Dependence of polymer tacticity and polymerization rate on conversion, solvent, chain length in radical polymerization of captodative-substituted ethyl acetoxyacrylate

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Influence of solvents, conversion, degree of polymerization, and temperature on polymerization rate and polymer tacticity was studied in radical polymerization of captodative-substituted ethyl 2-acetoxyacrylate. It was demonstrated that the polymerization rate varied with solvents and increased with increasing molar volume of solvents and decreasing solubility of monomer. Monomer concentration also affected the polymer yield, and dilution by solvent reduced the yield. In addition, polymer tacticity also varied with solvents, degree of polymerization, temperature, and monomer-to-polymer conversion. In the polymerization in benzene at 30 °C, the isotacticity (mm) decreased significantly with the progress of polymerization, and the syndiotacticity (r) of the polymer momentary obtained was expected to increase from 5% at the beginning to ca.60% at the polymer yield of 15%. At higher temperature (100 °C), however, the isotacticity (mm) increased during the polymerization in anisole, and the isotacticity (m) was suggested to be completely attained for the polymer obtained momentarily at the polymer yield of ca.75%. The results obtained can be interpreted on the basis of the mobility of monomer and polymer.

Journal

  • Polymer Bulletin

    Polymer Bulletin 79 6547-6564, 2021-07-12

    Springer Science and Business Media LLC

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