Ionic Polymerization of α-lsopropyl-a-methylstyrene

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Abstract
The polymerization of p-isopropyl-α-methylstyrene was carried out with anionic and cationic initiators. Polymers prepared in bulk through an anionic mechanism yielded narrowly dispersed products whereas those prepared with sodium-naphthalene complex in solution as well as with cationic initiators gave broad or bimodal distributions when analyzed with gel-permeation chromatography. The presence of microgels was also detected in these latter polymers and has been attributed to chain transfer reactions leading to branching and possibly crosslinking. The comparison of the proportions of different protons in these polymers, as computed from their nuclear magnetic resonance and infrared spectra, with those obtained for a polymer of regular structure suggests that reactions originating from the isopropyl group, along with substitutions on the benzene ring, are responsible for the anomalous structures.

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