Abstract
The UV screeners that are used to help photostabilize polymers and coatings are themselves subject to photodegradation over the course of a few years of exposure. A simple computer program has been devised to model this process. All of the chromophores of the commercially available screeners degrade, but at varying rates. The rates are highly dependent on the matrix since hydrogen bonding effects and free radicals can lead to decomposition of the screeners. Concentration seems to play no role, and hindered amine light stabilizers (HALS) stabilize the screeners only to the extent that they reduce free radical degradation of the matrix.
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