DYE-SENSITIZED PHOTOOXIDATION OF 1,4-POLYDIENES |
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| Authors: | Jan F Rabek Bengt Ranby |
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| Institution: | Department of Polymer Technology. The Royal Institute of Technology, Stockholm. Sweden |
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| Abstract: | Abstract— The reaction of singlet oxygen with polydiene polymers produces hydroperoxides by the typical 'ene' type reaction. The observed chain scission process cannot be explained by the photodecom-position of hydroperoxide formed by visible light, because these hydroperoxides do not absorb light in this repion. Spectroscopic and EPR studies of the dye-solvent systems show the formation of reactive free radicals. which are probably responsible for the abstraction of hydrogen from the polymer molecules. The next step is the well known free radical oxidation mechanism which is responsible for the chain scission reactions. |
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