Photo-oxidation of polystyrene film: 1. Photo-oxidation of polystyrene films with light absorbed by polymer
✍ Scribed by Joanna Kowal; Maria Nowakowska; Boleslaw Waligóra
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 274 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0032-3861
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The initiation of polystyrene photo-oxidation has been studied and the quantum yield of initiation (~PR') for u.v.-irradiation at 315 K in the presence of atmospheric oxygen has been found to be 10 -3. Using ESR spectra, five distinct free radicals have been found; their nature depends on the wave l
Aromatic ketones have been used to initiate the photo-oxidation of polystyrene at wavelengths > 300 nm. Quantum yields of oxygen absorption have been measured. The results indicate that only ketones with a lowest 3(n it\*) state are efficient and that hydrogen abstraction is the initial step of the
A group of twelve low-molecular-weight compounds was chosen to model the most likely carbonyl products of polystyrene photo-oxidation. Comparison of the rate of formation of long-chain photo-oxidation products was made between pure PS film and PS films containing model carbonyl compounds. The larges