Abstract
Polyisobutenes and polystyrenes with phenol end-groups may be prepared by cationic polymerization of isobutene and styrene in the presence of the appropriate phenol. Suitable initiators include stannic chloride and aluminum chloride. High proportions of phenolic end-groups are obtained with 2,6-dialkylphenols at concentrations in reaction mixtures of the order of 0.05 M. The end-groups are characterized by means of 1H and 13C NMR, u.v. and ESR of the phenoxy radicals obtained after oxidation with lead dioxide. In addition to its use in molecular weight determination, gel permeation chromatography with combined refractive index and u.v. detection gives information on the distribution of end-groups as a function of polymer molecular weight.
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