Abstract
The influence of both hydrothermal and physical ageing on the viscoelastic behaviour of an epoxy resin (DGEBA-MCDEA) was investigated. The samples were first immersed in distilled water and then tested on dynamic mechanical analyser all along thermal treatments. Three relaxations of epoxy networks were observed on mechanical spectra: the main relaxation (α) at higher temperatures, the secondary relaxation (β) at lower temperatures, and the intermediate ω-relaxation. As a result of the plasticization effect of water on DGEBA-MCDEA network, all viscoelastic characteristics (width, magnitude, and temperature location) of both β- and ω-relaxations were shown to be enhanced. It was also observed that bimodal β-relaxation appears unconcerned about the structural recovery following physical ageing. On the opposite, it was concluded that each step of the thermal ageing treatment induce several changes in the viscoelastic characteristics of the ω-relaxation.
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