Abstract
Abstract Doubly labeled (3H and 14C) benzoyl peroxide has been used to study the relative incorporation of phenyl and benzoyloxy initiating radicals in PVC polymerized in bulk and over a range of monomer concentrations in dichloroethane solutions. From the results it is concluded that (a) transfer occurs between phenyl radicals and the solvent, (b) that vinyl chloride is a relatively unreactive monomer, and (c) that the main site of initiation in the earlier stages of the bulk polymerization is the continuous monomer phase. Explanations are suggested for the very high ratio of benzoyloxy to phenyl incorporation in polymers formed by polymerization of monomer dissolved in preformed PVC films and for the decreased benzoyloxy to phenyl ratio obtained with increasing initiator concentration.
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