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- W2113155943 endingPage "398" @default.
- W2113155943 startingPage "375" @default.
- W2113155943 abstract "Coating degradation mechanisms of thermoset coatings exposed to ultraviolet radiation and humidity at constant temperature are investigated. The essential processes, photoinitiated oxidation reactions, intrafilm oxygen permeability, water absorption and diffusion, reduction of crosslink density, and development of a thin surface oxidation zone are quantified and a mathematical model for degrading coatings developed. Front-tracking techniques are used to determine the rate of movement of the oxidation and ablation fronts, the positions of which define the extension of the surface oxidation zone. Three previous and independent experimental investigations with two-component, densely crosslinked, epoxy–amine model coatings were selected for verification of the mathematical model. Simulations can match and explain transient mass loss and coating thickness reduction data and are in agreement with infrared measurements of carbonyl groups formed in the surface zone. The thickness of the stable surface oxidation zone, which is established after an initial ablation lag time, is estimated by the model to 0.5–2 μm in good agreement with previous measurements. Simulated concentration profiles of active groups, oxygen, and radicals in the stable surface oxidation zone are presented and analyzed. The mathematical model can be used for obtaining a quantitative insight into the degradation of thermoset coatings and has potential, after further development, to complete commercial coatings and dynamic exposure conditions, to become a supplementing tool for predicting in-service coating behavior based on accelerated laboratory measurements." @default.
- W2113155943 created "2016-06-24" @default.
- W2113155943 creator A5022185737 @default.
- W2113155943 date "2012-01-04" @default.
- W2113155943 modified "2023-09-23" @default.
- W2113155943 title "Model-based analysis of photoinitiated coating degradation under artificial exposure conditions" @default.
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- W2113155943 doi "https://doi.org/10.1007/s11998-011-9383-5" @default.
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