Thermal-oxidative aging performance and lifetime of hydrogenated nitrile rubber prepared by in situ hydrogenation at the latex stage

Hydrogenated nitrile rubber(HNBR)was prepared by selective hydrogenation of nitrile-butadiene rubber latex using hydrazine hydrate/hydrogen peroxide catalytic system,which effectively resolved the problems with environment pollution and high cost caused by noble metal catalyst via solution hydrogenation method.Because of the saturation of carbon-carbon double bonds after hydrogenation,HNBR presented excellent thermal-oxidative aging resistance.The thermaloxidative activation of HNBR prepared in situ was investigated by thermogravimetric analysis(TGA)and Flynn-Wall-Ozawa method.Meanwhile,the microstructure and mechanical properties of HNBR was studied during the thermal-oxidative aging process.The relationship between lifetime and aging temperature was evaluated as well as the thermal-oxidative aging coefficient of HNBR,which provided theoretical basis for the application of HNBR under the high temperature and in harsh environment.