Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Copolymerization of L-Lactide and ${\varepsilon}$-Caprolactone in Supercritical Fluid

  • Prabowo, Benedictus (Biomaterials Research Center, Korea Institute of Science and Technology, Department of Chemistry, Korea University) ;
  • Choi, Dong-Hoon (Department of Chemistry, Korea University) ;
  • Kim, Soo-Hyun (Biomaterials Research Center, Korea Institute of Science and Technology)
  • Published : 2009.08.25
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Abstract

Copolymerization of L-lactide and s-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 $^{\circ}C$, 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 $^{\circ}C$ increased the monomer conversion as well as the poly-L-lactide-co-${\varepsilon}$-caprolactone (PLCL) molecular weight. The variation on the stannous octoate catalyst suggested that less catalyst would decrease the caprolactone content of the polymer.

Keywords

References

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