高电压技术2023，Vol.49Issue(12)：4879-4889,11.DOI:10.13336/j.1003-6520.hve.20230098
纳米TiO2表面精准修饰对硅橡胶直流绝缘性能的影响
Influence of Precise Modification of Nano-TiO2 Surface on DC Insulation Properties of Silicone Rubber
摘要
Abstract
To investigate the influence of precise surface modification of nano TiO2 on the DC electrical properties of silicone rubber(SIR),long and short chain polydimethylsiloxane(PDMS)were grafted onto the surface of nano TiO2 with monomodal and bimodal different densities,respectively.Nano TiO2 with different grafting types were added to SIR at the same mass fraction(1％)to produce nano TiO2/SIR composite film samples.The results of thermogravimetric analysis confirmed that long and short chain PDMS were successfully grafted onto the surface of nano TiO2.The Zeta potential test results indicated that bimodal grafting of long and short chain PDMS enhanced the electrostatic repulsion between adjacent TiO2 particles.TEM observations showed that the dispersibility of nano TiO2 in SIR was greatly improved by bimodal grafting of long and short chain PDMS.The results of space charge,DC breakdown,and DC conductivity tests indicated that the group with bimodal grafting of long and short chain PDMS exhibited better suppression of injected space charge effects,higher DC breakdown field strength,and lower volume conductivity.The reason is that the increase in the effective grafting density of long and short-chain PDMS on the surface of nano-TiO2 particles will result in a denser mesh structure in the interfacial region and reduce the free volume.Additionally,the difference in surface energy between nano TiO2 and SIR is reduced,which can promote the dispersion of nano TiO2 particles in the silicone rubber matrix,en-hance the interfacial interaction between silicone rubber and nano TiO2,and thus improve the direct current insulation performance of the nano TiO2/SIR composite material.关键词
硅橡胶/双峰接枝/纳米TiO2/界面/空间电荷Key words
silicone rubber/bimodal grafting/nano TiO2/interfaces/space charge引用本文复制引用
周远翔,高德,朱小倩,张灵,黄欣..纳米TiO2表面精准修饰对硅橡胶直流绝缘性能的影响[J].高电压技术,2023,49(12):4879-4889,11.基金项目
国家自然科学基金(51977186 （）
52037009).Project supported by National Natural Science Foundation of China(51977186,52037009). （51977186,52037009）
