The interplay of physical aging and degradation during weathering for two crosslinked coatings
作者： S.G. Croll , X. Shi , B.M.D. Fernando
DOI: 10.1016/J.PORGCOAT.2007.09.024
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摘要: Abstract Polymer molecular relaxation, or ‘physical aging’, is a very important influence on permeability and mechanical properties of any polymer below its glass transition. ‘Physical aging’ occurs as even an unstressed gradually relaxes towards equilibrium conformation. This the shorter term response to stress happen over periods much longer than typical cycle accelerated weathering test, thus polymeric coating may be affected by difference in frequency between natural artificial exposures, addition other factors. Further, chemical changes network caused degradation during exposure. In this investigation, purely physical aging was compared with effect concurrent measuring ‘enthalpy recovery’ relaxation at variety temperatures various stages The quite apparent both epoxy-polyamide polyester-urethane coating. Changes behaviour were different for two coatings, which points further reasons discrepancy
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