Abstract:The aging behaviors and mechanisms of perfluorinated elastomer (FFKM) cured by 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane (DBPMH) and triallyl isocyanurate (TAIC) in oxidation medium N2O4 were studied, and the degradation mechanism of crosslinking network was clarified by molecule structural characterization. It is found that the modulus and crosslinking density increase first and then decrease with the increasing of aging time, which indicates that the slight post curing occurs at the early stage and the degradation of crosslinking network dominates at the later stage. SEM, DMA, DSC results show that the oxidation medium at gas phase has a stronger accelerating effect on aging than that at liquid phase. FT-IR and XPS results show that the destruction happens preferentially on the TAIC crosslinking points, and the unstable carbonyl groups on the TAIC ring are prone to break in a strongly acidic environment formed by oxidized medium.