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高比表面积炭黑/聚丙烯导电复合材料

, PP. 59-64

Keywords: 高比表面积,聚丙烯,导电,负温度系数-正温度系数-负温度系数,电子跃迁

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Abstract:

研究了高比表面积炭黑(Ketjenblack,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。

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