材料科学
纳米复合材料
复合材料
碳纳米管
聚酰亚胺
渗流阈值
介电损耗
电介质
扫描电子显微镜
介电常数
极限抗拉强度
静电纺丝
热稳定性
纳米纤维
聚合物
电阻率和电导率
化学工程
电气工程
工程类
光电子学
图层(电子)
作者
Wenhui Xu,Yichun Ding,Shaohua Jiang,Jian Zhu,Ye Wan,Youliang Shen,Haoqing Hou
标识
DOI:10.1016/j.eurpolymj.2014.07.028
摘要
High permittivity polyimide/carbon nanotubes (PI/MWCNTs) nanocomposites with good mechanical flexibility were prepared by electrospinning and hot-pressing. The homogeneity of MWCNTs in PI nanofibers and matrix were confirmed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The PI/MWCNTs nanocomposites showed high dielectric permittivity of 147–161 (at 1 kHz) at percolation threshold of 12–14 vol% concentration of MWCNTs and low dielectric loss below the percolation threshold. The PI/MWCNTs nanocomposites with 20 vol% concentration of MWCNTs had the highest dielectric permittivity of 217 (at 1 kHz), which was 57.5 times higher than the pure PI had. Compared to the maximum energy storage density of pure PI (0.404 J/cm3), the best maximum energy storage density of 1.957 J/cm3 was achieved by incorporating 12 vol% of MWCNTs into PI. The PI/MWCNTs nanocomposites (14 vol%) showed good mechanical flexibility with tensile strength, elongation at break and toughness more than 90 MPa, 12.8% and 5.0 J/g respectively and excellent thermal stability with 5% weight loss temperature of more than 560 °C. Therefore, this high performance PI/CNTs nanocomposites would be good candidates for modern microelectronics in high temperature areas.
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