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Table 1 Quantum yield (Φcs) for the chain scission for PS films (40 μm) thickness with and without 0.5 (wt/wt) additive after 250 hrs irradiaton time

From: 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

Additive 0.5%(wt/wt)

Quantum yield of main chain scission (Φcs)

PS + I

3.31E-06

PS + II

4.20E-06

PS + III

5.78E-06

PS + IV

6.25E-06

PS(blank)

9.67E-05

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