Abstract
An attempt was made to establish a general theory for the determination of sequence distribution of bi-component copolymers, in which both monomer units each have the possibility of yielding stereoregular homopolymer sequences, assuming that the propagation reaction is explained by probability statistics. Here, the stereoregularity (i.e., cotacticity) of copolymer sequence and its correlations (if any) against copolymer sequence were properly taken into account. The theory was successfully applied to explain the cotacticity of ten acrylonitrile/methacrylonitrile copolymer samples, prepared by radical polymerizations with a redox catalyst, and by anionic polymerizations with organometallic catalyst at lower and higher temperatures. The most adequate statistical models to describe triad sequence distributions, evaluated from 13C NMR spectrum of these polymers, were determined by generalizing Kamide et al. method [Polym. J., 17, 1291 (1985)], used originally for analysis of the stereoregularity of polyacrylonitrile.
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Kamide, K., Hisatani, K. Sequence Distribution of Acrylonitrile/Methacrylonitrile Copolymers. Polym J 24, 1377–1395 (1992). https://doi.org/10.1295/polymj.24.1377
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DOI: https://doi.org/10.1295/polymj.24.1377