Impact of polar groups concentration and free volume on water sorption in model epoxy free films and coatings
By Bouvet, G.; Dang, Nguyen; Cohendoz, S.; Feaugas, X.; Mallarino, S.; Touzain, S.
Published in Progress in Organic Coatings
NULL
2016
Abstract
Abstract The water sorption characteristics have been determined for two model epoxy systems based on the {DGEBA} resin and two amine hardeners (TETA and DAMP). A particular attention was paid to the curing protocol to control the macromolecular architectures. Using FTIR, {DSC} and {DMTA} measurements, it was demonstrated that both network microstructures differ mainly in the polar groups density, the potential crosslinking nodes and the free volume. DGEBA/DAMP system presents a higher free volume fraction and a lower polar groups concentration compared to the DGEBA/TETA system. Gravimetric measurements on free films and {EIS} experiments onto coated steel Q-panels were carried out to follow the water sorption kinetics at different temperatures (30, 40, 50 and 60
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