SEBS对交联聚乙烯的电性能及水树抑制的影响  

Effects of Styrene-B-(Ethylene-Co-Butylene)-B-Styrene on Electrical Properties and Water Tree Resistance of Cross-linked Polyethylene

作　　者：杨君胜[1] 黄兴溢[1] 汪根林[1] 刘飞[1] 江平开[1] 

机构地区：[1]上海交通大学高分子科学与工程系,上海市电气绝缘与热老化重点实验室,上海200240

出　　处：《高电压技术》2010年第4期946-951,共6页High Voltage Engineering

基　　金：国家自然科学基金(50677037)~~

摘　　要：电缆绝缘材料的抗水树性能可以通过化学改性和物理改性来提高。为此将苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(SEBS)及马来酸酐接枝的苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(SEBS-g-MA)分别与低密度聚乙烯(LDPE)进行熔融共混,经过热压成型后制得了XLPE/SEBS和XLPE/SEBS-g-MA两种交联聚乙烯共混物,研究了SEBS以及SEBS-g-MA对交联聚乙烯(XLPE)的抗水树性能的影响,结果发现SEBS与SEBS-g-MA具有良好的抗水树效果,共混物XLPE/SEBS的水树长度随着SEBS质量分数的增加而减小,共混物XLPE/SEBS-g-MA在SEBS-g-MA的质量分数为4.76%时水树的长度最短。另外还表征了XLPE/SEBS和XLPE/SEBS-g-MA共混物的形态以及介电性能,结果显示XLPE/SEBS和XLPE/SEBS-g-MA共混物具有良好的绝缘性能。Cross-linked low density polyethylene （XLPE） samples containing poly[styrene-b-（ethylene-co-butylene）-b-styrene] （SEBS） and maleic anhydride grafted SEBS （SEBS-g-MA） were prepared by melt compounding and subsequent compression molding,respectively. A series of the samples obtained were investigated through the water treeing testing. The results show that both SEBS and SEBS-g-MA can improve the water-tree resistance of XLPE. The length of water trees in XLPE/SEBS blends decreases with the increasing of SEBS content,whereas the XLPE/SEBS-g-MA blends show the best water-tree resistance as the SEBS-g-MA content is 4.76%. The samples were also evaluated by means of dielectric measurement and scanning electron microscopy （SEM） observation. It is found that SEBS and SEBS-g-MA have not significant influence on dielectric properties of XLPE.

关 键 词：聚乙烯 苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物 水树 介电常数 介电损耗 介电强度 

分 类 号：TM247[一般工业技术—材料科学与工程]