Copolymerization of L-lactide and ε-caprolactone in supercritical fluid

Benedictus Prabowo, Dong Hoon Choi, Soo Hyun Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Copolymerization of L-lactide and ε-caprolactone initiated by tin (II) octoate (Sn(Oct)2) was carried out in supercritical chlorodifluoromethane (R22) with varying reaction conditions (time and temperature) and amounts of monomer and catalyst, under a pressure of 250 bar. The optimum conditions were a reaction time of 10 h and a temperature of 130 °C, which is similar to the temperature used in bulk copolymerization system. The conversion increased from 56% to 76% by increasing the reaction time from 1 to 10 h. The molecular weight also increased to 75,900 g.mol -1 over the same period, while the increased monomer concentration resulted in a high molecular weight of 86,400 g.mol-1 and a monomer conversion of 84%. Raising the reaction temperature from 90 to 130 °C increased the monomer conversion as well as the poly-L-lactide-co-ε- caprolactone (PLCL) molecular weight. The variation on the stannous octoate catalyst suggested that less catalyst would decrease the caprolactone content of the polymer.

Original languageEnglish
Pages (from-to)575-579
Number of pages5
JournalMacromolecular Research
Issue number8
Publication statusPublished - 2009 Aug


  • Biodegradable
  • Copolymer
  • PLCL
  • Supercritical fluid

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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