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
Photo-oxidation of polymers—III: Molecular weight changes in the photolysis and photo-oxidation of polystyrene
✍ Scribed by C. David; D. Baeyens-Volant; G. Delaunois; Q. Lu Vinh; W. Piret; G. Geuskens
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 530 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0014-3057
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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
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