Thermal decomposition of model compounds of polyvinyl chloride. II. Gaseous thermal decomposition of unsaturated chain end model compounds

The gaseous thermal decomposition of model compounds with unsaturated chain ends which correspond to abnormal structures in polyvinyl chloride is studied. The allyl type chloride which is located in the main chain, but not at the end of polymer is more unstable than all kinds of abnormal structures present at the end of the polymer chain. Thus, it may be supposed that the sites of initiation of decomposition are formed during polymerization with chain transfer to polymer.