Prabowo, Benedictus Kim, Se Yoon Choi, Dong Hoon Kim, Soo Hyun 2024-01-20T16:35:18Z 2024-01-20T16:35:18Z 2021-09-04 2011-07 0379-153X https://pubs.kist.re.kr/handle/201004/130231 For the purpose of the pre-industry production of poly (L-lactide) (PLLA) and full understanding of the supercritical polymerization system, large scale polymerization of L-lactide initiated by 1-dodecanol/stannous 2-ethyl-hexanoate (DoOH/Sn(Oct)(2)) was carried out in supercritical chlorodifluoromethane under various reaction conditions (time, temperature and pressure) and reactants (monomer and supercritical solvent) concentrations. A 3 L sized-reactor system was used throughout this study. The monomer conversion increased to 72% on increasing reaction time to 5 h. The molecular weight of PLLA product also increased to 68000 g/mol over the same period. An increase in monomer concentration resulted in a higher molecular weight, up to 144000 g/mol and 97% of monomer conversion. Raising the reaction pressure from 130 to 240 bar also resulted in an increased monomer conversion and molecular weight. To increase heat resistivity of PLLA, methanol treatment and heat-vacuum methods were evaluated. Both of them successfully improved the heat resistivity property of PLLA. English POLYMER SOC KOREA RING-OPENING POLYMERIZATION CARBON-DIOXIDE POLYMERS CHLORODIFLUOROMETHANE Scale-up Polymerization of L-Lactide in Supercritical Fluid Article 10.7317/pk.2011.35.4.284 1 POLYMER-KOREA, v.35, no.4, pp.284 - 288 POLYMER-KOREA 35 4 284 288 scie scopus kci ART001573089 000293986900002 2-s2.0-80052079395 Polymer Science Polymer Science Article RING-OPENING POLYMERIZATION CARBON-DIOXIDE POLYMERS CHLORODIFLUOROMETHANE large scale polymerization polylactide supercritical fluid