Enhancing surface insulation performance of insulators through copolymer coating rich in delocalized electrons

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-04-18 DOI:10.1016/j.apsusc.2025.163300

Yankun Huo , Hongjie Wang , Yajiao He , Wenyuan Liu , Changfeng Ke , Jun Cheng

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Abstract

Weak surface insulation performance of the vacuum insulators is a bottleneck problem of the large pulsed power devices. Recent studies have found that molecular group containing delocalized electrons is able to decrease the secondary electron emission yield (SEY) and increase the surface insulation performance of the vacuum insulators. Therefore, in this paper, a kind of copolymer coating consisting of dopamine and aniline is designed and in situ synthesized on the surface of alumina insulators to introduce delocalized electrons so as to improve the surface insulation performance. Influence of the different dopamine-aniline molar ratios of the copolymer coating on the SEY and surface insulation performance is studied. The results show that the copolymer coating with molar ratios of 1:1 can endow alumina insulators the lowest SEY and highest surface insulation performance than other molar ratios steadily. Further synthesizing the copolymer with dopamine-aniline molar ratios of 1:1 on the surface of several polymer insulators can also improve the surface insulation performance, which demonstrate the wide applicability of the electron-delocalized copolymer coating in improving the surface insulation performance.

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利用富含离域电子的共聚物涂层提高绝缘子表面绝缘性能

真空绝缘子表面绝缘性能弱是大脉冲功率器件的瓶颈问题。近年来的研究发现，含有离域电子的分子基团能够降低真空绝缘体的二次电子发射产率，提高其表面绝缘性能。因此，本文设计并原位合成了一种由多巴胺和苯胺组成的共聚物涂层，在氧化铝绝缘子表面引入离域电子，从而提高其表面绝缘性能。研究了共聚物涂层中不同多巴胺-苯胺摩尔比对表面绝缘性能的影响。结果表明，摩尔比为1:1的共聚物涂层能稳定地赋予氧化铝绝缘子最低的表面绝缘性能和最高的表面绝缘性能。进一步在几种聚合物绝缘子表面合成多巴胺-苯胺摩尔比为1:1的共聚物，也可以改善其表面绝缘性能，这表明电子离域共聚物涂层在改善表面绝缘性能方面具有广泛的适用性。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.