Copolymerization of L-lactide and ε-caprolactone in supercritical fluid
- Copolymerization of L-lactide and ε-caprolactone in supercritical fluid
- 베니 프로보우; 최동훈; 김수현
- PLCL; biodegradable; copolymer; supercritical fluid; *2008년도개인평가에반영되었음
- Issue Date
- Macromolecular research
- VOL 17, NO 8, 575-579
- 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 ℃, 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 ℃ 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.
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