Anionic polymerization of L-lactide effect of lithium and potassium as counterions

László Sipos, Miklós Zsuga

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The polymerization of L-lactide was carried out with t-BuOK and t-BuOLi in the presence and absence of crown ethers. Each polymerization showed living nature only in the limited sense of having a decreasing amount of active species at high conversion. The initiator efficiency was low in each case because of the deprotonation reaction between the tert-butoxide ion and L-lactide. Although termination did not take place with lithium containing initiators to 90 % conversion, intra- and intennolecular transesterification was observed to a significant degree. With potassium containing initiators both termination and transesterification occurred.

Original languageEnglish
Pages (from-to)1269-1284
Number of pages16
JournalJournal of Macromolecular Science - Pure and Applied Chemistry
Issue number7
Publication statusPublished - Jan 1 1997


ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

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