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

László Sipos, M. Zsuga

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

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
Volume34
Issue number7
Publication statusPublished - 1997

Fingerprint

Anionic polymerization
Transesterification
Lithium
Potassium
Crown Ethers
Crown ethers
Deprotonation
Living polymerization
Polymerization
Ions
dilactide

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

Cite this

Anionic polymerization of L-lactide effect of lithium and potassium as counterions. / Sipos, László; Zsuga, M.

In: Journal of Macromolecular Science - Pure and Applied Chemistry, Vol. 34, No. 7, 1997, p. 1269-1284.

Research output: Contribution to journalArticle

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