Characterizing water sorption in 100% solids epoxy coatings
Date
2013
Authors
Coniglio, N.
Nguyen, K.
Kurji, R.
Gamboa, E.
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Progress in Organic Coatings, 2013; 76(9):1168-1177
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N. Coniglio, K. Nguyen, R. Kurji, E. Gamboa
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Abstract
In the present work, water sorption kinetics and equilibrium in 100% solids epoxy coatings are investigated by immersion into distilled water baths from 20 to 85 C (absorption tests) and drying in a furnace between 60 and 85 C (desorption tests). The gravimetric liquid sorption measurements reveal a non-Fickian two-stage diffusion behaviour during both absorption and desorption. The effect of hydrothermal history was also investigated. Cycling the immersion bath temperature increases the saturation values. Alternating sorption-desorption cycles increases the speed of water movement. The hydrothermal-induced coating degradation and the sorption modes are discussed. © 2013 Elsevier B.V. All rights reserved.
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© 2013 Elsevier B.V. All rights reserved.