Abstract
Physical ageing of organic coatings subjected to thermal and hygroscopic cycles was investigated. The hygrothermal history can greatly affect the values of enthalpy relaxation and thermal stress. Organic coatings physically age more when the ageing temperature and/or the relative humidity are decreasing than when they are increasing. This behaviour can be explained by considering the mobility of polymer chain segments participating in physical ageing process, and the decrease in the glass transition temperature with an increase in relative humidity.
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