Key result
The coisotacticity parameter of methyl acrylate-styrene copolymer was independent of the polymerization process used under the described experimental conditions.
The study confirms the validity of the integrated Alfrey-Mayo model for describing the sequence distribution of methyl acrylate-styrene copolymers.
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Supports integrated Alfrey-Mayo model for sequence distribution; leaves open validation across additional systems.
Compn. and sequence distribution of Me acrylate-styrene copolymer (I) obtained by soln. polymn. could be described according to the integrated Alfrey-Mayo model. The exptl. sequence distribution, in terms of 13C NMR-detd. triad fractions of I obtained by emulsion polymn., confirmed the validity of the model calcns. used. Moreover, a comparison between the 1H NMR spectra of the emulsion copolymer and the model calcns. of the triad fractions, demonstrated that under the described exptl. conditions, the coisotacticity parameter of I was independent of the polymn. process used; i.e., s = 0.9 provided the Ito-Yamashita assignment was correct or s = 0.3 provided the alternative assignment was correct
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Mautner et al. (1978) studied this question. Polymerization process (solution vs emulsion) was evaluated. The coisotacticity parameter of methyl acrylate-styrene copolymer was independent of the polymerization process used under the described experimental conditions.
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