Scheme 3From: New photostabilizers for polystyrene based on 2,3-dihydro-(5-mercapto-1,3,4-oxadiazol-2-yl)-phenyl-2-(substituted)-1,3,4-oxazepine- 4,7-dione compounds Suggested mechanism of photostabilization of 1,3-Oxazepine ring as UV absorber. Back to article page