{"title":"Competitive relationship between electrical degradation and healing in self-healing dielectric polymers","authors":"Lu Han, Jiaye Xie, Qi Li, Jinliang He","doi":"10.1049/nde2.12056","DOIUrl":null,"url":null,"abstract":"<p>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 <i>in situ</i>-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.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":null,"pages":null},"PeriodicalIF":3.8000,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12056","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IET Nanodielectrics","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1049/nde2.12056","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
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.