Abstract
AbstractMenthyl methacrylate was polymerized with phenylmagnesium bromide, n‐butyllithium, benzoyl peroxide, azobisisobutyronitrile, and γ‐rays as initiators. The polymers obtained were converted to poly(methyl methacrylate) (PMMA). From the infrared spectra and high resolution NMR spectra of PMMA derived, the stereoregularity of poly(menthyl methacrylate) (PMnMA) was estimated. PMnMA's polymerized with phenylmagnesium bromide and n‐butyllithium have an isotactic structure and those prepared with radical initiators have an atactic structure. The probability of isotactic addition σ of PMnMA polymerized with radical initiators was larger than that for PMMA. The optical activity of PMnMA increased with decreasing isotacticity, but the change is slight as compared with the variation of the stereoregularity of the polymers. It was concluded that PMnMA molecules would not form helices in solution.
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