摘要
针对高压、超高压直流输电电缆中存在空间电荷效应的现象,文中基于MgO/聚乙烯纳米复合材料,加入乙烯-醋酸乙烯共聚物(EVA)进行改性,讨论了EVA的种类及用量对复合材料空间电荷、体积电阻率及直流击穿场强的影响,并通过扫描电镜(SEM)对粒子在复合材料中的分散性进行表征。结果表明,添加VA质量分数为14%的EVA制备的纳米复合材料介电性能要好于添加VA质量分数为50%的EVA,并且此种EVA质量分数为9%时,MgO粒子尺寸为56nm^76nm,达到了纳米级分散,有效地降低了复合材料中的空间电荷密度,对复合材料的体积电阻率和直流击穿场强均有提高。
In order to suppress space charge accumulation and improve dielectric properties of high voltage（HV） and extrahigh voltage（EHV） plastic power cable,ethylene-vinyl acetate copolymer（EVA）was added into MgO/LDPE nanocomposites.The influence of EVA type and content on the space charge,volume resistivity and direct current（DC） breakdown strength were studied.The particles dispersion in nano-composites was observed by SEM.The pictures show that the dispersion of EVA containing 14% VA in nano-composites is better than that containing 50% VA.It is also showed that the size of MgO particles is nanoscale ranging from 56nm to 76nm when the mass fractin of EVA（mass fraction of VA is 14%） is 9%.With the addition of EVA and nano-MgO particles,the density of space charge in nano-composites is reduced obviously,and the volume resistivity and DC breakdown strength of the nano-composites are improved.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2013年第8期117-120,125,共5页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(50977019)
黑龙江省研究生创新项目
