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<p>The copolymerization of epoxides and carbon dioxide under the action of (salen)-cobalt(<span>iii</span>) complexes and ammonium or phosphonium salts often results in the formation of polycarbonates with a bimodal molecular weight distribution. A method was proposed for preparing poly(propylene carbonate) with a unimodal molecular weight distribution due to the use of coordinating additives: water and alcohols. Possible reasons for the observed effects and the polymerization mechanism are discussed.</p>

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Salen cobalt complexes in polycarbonate synthesis: bimodal versus unimodal molecular weight distribution

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • S. A. Rzhevskii,
  • O. V. Shurupova,
  • M. A. Topchii,
  • A. F. Asachenko,
  • A. V. Plutalova,
  • I. P. Beletskaya,
  • E. V. Chernikova

摘要

The copolymerization of epoxides and carbon dioxide under the action of (salen)-cobalt(iii) complexes and ammonium or phosphonium salts often results in the formation of polycarbonates with a bimodal molecular weight distribution. A method was proposed for preparing poly(propylene carbonate) with a unimodal molecular weight distribution due to the use of coordinating additives: water and alcohols. Possible reasons for the observed effects and the polymerization mechanism are discussed.