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。
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.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2012年第2期59-64,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(50873091)
浙江省重大科技专项项目资助(2008C11002)
