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This paper presents the accelerated ageing test results of a durability study on polyester and analyses the ageing mechanism of this material. Pure resin specimens were cast and exposed in a xenon arc lamp ageing cell or a thermooxidation ageing cell, or were subjected to natural exposure ageing in the western China exposure zone. The chemical groups, morphology, Yellowness Index (YI), gloss, and mechanical performances of the specimens have been investigated. The results showed that the specimens turned yellow, some cracks appeared on their surfaces, and their mechanical strengths first increased and then decreased during the course of ageing. In the early stages of the ageing period, the polyester undergoes post-cure and physical ageing, whereas after a longer ageing period it undergoes some degree of degradation under the synergistic impact of UV, high temperature, and O2. The main influencing factor leading to the failure of the polyester is UV irradiation. © 2010 WIT Press.

Ageing mechanism ofortho-phthalic anhydride unsaturated polyester resin