借助 WAXD、SAXS、DSC等手段研究了成核剂的引入对聚乙烯 /炭黑导电复合体系的结晶行为、聚集态结构的大尺寸效应及 PTC特性的影响。结果表明 ,成核剂的引入对结晶度的影响不大 ,但却使得基体的微晶尺寸、长周期等变小 ;从而改善了导电复合物的 PTC特性 ,提高了材料的开关性能 ,并改善了阻 -温曲线的重复稳定性。 WAXD, SAXS, DSC and other means to study the nucleating agent on the polyethylene / carbon black conductive composite crystallization behavior, aggregation structure of the large size effect and PTC characteristics. The results show that the introduction of nucleating agent has little effect on the crystallinity, but the crystallite size, long period and so on of the matrix become smaller; thereby improving the PTC characteristics of the conductive composite, improving the switching performance of the material and improving Resistance - temperature curve of the repeated stability.