Living ring-opening polymerization of l,l-lactide initiated with potassium t-butoxide and its 18-crown-6 complex

L. Sipos, M. Zsuga, T. Kelen

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Living polymerization of L,L-lactide initiated by potasium t-butoxide and its 18-crown-6 complex was investigated in THF solution at room temperature. The results support a reversible polymerization mechanism consisting of first order in monomer propagation and of unimolecular depropagation. The presence of 18-crown-6 has a strong MWD narrowing effect (Mw/Mn<1.2), slows down the overall rate of polymerization and gives rise to slow initiation. The polymerizations yield optically pure polymers both in the presence and absence of 18-crown-6.

Original languageEnglish
Pages (from-to)495-502
Number of pages8
JournalPolymer Bulletin
Issue number5
Publication statusPublished - Jan 1 1992


ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Polymers and Plastics
  • Materials Chemistry

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