摘要
高能射线辐照会导致电容器储能介质发生交联和降解等化学变化,进而影响到电容器的宏观电气性能和应用性能。该文以双向拉伸聚丙烯(biaxially oriented polypropylene,BOPP)薄膜典型的串晶结构(shish-kebab)为对象,研究了γ辐照积累剂量D对分子链结构和结晶特性的影响,建立了辐照劣化模型。研究结果表明,当D<10 kGy时,辐照交联和降解反应同时发生且程度相当,结晶度和大分子含量均无明显变化;当D≥10 kGy时,辐照降解反应占主导,shish晶逐渐被破坏,结晶度和大分子含量逐渐下降;当D=1000 kGy时,shish-kebab结构几乎完全破坏,薄膜内主要为片晶和无定形结构。该模型描述了γ辐照下shish-kebab结构的劣化过程,为聚合物晶体结构的辐照老化机理研究提供参考。
High-energy radiation can lead to chemical changes such as cross-linking and degradation of energy storage dielectric of capacitors,which will affect the electrical performance and application of the capacitor.Taking the typical shish-kebab structure of biaxially oriented polypropylene(BOPP)film as the object,the effects of accumulated γ irradiation dose D on the molecular chain structure and crystallization characteristics are studied,and the irradiation degradation model is established.The results show that when D<10 kGy,irradiation crosslinking and degradation reactions occur simultaneously to the same extent,and the crystallinity and the content of molecules with high molecular weight do not change significantly.When D≥10 kGy,the irradiation degradation reaction is dominant,the shish structure is gradually destroyed,and the crystallinity and the content of molecules with high molecular weight decrease gradually.When D=1000 kGy,the shish-kebab structure is almost completely destroyed,and there is mainly lamellar and amorphous region in the film.The model describes the degradation process of shish-kebab structure when applying γ irradiation,providing a reference for the irradiation aging mechanism of polymer crystal structure.
作者
李化
王雨橙
王哲豪
王柯
林福昌
LI Hua;WANG Yucheng;WANG Zhehao;WANG Ke;LIN Fuchang(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(School of Electrical and Electronic Engineering,Huazhong University of Science&Technology),Wuhan 430074,Hubei Province,China;State Key Laboratory of Polymer Materials Engineering(College of Polymer Science and Engineering,Sichuan University),Chengdu 610065,Sichuan Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2024年第9期3378-3387,I0003,共11页
Proceedings of the CSEE
