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Several studies have concluded that polyethylene oxide degrades though the random homolysis of the C--C and C--O bonds in the polymer backbone, via a radical chain mechanism, leading to a reduction in molecular weight (27-30).
2] (sensitized UV) the radiation promotes the homolysis of peroxide generating hydroxyl radicals.
36) present a study on light aging properties of PVC by the carboxylic ester rare earth salt and the organotin, which reveals that radicals S--R generated from homolysis of Sn-S are combined to form R-S-S-R, which is an effective decomposer of hydroperoxides.
The thermal homolysis of the initiator leads to the formation of the primary radicals.