester, respectively. The electrical conductivity of m-TRG/PEEK composites was greatly improved by incorporating graphene, resulting in a sharp transition from electrical insulator to semiconductor with a low percolation threshold of 0.76 vol.%. A high electrical conductivity of 0.18 S m(-1) was achieved with 3.84 vol.% of m-TRG. The data were compared with those of composites reduced chemically, and the results showed that thermal reduction was an effective method to acquire higher electrical conductive composites. The excellent electrical property should be attributed to the large specific surface area of m-TRG, well dispersion of m-TRG in PEEK matrix, and good compatibility of m-TRG with PEEK matrix, as proven by scanning electron microscope. Besides, m-TRG/PEEK composites also exhibited relatively good thermal and mechanical properties.