聚乙烯/蒙脱土纳米复合材料的电老化性能  

Electrical Endurance of Polyethylene/Montmorillonite Nano-composites

作　　者：李长明[1] 李入鹏[1] 高俊国[1] 武宇波[1] 张晓虹[1] 

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150040

出　　处：《哈尔滨理工大学学报》2007年第3期152-155,共4页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金项目资助(50377009);(50677010)

摘　　要：通过试验分析了未老化和老化后纯聚乙烯和不同的聚乙烯／蒙脱土复合材料的绝缘电阻率ρv、介质损耗角正切tanδ以及击穿场强EB的性能．结果表明：聚乙烯／蒙脱土复合材料试样的tanδ温度关系与极性电介质的损耗特性相似，且试样绝缘电阻率于50～60℃温度范围内明显高于LDPE值．在电老化之前后，加入相容剂材料试样的击穿场强比LDPE试样约分别高7％、18％．热激电流（TSC）试验中，发现聚乙烯／蒙脱土纳米复合材料试样的松弛时间分布展宽，峰值增高．这是由于复合材料中引入的更多陷阱能级，调制了载流子浓度和迁移率，改善了材料的耐电老化性能．The characteristics of insulation resistivity ρv, dielectric loss factor tanδ and electrical breakdown EB are investigated for polyethylene and various polyethylene/montmorillonite composites, which are respectively unaged and aged. The test results show that in polyethylene/montmorillonite composites the dependence of tanδ on temperature is similar to that of polar dielectric, and the ρv is obviously higher than that of LDPE at 50-60℃. Before the electrical aging, breakdown strength （EB） of polyethylene/montmorillonite nanocomposites with compatilizer （ LDPE/C/O - MMT） is higher 7% than EB of LDPE, and after electrical aging, EB of LDPE/C/O - MMT is higher 18% than EB of LDPE. It can be observed in the test of thermal stimulating current （TSC） that the distributing of relax time becomes broad, the peak value increases in LDPE/C/O - MMT samples, which means that more trap levels are intruduced into nanocomposites. Theses trap levers modulate density and mobility of carriers, thus the voltage enduranc of LDPE/C/O - MMT samples is improved.

关 键 词：聚乙烯/蒙脱土纳米复合材料 绝缘电阻 TGΔ 热激电流 空间电荷 

分 类 号：TM287[一般工业技术—材料科学与工程] TM535.1[电气工程—电工理论与新技术]