Copolymerization of L-Lactide and epsilon-Caprolactone in Supercritical Fluid
- Authors
- Prabowo, Benedictus; Choi, Dong Hoon; Kim, Soo Hyun
- Issue Date
- 8월-2009
- Publisher
- SPRINGER
- Keywords
- PLCL; biodegradable; copolymer; supercritical fluid
- Citation
- MACROMOLECULAR RESEARCH, v.17, no.8, pp.575 - 579
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- MACROMOLECULAR RESEARCH
- Volume
- 17
- Number
- 8
- Start Page
- 575
- End Page
- 579
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/119603
- DOI
- 10.1007/BF03218911
- ISSN
- 1598-5032
- Abstract
- Copolymerization of L-lactide and epsilon-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 degrees 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 degrees C increased the monomer conversion as well as the poly-L-lactide-co-epsilon-caprolactone (PLCL) molecular weight. The variation oil the stannous octoate catalyst suggested that less catalyst would decrease the caprolactone content of the polymer.
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