Abstract
AbstractThe stereoregularity and molecular weight distribution of poly(methylmethacrylate)s prepared with phenylmagnesium bromide or diphenylmagnesium as catalyst in tetrahydrofuran/toluene mixed solvents were investigated in detail. Some of the polymers were fractionated according to molecular weight or by adsorption with silical gel and the stereoregularities of the fractions were determined. An eneidic mechanism of propropagation was proposed based on the experimental results.1H NMR spectroscopy of deuterated phenylmagnesium bromide and of its reaction with methyl methacrylate indicated that an eneidic mechanism resulted from a Schlenk type equilibrium, which is shifted to the diphenylmagnesium species at low temperatures and in nonpolar solvents.
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