聚氯乙烯/炭黑复合型泡沫导电高分子材料的电性能

以特导炭黑（CB）为导电填料, 聚氯乙烯（PVC）和三元乙丙橡胶（EPDM）为主基体制备PVC泡沫导电复合材料, 研究该复合材料的泡孔结构和阻温特性, 分析炭黑含量、 交联剂和发泡剂对复合材料电性能的影响. 结果表明, 所制备的导电泡沫具有较理想的泡孔结构, 经过升温电阻测试, 该泡沫体出现负温度系数（NTC）效应, 随着炭黑含量的增加, 在NTC效应后期出现正温度系数（PTC）效应. 通过探讨NTC效应的机理, 确定了发泡剂和交联剂的用量, 从而获得良好的泡沫性能和NTC特性的导电泡沫材料. 

Electrical Properties of PVC/CB Conductive Foam

The electrical conductivity of PVC/CB foam made from carbon black, PVC and EPDM was studied. The bubble structure and resistivity-temperature characteristic were observed. Influences of carbon black content, crosslinker, foamer on conductive properties of PVC/CB foaming conductive composites were investi- gated. The obtained foam has a rather good bubble structure and mainly performs NTC effect during heating process. For the composites with high content of CB, PTC effect after a long time NTC effect was found. The conductive mechanism was explained and the proper filler contents of crosslinker and foamer were confirmed to make the composite have not only good foam performance but also NTC characteristic.