热处理对聚乙烯/炭黑型PTC材料导电性能的影响

EFFECTS OF THERMAL TREATMENT ON PROPERTIES OF PTC CONDUCTIVE POLYMERIC COMPOSITES OF PE/CB SYSTEMS

聚合物 PTC材料在成型之后一般都要经过一定的热处理 ,热处理是改善材料性能的一种非常有效的手段 .通过开炼共混和挤出成型制得了聚合物 PTC自控温加热电缆样品 ,分别在不同的温度下进行热处理 ,考察并讨论了其导电性能在热处理过程中的变化情况 .

PTC conductive polymeric composites of PE/CB systems were prepared using melt processing mixers and were extruded over a pair of elongated substantially parallel conductors spaced apart along the longitudinal length of the cable.The effects of thermal treatment on the resistance and the stability of the conductive polymeric composites are discussed.