Competitive relationship between electrical degradation and healing in self-healing dielectric polymers

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2023-06-12 DOI:10.1049/nde2.12056
Lu Han, Jiaye Xie, Qi Li, Jinliang He
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Abstract

The concept of self-healing dielectric polymers has been heatedly discussed, with the expectation of high damage resistance and longer service time. However, there is still a lack of analysis on the competitive relationship between electrical degradation and self-healing. The authors discussed this relationship in two stages: the design of self-healing strategies and the operation of self-healing polymers. Since the requirements for excellent insulating or mechanical properties are not consistent with the demands for high self-healing capability, trade-offs are necessary during the design of self-healing polymeric systems. In the operation stage of dielectric polymers, some key factors that affect the service lifetime of non-autonomous self-healing dielectric polymers are analysed, including the efficiency and repeatability of self-healing, and the frequency of healing maintenance. For autonomous self-healing dielectrics, the simultaneous processes of ageing and healing are investigated using a self-healing epoxy resin based on microcapsules and in situ-generated radicals. A quicker recovery of insulating properties, in terms of partial discharge magnitude, was observed under appropriate healing voltages. However, the self-healing ability might vanish when the voltage was too high, verifying the competitive relationship between electrical degradation and self-healing.

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自愈介质聚合物中电降解与愈合的竞争关系
自愈介质聚合物的概念已经引起了人们的热烈讨论,人们期望它具有更高的抗损伤性和更长的使用时间。然而,对于电降解与自愈之间的竞争关系,目前还缺乏分析。作者从自愈策略的设计和自愈聚合物的操作两个阶段讨论了这种关系。由于优异的绝缘或机械性能的要求与高自愈能力的要求不一致,因此在自愈聚合物体系的设计过程中必须进行权衡。在介电聚合物运行阶段,分析了影响非自主自愈介质聚合物使用寿命的关键因素,包括自愈效率和可重复性以及自愈维护频率。对于自主自愈电介质,使用基于微胶囊和原位生成自由基的自愈环氧树脂研究了老化和愈合的同时过程。在适当的愈合电压下,就局部放电幅度而言,观察到绝缘性能的更快恢复。然而,当电压过高时,自愈能力可能会消失,从而验证了电退化与自愈之间的竞争关系。
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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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