Positive temperature coefficient and time‐dependent resistivity of carbon nanotubes (CNTs)/ultrahigh molecular weight polyethylene (UHMWPE) composite
Positive temperature coefficient and time‐dependent resistivity of carbon nanotubes (CNTs)/ultrahigh molecular weight polyethylene (UHMWPE) composite
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DOI：
10.1002/app.30468
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发表时间：
2009-10
影响因子：
3
通讯作者：
Jie-feng Gao;Dingxiang Yan;Hua-Dong Huang;K. Dai;Zhong‐Ming Li
中科院分区：
文献类型：
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作者：
Jie-feng Gao;Dingxiang Yan;Hua-Dong Huang;K. Dai;Zhong‐Ming Li
成功地制备了碳纳米管/超高相对分子质量聚乙烯(CNTs/UHMWPE)导电复合材料，该复合材料具有较低的渗流阈值，碳纳米管只分散在基质粒子的界面上。考察了碳纳米管浓度、加工温度、等温处理时间等因素对复合材料正温度系数效应的影响。与负温度系数效应类似，UHMWPE在熔点以上等温处理时，其电阻率下降，可以认为这是一种源于分子链运动的弛豫过程。这种弛豫也是碳纳米管聚集重组导电网络的过程，被证明是时间、温度、填料浓度和升温速率的函数。©2009 Wiley期刊，Inc.《应用理工学院》，2009
The carbon nanotubes/ultrahigh molecular weight polyethlene (CNTs/UHMWPE) conductive composite with a low percolation threshold had been successfully fabricated, and CNTs were only dispersed in the interface of matrix particles. Some factors, including CNTs concentration, processing temperature, and the time of isothermal treatment, which could exert influence on the positive temperature coefficient effect of the composite, were investigated. Similar with negative temperature coefficient effect, the resistivity decreased during isothermal treatment above the melting point of UHMWPE, which could be thought to be a relaxation process originated from movement of molecular chains. This relaxation, also a process of CNTs aggregating to reorganize the conductive network, was testified as a function of time, temperature, filler concentration, and heating rate. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009