Chemical Structure and Macro Properties change of Degraded Organic Coating Films for Building Material by Photo and Thermal Reaction

Abstract

We developed the UV exposure equipment which can modify each degradation factor (UV, heat, moisture) independently. In this study, we conducted a degradation experiment in a low humidity environment for building organic coating film by using the equipment. This paper discussed a temperature dependence of the UV degradation reaction mechanism and accompanying a macro property(modulus of elasticity) change.

As a result of performing spectroscopic analysis for samples after degradation, The result shows light and heat degradation mechanisms.The light degradation mechanism acts as a cutting the chemical bond, the heat contributes to the formation of recombination between free radicals generated by the light scission.