XLPE/SiO2纳米复合材料水树枝老化特性研究  

Study on Water Tree Aging Characteristics of Crosslinked Polyethylene/Silica Nanocomposites

作　　者：寻世强 杨云梦 赵健军 李秀峰[1] 任常娥 XUN Shi-qiang;YANG Yun-meng;ZHAO Jian-jun;LI Xiu-feng;REN Chang-e(College of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China;Chongqing Taishan Cable Co.,Ltd,Chongqing 401120,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000 [2]重庆泰山电缆有限公司,重庆401120

出　　处：《塑料科技》2020年第1期33-37,共5页Plastics Science and Technology

基　　金：山东省自然科学基金面上项(ZR2019MEE100);山东省重点研发计划项目(公益类)(2017GGX20108);淄博市校城融合项目(2017ZBXC102)。

摘　　要：为研究有机化纳米SiO2对交联聚乙烯(XLPE)水树枝生长特性的影响,采用熔融共混法制备了XLPE/SiO2纳米复合材料。力学性能测试表明,纳米SiO2加入XLPE中起到物理交联点的作用,复合材料弹性模量增大,韧性增强。纳米SiO2粒子作为XLPE的成核剂起到异相成核作用,加快了总结晶速率,改善了聚合物的结晶形态。采用水针电极法对试样进行加速水树枝老化实验,偏光显微镜观察水树枝形态及生长长度,纳米SiO2含量为3%时,顺电场方向水树枝长度为260μm,减小了39.8%,垂直主电场方向水树枝长度为481μm,减小了43.4%,且水树枝生长概率下降至7.7%。In order to study the effect of organic nano-SiO2 on the growth characteristics of water trees of crosslinked polyethylene(XLPE), XLPE/SiO2 nanocomposites were prepared by melt blending method. The mechanical property tests show that the doped nano-SiO2 particles into XLPE acts as physical crosslinking points, and the elastic modulus and toughness of composites are improved. Moreover, as the nucleating agent, nano-SiO2 particles play a role of heterogeneous nucleation in XLPE, accelerate the rates of total crystallization and improve the crystalline morphology of the polymer. The water needle electrod test method was used to study the water tree aging property of pure XLPE and XLPE/SiO2 composites. The morphology and growth length of water tree were observed by polarizing microscope. When the content of nano-SiO2 is 3%, the length of water tree along the electric field is 260 μm, which decreases by 39.8%;the length of water tree perpendicular to the main electric field is 481 μm, which decreases by 43.4%, and the growth probability of water tree decreases to 7.7%.

关 键 词：交联聚乙烯 纳米SIO2 水树枝 弹性模量 结晶形态 

分 类 号：TM215[一般工业技术—材料科学与工程]