| 학회 |
한국화학공학회 |
| 학술대회 |
2003년 봄 (04/25 ~ 04/26, 순천대학교) |
| 권호 |
9권 1호, p.8 |
| 발표분야 |
고분자 |
| 제목 |
초임계 클로로디플로메탄에서 L-락타이드 중합의 반응속도와 메커니즘에 관한 연구 |
| 초록 |
The ring-opening polymerization of L-Lactide (L-LA) initiated with 1-dodecanol/Sn(Oct)2 system was carried out in supercritical chlorodifluoromethane (scR22) at 110 ℃, under a pressure of 200-205 bar. 1H NMR study suggested that polymerization proceeded via a traditional coordination insertion mechanism involving tin alkoxide bond and cleavage of acyl-oxygen bond of the monomer. The polymerization is controlled as assessed by the linear relation dependence of ln([LA]0/[LA]) on polymerization time and Mn,GPC on conversion. The relative polymerization rate constants increase with increasing Sn(Oct)2 concentration and 1-dodecanol concentration, respectively. GPC analysis indicates the molecular weight distribution is bimodal, at least at certain conversion. The mechanisms of the initiation and propagation steps in scR22 are proposed. |
| 저자 |
백지원1, 김수현2, 김영하2, 이윤우2, 박수영1
|
| 소속 |
1서울대, 2한국과학기술(연) |
| 키워드 |
polymerization; l-lactide; supercritical; chlorodifluoromethane
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| E-Mail |
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| 원문파일 |
초록 보기 |
