Detection of the Destruction Mechanism of Perfluorinated Elastomer(FFKM)Network under Thermo-oxidative Aging Conditions

作     者：Wen-Yue Zhuo Qi-Long Wang Gao Li Guo Yang Huan Zhang Wen Xu Yan-Hua Niu Guang-Xian Li Wen-Yue Zhuo;Qi-Long Wang;Gao Li;Guo Yang;Huan Zhang;Wen Xu;Yan-Hua Niu;Guang-Xian Li

作者机构：College of Polymer Science and EngineeringState Key Laboratory of Polymer Materials Engineering of ChinaSichuan UniversityChengdu 610065China Aerospace Research Institute of Materials&Processing TechnologyBeijing W0076China 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：2022年第40卷第5期

页      面：504-514页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financial support from the National Natural Science Foundation of China (No. 51721091) the financial supports from the National Natural Science Foundation of China (Nos. 51873125 and 52073184) Research Foundation (International Program) of Science and Technology Department of Sichuan Province (No. 2019YFH0027) 

主　　题：Perfluorinated elastomer(FFKM) Thermo-oxidative aging Destruction mechanism Crosslinking point 

摘      要：The changes of crosslinking network of perfluorinated elastomer(FFKM)cured by TAIC and DBPH under thermo-oxidative aging conditions were *** competitive processes including post-curing and network destruction occur simultaneously,which directly affect the storage modulus and crosslinking *** the increase of aging temperature,the network destruction becomes *** and XPS characterizations further reveal that the network destruction happens preferentially on the crosslink points of TAIC structure,and the post-curing is mainly caused by the decomposition of residual curing agent *** the easier breaking of TAIC structure in the crosslinking network,both the backbone and the pendent groups of FFKM itself are much more *** further figure out the destruction mechanism,TGAFTIR-GC-MS test was also conducted and a schematic degradation process of TAIC structure was *** is found that the destruction of TAIC crosslinking points happens first on the unstable exocyclic C―N bonds and the intermediate ring radicals could eventually decompose into volatile hydrogen isocyanate(HCNO)under extreme condition.