天然橡胶复合材料极端工况下的磨耗行为及对后续光氧老化的影响  

Abrasion Behavior of Natural Rubber Composites Under Extreme Conditions and Its Effect on Subsequent Photo-oxidation Aging

作　　者：黄旭 陈翔飞 吕亚栋[1] 李光宪[1] 黄亚江[1] Xu Huang;Xiangfei Chen;Yadong Lü;Guangxian Li;Yajiang Huang(College of Polymer Science and Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学高分子科学与工程学院,四川成都610065

出　　处：《高分子材料科学与工程》2021年第9期99-108,共10页Polymer Materials Science & Engineering

基　　金：国家自然科学基金重大项目(51790504)。

摘　　要：航空轮胎起降时工况极端严苛,日常停放时又会受到热、光和氧的老化作用,2种工况交替作用会加速轮胎失效、严重影响飞机服役安全。文中采用摩擦磨损试验机考察了天然橡胶复合材料在极端工况下的动态磨耗行为,并研究了磨耗损伤对后续光氧老化的影响。扫描电镜、热分析、衰减全反射傅里叶变换红外光谱和交联密度等测试结果表明,磨耗会导致样品摩擦表面严重损伤,破坏橡胶分子主链和交联结构,破坏防老剂,使热分解活化能降低;同时,磨耗引入的样品表面损伤会显著加速后续光氧老化,导致样品表面产生更多的裂纹、氧化产物含量远高于未磨耗样品。The working conditions of aircraft tires during take-off and landing are extremely severe and usually involve various aging factors such as heat,light and oxygen during daily parking.The alternation of different working conditions will accelerate the failure of tires and seriously threaten the safety of aircraft.In this paper,the dynamic wear behavior of natural rubber composites under extreme conditions was investigated by Tribo-Lab wear tester,and the effect of initial wear damage on the subsequent photo-oxidation aging was studied.The results of SEM,thermal analysis,FT-IR-ATR and cross-linking density show that the friction surface of the samples is seriously damaged by abrasion.The cross-linking structure of rubber molecules and the antioxidant are destroyed during abrasion.As a result,the activation energy of thermal decomposition is decreased.It is found that the surface damage of the samples induced by abrasion will significantly accelerate the subsequent photo-oxidation aging,resulting in more cracks on the sample surface,and the content of oxidative products is much higher than that of the unworn sample.

关 键 词：天然橡胶 极端工况 动态磨耗 光氧老化 

分 类 号：TQ332[化学工程—橡胶工业]