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
โฆ LIBER โฆ
Some aspects of the long-wave photo-oxidation of polystyrenes
โ Scribed by Neil A. Weir; Peter Kutok; Kenneth Whiting
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 426 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0141-3910
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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