研究了高比表面积炭黑（Ketjen black,KB）填充聚丙烯复合材料（KB/PP）的导电性能及体积电阻率-温度特性。结果表明,当KB填充含量达到0.5%～1.5%（体积分数）时,KB/PP复合材料出现电渗流行为,表现出优异的室温导电性能。同时,KB/PP复合材料的体积电阻率-温度特性曲线呈现出特殊的负温度系数-正温度系数-负温度系数（NTC-PTC-NTC）三阶段特征,体积电阻率随温度的上升,先出现下降产生第一个NTC效应,然后出现PTC效应及第二个NTC效应。在相对低温范围内,第一个NTC效应具有良好的稳定性和重复性。KB表面的电子跃迁导电、基体体积膨胀两种效应的叠加是造成KB/PP复合材料出现三阶段特征的原因。
Conductive properties and volume resistivity-temperature characteristics of high surface area carbon black（Ketjen black,KB） filled polypropylene（PP） composites were studied.The results show that as the KB contents reach to 0.5%~1.5%（volume fraction）,KB/PP composites appear electrical percolation behavior which exhibits the excellent room temperature conductivity.Meanwhile,the volume resistivity of composites-temperature characteristic curve shows a special negative temperature coefficient-positive temperature coefficient-negative temperature coefficient（NTC-PTC-NTC） characteristic of three stages.The volume resistivity of the KB/PP composites system increases with the temperature,appearing first NTC effect as a decline in the first,and then PTC effect and the second NTC effect.The first NTC of KB/PP composites system has a good effect of the stability and repeatability within a relatively low temperature range.The superposition of the conductive effect of the electronic transition from KB surface and matrix volume expansion effect cause the system to appear three stages feature.
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