纳米颗粒形状对线性低密度聚乙烯纳米复合介质电学性能的影响  

Influence of Nanoparticle Shape on Electrical Properties of Linear Low Density Polyethylene Nanocomposites

作　　者：黄兴溢[1] 张强[1] 江平开[1] HUANG Xingyi ZHANG Qiang JIANG Pingkai(Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, Minhang District, Shanghai 200240, Chin)

机构地区：[1]上海交通大学上海市电气绝缘与热老化重点实验室,上海市闵行区200240

出　　处：《中国电机工程学报》2016年第24期6606-6612,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51522703;51277117;51477096);国家重点基础研究发展计划项目(973项目)(2014CB239503)~~

摘　　要：初步研究了纳米颗粒的形状对纳米复合介质电学性质的影响。以不同形状的纳米氮化硼（BN）为填料,制备了填充分数介于0.5%-2.0%的线性低密度聚乙烯（LLDPE）纳米复合介质,测试了纳米氮化硼在LLDPE中的分散行为、复合介质的结晶和熔融行为、复合介质的宽频介电频谱、空间电荷行为以及直流击穿强度。结果发现,纳米氮化硼的形状对复合介质电学性质的影响在击穿强度方向尤为突出,片状纳米氮化硼复合介质的击穿强度高于LLDPE,而球状纳米氮化硼复合介质的击穿强度低于LLDPE。纳米氮化硼的形状对复合介质的结晶和熔融行为、介电常数和介电损耗角正切等的影响可以忽略。两种纳米氮化硼均可起到抑制空电荷注入的作用,且复合介质中空间电荷衰减速率降低。片状纳米氮化硼复合介质中更易积累界面电荷,导致复合介质内部出现明显的空间电荷振荡分布。This work is aimed to investigate the influence of nanoparticle shape on the electrical properties of nanocomposite dielectrics. By using boron nitride （BN） nanoparticles with different shape as nanofiller and linear low density polyethylene （LLDPE） as matrix, nanocomposites with 0.5% to 2.0% BN were prepared. The authors investigated the dispersion of BN in LLDPE, crystallization and melting behavior of the nanocomposites, broadband dielectric spectroscopy of the nanocomposites, space charge behavior and direct current breakdown strength of the nanocomposites. It was found that the shape of BN nanoparticles does affect the breakdown strength of the nanocomposites. BN nanosheets slightly increase the breakdown strength of the nanocomposites while BN nanospheres slightly decrease the breakdown strength of the nanocomposite. The shape of BN nanoparticles shows no influence on the crystallization and melting, dielectric constant and dielectric loss tangent of the nanocomposites. Both nanoparticles can suppress the space charge injection and the make the space charge decay slow in the nanocomposites. It should be noted that the BN nanosheets may affect the space charge waveform.

关 键 词：纳米复合介质 纳米颗粒形状 线性低密度聚乙烯 介电性能 空间电荷 击穿强度 

分 类 号：TM85[电气工程—高电压与绝缘技术]