Abstract
Phenyl alkyl ketone end-groups in polystyrene have been determined by quantitative phosphorescence spectroscopy. A typical commercial sample of polymer has a concentration of 0.14 carbonyl groups per number average chain. The photochemistry and emission properties of a series of samples prepared under differing oxygen partial pressures suggest that these carbonyl groups originate from in-chain peroxides. On photo-oxidation, the carbonyl concentration increases rapidly and is quantitatively related to the number of chain scissions. The mechanistic significance of these results and the temperature dependence of the formation of carbonyl groups after the low temperature photolysis of peroxides in polystyrene, are discussed.
Published Version
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