超支化聚酯改性纳米SiO<sub>2</sub>/环氧树脂的电树枝生长特性

doi:10.19595/j.cnki.1000-6753.tces.191133

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摘要为研究超支化聚酯界面修饰对纳米SiO₂/环氧树脂（EP）复合材料电树枝生长特性的影响,分别基于化学接枝与等离子体辅助接枝两种界面修饰方法,制备不同填充质量分数的纳米SiO₂/EP复合材料。利用针-板电极进行局部放电测试和电树枝实验,并观察电树枝的生长情况。结果表明：通过等离子体对纳米SiO₂表面接枝后,复合材料出现0.99~1.53eV深陷阱;填充3%时,复合材料的局部放电起始电压达到峰值14.5kV,较纯EP提高了55.9%;填充5%时,其耐电树枝性能达到最优;并且在相同填充质量分数下,其电树枝的复杂程度更高。研究发现,等离子体辅助接枝改性,提高了复合材料界面结合强度,并引入了深陷阱,进而改善了纳米SiO₂/EP复合材料电树枝生长特性。

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	杨国清
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关键词 ：超支化聚酯, 低温等离子体, 环氧树脂, 界面改性, 电树枝

Abstract：In order to study the influence of Hyperbranched Polyester interface modification on the growth characteristics of electrical tree for nano-SiO₂/EP, the nanocomposites filled with different content were prepared by chemical grafting and plasma assisted grafting. Then, the partial discharge and electrical tree development experiments were investigated by a needle-plate electrode system. Experimental results show that deep traps of 0.99~1.53eV are observed in the nanocomposites modified by plasma-assisted grafting. The partial discharge inception voltage reaches a peak value of 14.5kV at 3% filling content, which is 55.9% higher than that of pure EP. And the electrical tree resistance is optimal at 5% filling content. Moreover, the complexity of electrical tree is higher at the same filling content. This paper indicates that plasma-assisted grafting enhances the bond strength of the nanocomposites interface and introduces deep traps in the interface area, which in turn improves the electrical tree resistance of nano-SiO₂/EP.

Key words： Hyperbranched polyester low-temperature plasma epoxy resin surface modification electrical tree

收稿日期: 2019-09-02

PACS:

TM215.92

基金资助:国家自然科学基金（51707155）和西北旱区生态水利工程国家重点实验室基金（2016ZZKT-12）资助项目

通讯作者: 刘庚男,1994年生,硕士研究生,研究方向为纳米绝缘材料、高压绝缘与放电。E-mail: 815956466@qq.com

作者简介: 杨国清男,1979年生,博士,副教授,研究方向为高电压技术、电力设备在线监测技术。E-mail: yanggq@xaut.edu.cn

引用本文:

杨国清, 刘庚, 王德意, 王闯, 李嘉昕. 超支化聚酯改性纳米SiO₂/环氧树脂的电树枝生长特性[J]. 电工技术学报, 2020, 35(20): 4415-4422. Yang Guoqing, Liu Geng, Wang Deyi, Wang Chuang, Li Jiaxin. Growth Characteristics of Electric Tree for Nano-SiO₂/Epoxy Resin Modified by Hyperbranched Polyester. Transactions of China Electrotechnical Society, 2020, 35(20): 4415-4422.

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