Electron spin resonance studies on photodegradable polymers
| Autor: | John J. Windle, Bernard Freedman |
|---|---|
| Rok vydání: | 1977 |
| Předmět: |
chemistry.chemical_classification
Polypropylene Materials science Polymers and Plastics Radical General Chemistry Polymer Polyethylene Photochemistry Surfaces Coatings and Films law.invention chemistry.chemical_compound chemistry law Halogen Materials Chemistry Polystyrene Irradiation Electron paramagnetic resonance |
| Zdroj: | Journal of Applied Polymer Science. 21:2225-2229 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/app.1977.070210819 |
| Popis: | Films of polyethylene (PE), polypropylene (PP), and polystyrene (PS) containing 1% of selected halogen compounds and films without additives were UV irradiated (253.7 nm) at 77°K and their electron spin resonance (ESR) spectra compared. In each case, the spectra were characteristic of the polymer, and the presence of the additive mainly enhanced the radical yield. No signal was observed for the additives alone after irradiation, suggesting that when incorporated into the polymer, they serve as photosensitizers rather than as primary sources of free radicals in promoting photo-chemical degradation. |
| Databáze: | OpenAIRE |
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