Ring-opening polymerization of L-lactide by using sodium complexes bearing amide as catalysts in high polar solvent

Feng Jie Lai, Cheng Hsun Lee, Kuo Hui Wu, Yu Lun Chang, Yi Chun Lai, Hsuan Ying Chen, Shangwu Ding, Chian Hui Lai

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, a series of sodium complexes with amidate ligands, including sulfonamide, acylamide, and aryl carbamate, were synthesized. These sodium complexes were used as catalysts to study the L-lactide (LA) polymerization in high polar solvent (dimethyl sulfoxide: tetrahydrofuran = 1:4). Among these sodium complexes, CTolOMe-Na (5) exhibited the highest catalytic activity (10 s, conversion > 99% with the ratio [LA]:[CTolOMe-Na (5)]:[BnOH] = 800:1:120, [CTolOMe-Na (5)] = 1.25 mM at 0 °C) and controllability (Đ = 1.10). To prove that CTolOMe-Na (5) can polymerize LA with special initiators in polar solvent, 1,4-benzenedimethanol and pentaerythritol were used as initiators in LA polymerization. The polymerization results revealed that end-chain-modified poly(lactides) with a precise molar mass (MnGPC: 3000–8800) and narrow dispersity (1.04–1.28) can be synthesized.

Original languageEnglish
Pages (from-to)2813-2827
Number of pages15
JournalPolymer Bulletin
Volume78
Issue number5
DOIs
StatePublished - May 2021

Keywords

  • L-lactide
  • Ring-opening polymerization
  • Sodium complex

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