Effects of Accelerated Thermo-Oxidative Aging on Properties of a Damped-Encapsulating Epoxy Adhesive

摘要

The effects of accelerated thermo-oxidative aging treatment on structure, hardness, morphology of fractured surface, and dynamic mechanical properties of a damped-encapsulating epoxy adhesive were investigated. FT-IR indicated the formation of a small quantity of amide groups. The hardness increases rapidly at earlier stages and then tends to stabilize when the thermo-oxidative aging time is over 300 hours. SEM graphs indicated a change from some toughness to rigidity. DMA analyses revealed that the Tg of the aged samples gradually shifted to higher temperatures, the maximum value of tanδ fluctuated in a narrow range, the tanδ spectra were greatly temperature dependent, and the tanδ spectrum showed a tendency of horizontal displacement with increased thermo-oxidative aging time.