Large-scale fabrication and electrical properties of an anisotropic conductive polymer composite utilizing preferable location of carbon nanotubes in a polymer blend
Large-scale fabrication and electrical properties of an anisotropic conductive polymer composite utilizing preferable location of carbon nanotubes in a polymer blend
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DOI：
10.1016/j.compscitech.2010.07.019
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发表时间：
2010-11-15
影响因子：
9.1
通讯作者：
Li, Zhong-Ming
中科院分区：
文献类型：
--
作者：
Gao, Jie-Feng;Yan, Ding-Xiang;Li, Zhong-Ming
采用狭缝模头挤出-热拉伸工艺制备了基于碳纳米管（CNT）和聚碳酸酯（PC）/聚乙烯（PE）共混物的各向异性导电聚合物复合材料（ACPC）。在剪切流和热拉伸的影响下，PC相在PE基体中原位变形为定向排列的导电原纤维，其表面区域容纳了大部分CNT。当拉伸比提高到一定水平时，ACPC的电阻率表现出很强的各向异性，垂直和平行拉伸方向相差三个数量级。纤维状ACPC表现出微弱的正温度系数（PTC）效应，以及在低于但接近230℃时PC原纤维重组引起的两过程负温度系数（NTC）效应，以及在230℃以上从各向异性到各向同性的转变。所获得的ACPC使其具有开关和传感器材料等潜在应用（C）2010 Elsevier Ltd.保留所有权利。
An anisotropically conductive polymer composite (ACPC) based on carbon nanotubes (CNTs) and polycarbonate (PC)/polyethylene (PE) blend was fabricated via a slit die extrusion-hot stretch process Under the influence of the shear flow and hot stretch, the PC phase is in situ deformed into aligned conductive fibrils in the PE matrix, whose surface region holds the majority of CNTs. When the stretch ratio rises to a certain level, the resistivity of the ACPC shows a strong anisotropy of three orders of magnitude difference between the perpendicular and parallel stretch directions. The fibrillar ACPC shows a weak positive temperature coefficient (PTC) effect, and two-process negative temperature coefficient (NTC) effect caused by the reorganization of PC fibrils below but near 230 degrees C, and the transformation from anisotropy to isotropy beyond 230 degrees C. The obtained ACPC allows it to have such potential applications as switch and sensor materials (C) 2010 Elsevier Ltd. All rights reserved.