Negative Temperature Coefficient of Resistivity in Lightweight Conductive Carbon Nanotube/Polymer Composites
Negative Temperature Coefficient of Resistivity in Lightweight Conductive Carbon Nanotube/Polymer Composites
复制标题
轻质导电碳纳米管/聚合物复合材料的电阻率负温度系数
DOI：
10.1002/mame.200800273
复制
发表时间：
2009-02-13
影响因子：
3.9
通讯作者：
Bian, Xiang-Cheng
中科院分区：
文献类型：
--
作者：
Xiang, Zhi-Dong;Chen, Tao;Bian, Xiang-Cheng
制备泡沫CPC材料特别困难，因为其多孔结构使得难以形成导电网络。采用丙酮辅助分散法将碳纳米管分散到聚氨酯泡沫中，成功制备了一种轻质导电碳纳米管/聚氨酯泡沫复合材料。NTC效应只存在于熔融态CPC材料中，在固态轻质导电CNT/sPU复合材料中意外地观察到。较高的含气率和较低的基体模量会导致较强的NTC效应。已提出的机制，包裹在蜂窝结构的气体的热膨胀诱导更完美的导电路径，以满意地阐明NTC效应及其气体分数和矩阵模量的依赖性。
It is particularly difficult to prepare a foam CPC material because its porous structure makes it hard to form a conductive network. We utilized acetone-assisted dispersion to disperse CNTs into PU foam and successfully prepared a lightweight conductive CNT/assembled PU foam composite. The NTC effect, which exclusively exists in the melt state CPC materials, has unexpectedly been observed in the solid-state lightweight conductive CNT/sPU composite. Higher gas fraction and lower matrix modulus could result in stronger NTC effect. The mechanism that thermal expansion of gas wrapped in the cellular structure induces more perfect conductive paths has been proposed to satisfactorily elucidate the NTC effect and its gas fraction and matrix modulus dependence.