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Abstract
Photo-degradation studied by electron spin resonance (ESR) is described. Selected polyurethane film samples were exposed to different accelerated aging environments. These included narrow-band irradiation from 340 and 313 nm UV sources, broadband irradiation from a xenon arc lamp, and elevated temperature without irradiation. The effect of oxygen was investigated. In addition, the influence of titania on free radical formation was examined. Early stage radicals were detected by generating them in the ESR cavity at −196°C. A correlation between ESR and positron annihilation spectroscopy (PAS) data is shown, which indicates that free-radical-type chemical defects may be the cause of sub-nanometer physical defects.
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