Abstract
The infrared and PMR spectra of vinyl phenyl ether (VPE) polymers, prepared by the radical and cationic mechanisms, have been studied. It is shown that in cationic polymerization of VPE in addition to ordinary, linear chain growth through the double bond an anomalous propagation step occurs, involving alkylation of the benzene ring of a monomer molecule by an active centre, with migration of a proton to the double bond. It was found that VPE polymers prepared by the cationic mechanism do not contain terminal double bonds, the mechanism of chain transfer to monomer consisting in formation of macromolecules with unsaturated end groups of the chromane type. It was found that chain transfer to monomer with scission occurs, with formation of acetal fragments in the polymer obtained by the cationic mechanism. This is proved conclusively by the PMR spectra.
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