Abstract
In order to investigate the effect of alkyl substituents of α- and β-alkylstyrenes on their reactivities in the radical copolymerization, these monomers were copolymerized with acrylonitrile. Copolymerization data show that the penultimate unit effects are operative in the copolymerization. Monomer reactivity ratios were calculated using the copolymer composition equation which takes into account the penultimate unit effect. Since the magnitude of the penultimate effect is parallel to the Hancock’s constants Esc, the origin of the penultimate effect operating here seems to be of steric nature.In the case of the copolymerization of cycloalkenes with acrylonitrile, an effect which might be attributable to a further remote unit than the penultimate unit was observed.
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Y. Inaki, S. Nozakura, and S. Murahashi, to be published.
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Inaki, Y., Hirose, S., Yasufuku, K. et al. Penultimate Unit Effect in the Radical Copolymerization of α-, β-Alkylstyrenes and Cycloalkenes with Acrylonitrile. Polym J 2, 481–488 (1971). https://doi.org/10.1295/polymj.2.481
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DOI: https://doi.org/10.1295/polymj.2.481