Figure 1From: 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 The relationship between the carbonyl index and irradiation time for PS films (40 μm thickness) containing different additives. Concentration of additives is fixed at 0.5% by weight.Back to article page