Accelerated Aging Behaviors and Mechanism of Fluoroelastomer in Lubricating Oil Medium  

作　　者：Qi-Long Wang Jing-Ke Pei Gao Li Xi He Yan-Hua Niu Guang-Xian Li 

机构地区：[1]College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering of China,Sichuan University,Chengdu 610065,China

出　　处：《Chinese Journal of Polymer Science》2020年第8期853-866,I0007,共15页高分子科学（英文版）

基　　金：This work was financially supported by the Joint Foundation from Ministry of Education and Advanced Research of Equipment(No.6141A02022201);the National Natural Science Foundation of China(Nos.U19A2096,51721091);Department of Science and Technology of Sichuan Province(No.2019YFH0027).

摘　　要：The aging behaviors and mechanism of fluoroelastomer(FKM)under lubricating oil(FKM-O)and air(FKM-A,as a comparison)at elevated temperatures were studied from both physical and chemical viewpoints.The obvious changes of mechanical and swelling performances indicate that the coupling effect of lubricating oil and temperature causes more serious deterioration of FKM-O compared to that of FKM-A.Meanwhile,much stronger temperature dependence of both bulk properties and micro-structures for FKM-O is found.Three-stage physical diffusion process is defined in FKM-O due to the competition between oil diffusion and elastic retraction of network.FTIR results reveal that the dehydrofluorination reaction causes the fracture of C-F bonds and produces a large number of C=C bonds in the backbone.The coupling effect of oil medium and high temperature could accelerate the scission of C=C bonds and generate a series of fragments with different molecular sizes.The TGA results,crosslinking density Ve,and glass transition temperature Tg derived from different measurements coherently demonstrate the network destruction in the initial stage and the simultaneous reconstruction occurring at the final stage.The newly formed local network induced by reconstruction cannot compensate the break of the original rubber network and thus only provides lower tensile strength and thermal stability.

关 键 词：FLUOROELASTOMER Aging behaviors MECHANISM Lubricating oil Network reconstruction 

分 类 号：TQ333.93[化学工程—橡胶工业]