电压稳定剂修饰纳米SiO2提升低密度聚乙烯直流电气特性的研究  

Effect of Voltage Stabilizer Modified Nano-SiO2 on DC Electrical Properties of Low Density Polyethylene

作　　者：高雅涵 黄兴溢[1] 江平开[1] 闵道敏[2] 李盛涛[2] GAO Yahan;HUANG Xingyi;JIANG Pingkai;MIN Daomin;LI Shengtao(Shanghai Key Laboratory of Electrical Insulation and Thermal Aging(Shanghai Jiao Tong University),Minhang District,Shanghai 220240,China;State Key Laboratory of Electrical Insulation and Power Equipment(Xi'an Jiaotong University),Xi'an 710049,Shaanxi Province,China)

机构地区：[1]上海市电气绝缘与热老化重点实验室(上海交通大学),上海市闵行区220240 [2]电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市710049

出　　处：《中国电机工程学报》2020年第1期330-337,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51877132);国家重点基础研究发展计划项目(973项目)(2014CB2239503)~~

摘　　要：该文制备了苯偶酰型电压稳定剂和硅烷偶联剂改性的SiO2纳米粒子,与未改性的纳米粒子分别添加到低密度聚乙烯(lowdensitypolyethylene,LDPE)中,得到3种纳米复合材料。研究发现,电压稳定剂改性的SiO2纳米粒子在LDPE中的分散性最好,可提高纳米复合材料的拉伸强度和断裂伸长率。3种纳米粒子的加入均改变了LDPE样品电极附近空间电荷的极性,与纳米粒子的表面化学状态无关。表面化学状态不同的纳米粒子均可抑制LDPE中空间电荷的注入和积聚,但电压稳定剂改性的纳米SiO2在增强LDPE击穿方面效果最好,添加质量分数为1%时直流击穿场强可提高38.7%。表面电势衰减测试显示,电压稳定剂改性的纳米SiO2的加入大幅提高了纳米复合材料中的陷阱深度和密度。击穿场强增加是纳米粒子均匀分散、表面存在电压稳定剂,以及引起陷阱密度与深度增加等因素共同作用的结果。Benzil derivative voltage stabilizer modified nano-silica(SiO2-BVA),silane coupling agent modified nano-silica,nano-silica and their corresponding low-density polyethylene(LDPE)nanocomposites were prepared.It was found that among the three types of nanocomposites,SiO2-BVA shows the best dispersion and exhibits enhancement effect on the tensile strength and elongation at break of LDPE.Compared with LDPE,the polarity of the space charges near two electrodes is altered and it is not independent on the surface chemistry of the nano-silica.Each type of nano-silica can suppress the injection and build-up of the space charges in LDPE and it is also independent on the surface chemistry of the nano-silica,while SiO2-BVA shows the best enhancement effect on the direct current breakdown strength of LDPE,and the characteristic breakdown strength of the nanocomposite with 1%SiO2-BVA was increased by 38.7%in comparison with LDPE.It is suggested that the enhanced breakdown strength results from the homogeneous nano-silica dispersion,the introduced voltage stabilizer on nano-silica surface and the increased depth and density of traps in the nanocomposites.

关 键 词：低密度聚乙烯 纳米复合材料 电压稳定剂 空间电荷 击穿强度 陷阱 

分 类 号：TM215[一般工业技术—材料科学与工程]