Conductive composites of high surface area carbon black/polypropylene
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摘要: 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。
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关键词:
- 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
Abstract: 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.-
Key words:
- high surface area /
- polypropylene /
- conductive /
- NTC-PTC-NTC /
- electronic transition
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