Ring-opening polymerization of L-Lactide in supercritical chiorodifluoromethane

Ji Won Pack, Soo Hyun Kim, Soo Young Park, Youn Woo Lee, Young Ha Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The ring-opening polymerization of L-lactide initiated by 1-dodecanol/stannous 2-ethylhexanoate (DoOH/Sn(Oct)2) was carried out in supercritical chlorodifluoromethane at various reaction times, pressures, and temperatures. The monomer conversion increased to ca 70 % on increasing the reaction time to 25 h. The molecular weight of the product also increased to ca 75,000 g/mol over the same period. Increasing the pressure resulted in an accelerated polymerization rate. The pressure-induced increase in the rate of L-LA polymerization can be explained by the formation of chemical bonds in the transition state, which implies the production of a transition state with a lower partial molar volume than the reactants.

Original languageEnglish
Pages (from-to)85-92
Number of pages8
JournalMacromolecular Symposia
Publication statusPublished - 2005 Apr
Externally publishedYes


  • Biodegradable
  • Kinetics
  • Poly(L-lactide)
  • Ring-opening polymerization
  • Supercritical fluid

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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