Influence of Precise Modification of Nano-TiO2 Surface on DC Insulation Properties of Silicone Rubber

被引：0
|
作者：
Zhou Y. [1 ,2 ]
Gao D. [1 ]
Zhu X. [2 ]
Zhang L. [2 ]
Huang X. [2 ]
机构：
[1] The Wind Solar Storage Division of State Key Laboratory of Control and Simulation of Power System and Generation Equipment, School of Electrical Engineering, Xinjiang University, Urumqi
[2] State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing
来源：
Gaodianya Jishu/High Voltage Engineering | 2023年 / 49卷 / 12期
基金：
中国国家自然科学基金;
关键词：
bimodal grafting; interfaces; nano TiO2; silicone rubber; space charge;
D O I：
10.13336/j.1003-6520.hve.20230098
中图分类号：
学科分类号：
摘要：
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, enhance the interfacial interaction between silicone rubber and nano TiO2, and thus improve the direct current insulation performance of the nano TiO2/SIR composite material. © 2023 Science Press. All rights reserved.
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页码：4879 / 4889
页数：10
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