中国电机工程学报2024，Vol.44Issue(19)：7852-7862,中插31,12.DOI:10.13334/j.0258-8013.pcsee.231208
双重动态交联vitrimer树脂中电树枝劣化及局部放电与降解回收特性
Growth and Partial Discharge Characteristics of Electrical Treeing in Double Dynamic Cross-linked Vitrimer Resin and Its Degradation
摘要
Abstract
Constructing a dynamic reversible crosslink network of resin-based electrical materials is an important means to achieve environmental protection.Based on the theory of dynamic exchange reaction,this article introduces a transesterification accelerator,triethanolamine,and dynamic disulfide bonds into the traditional epoxy/anhydride resin system to construct a vitrimer with dual dynamic crosslinking.The pin-plate electrode model is used to study the effects of different disulfide bond contents of the resin system on their characteristics of initiation and growth of electrical tree,as well as partial discharge.Meanwhile,fractal dimensions are used to quantitatively describe the morphological characteristics of electrical treeing in different resin systems.The trap properties of vitrimers with different disulfide bond contents and their electronic orbital distribution characteristics are analyzed using surface potential decay tests and quantum chemical calculations of crosslinked structures.Results indicate that as the number of disulfide bonds in the resin system increases,the trap energy level of the resin rises;the electronic orbital energy level decreases;the initiation voltage of the electric tree shows a slight decline;and both the growth rate of the electrical tree and its fractal dimension decrease.Subsequently,through simulation of the degradation recovery experiments for wound impregnated devices,the dynamic exchange and degradation characteristics of the resin are investigated.The study reveals that the dual dynamic crosslinked network endows the resin with excellent dynamic properties,achieving efficient and non-destructive recovery of high-value internal materials.This provides novel perspectives and options for the environmental sustainability of electrical engineering materials and the recycling of decommissioned equipment.关键词
类玻璃高分子/电树枝/局部放电/陷阱能级/量子化学计算/降解回收Key words
vitrimer/electric tree branches/partial discharge/trap energy level/quantum chemistry calculation/degradation recovery分类
信息技术与安全科学引用本文复制引用
刘贺晨,孙章林,魏利伟,刘畅,刘云鹏,周松松,刘杰..双重动态交联vitrimer树脂中电树枝劣化及局部放电与降解回收特性[J].中国电机工程学报,2024,44(19):7852-7862,中插31,12.基金项目
国家自然科学基金项目(52377025). Project Supported by National Natural Science Foundation of China(52377025). （52377025）
