云母/交联聚苯乙烯复合材料制备及沿面闪络性能

交联聚苯乙烯具有优异的电气性能、力学性能和可加工性能，已作为高压绝缘材料得到了重要应用。随着脉冲功率技术向小型化方向发展，对交联聚苯乙烯真空沿面闪络性能提出了更高要求。以苯乙烯为单体，二乙烯基苯为交联剂，偶氮二异丁腈为引发剂，采用超声波分散技术将不同质量分数的云母均匀分散于溶液体系中，通过原位自由基聚合制备出云母/交联聚苯乙烯复合材料。采用红外光谱、电子扫描显微镜等对材料组成和形貌进行了表征，采用短脉冲高压测试平台研究了云母对交联聚苯乙烯真空沿面闪络性能的影响。结果表明，当云母质量分数低于5%时，复合材料中云母为均匀分散状态，随着掺杂量进一步提升，出现了明显的团聚现象；当云母质量分数为3.5%~5%之间时，真空沿面闪络击穿电压和耐电寿命较交联聚苯乙烯得到了明显提升。

Preparation and flashover properties of mica/CLPS composite

Cross-linked polystyrene (CLPS) was used as high voltage insulating material for its good electrical and mechanical properties. The flashover properties should be improved along with as the miniaturization of the impulse power system. The mica/CLPS composites were in-situ prepared with styrene、divinylbenzene (DVB), azodiisobutyronitrile (AIBN) and mica powder. The mica powder was dispersed in mix liquid of the precursors of CLPS. The components and morphology of the composites were tested by FT-IR and SEM, and the influence of mica powder on the flashover properties of CLPS was tested by high voltage impulse power. The result shows that the mica powder is well dispersed in the CLPS when its mass fraction is not more than 5%, while agglomerate happens with increase of the mica powder. The flashover voltage and resistance to discharge of CLPS are greatly improved with addition of 3.5%~5% mica.