The polymerization of poly(vinyl chloride) (PVC), head‐to‐head macroradical plays an essential role in the formation of branches and the appearance of interruption processes that lead to labile unsaturated end groups. A reaction mechanism is suggested to explain these processes and the method of formation of internal double bonds as a result of transfer to polymer. The transfer to monomer can occur only by atom acceptance by the macroradical and not by the monomer giving up an atom.
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Caraculacu et al. (1978) studied this question.
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