Moisture diffusion in epoxy resins Part I. Non-Fickian sorption processes

摘要: Diffusion of water in a glassy epoxy resin has been studied by the sorption method. Film thickness scaling is used as diagnostic tool for non-Fickian processes. A sorptiondesorption cycle effectively increases preexisting free volume and renders subsequent process different from original. The effect understood considering time scale diffusion that molecular relaxation polymer network. observed an insufficiently cured caused undergoing further postcuring process. It shown oxidation during also gives rise to processes previously described literature anomalies epoxies. difference between resorption curves not irreversible damage but due reversible changes network conformations.