• Ring-Opening Polymerization of L-lactide with Glycidol as Initiator
  • Yim JH, Kim DH, Ko YS
  • Glycidol을 개시제로 이용한 L-lactide 개환중합
  • 임진형, 김다희, 고영수
Abstract
Glycidol-poly(lactide) (Gly-PLA) were synthesized via L-lactide ring opening polymerization with glycidol as an initiator and Al(O-i-Pr)3 catalyst. The structure of Gly-PLA was analyzed and successfully confirmed by 1H NMR. The OH group of glycidol in Gly-PLA was absent according to the 1H NMR analysis, indicating that the terminal OH group of glycidol successfully served as an initiator in the L-lactide polymerization. The solution and bulk polymerizations of L-lactide with glycidol were performed to examine the effect of L-lactide/glycidol molar ratio, polymerization temperature and time on the molecular characteristics of Gly-PLA. The conversion and molecular weight increased with an increase in L-lactide/glycidol molar ratio. Gly-PLA showed the bimodal type DSC curve. The low Tm peak of low molecular weight reduced but the high Tm peak of high molecular weight increased as L-lactide/glycidol molar ratio increased.

Al(O-i-Pr)3을 촉매로 이용하고 중합 개시제로 glycidol을 사용하여 L-lactide를 개환중합하여 glycidol-poly (lactide)(Gly-PLA)를 얻었다. 1H NMR 분석 결과 glycidol의 말단에 존재하는 수산기가 Gly-PLA에는 존재하지 않았고 이를 통해 glycidol의 말단에 존재하는 OH기가 개시제의 역할을 하여 중합이 진행되었음을 확인하였다. Llactide 용액중합과 벌크중합을 진행하였으며, L-lactide/glycidol 몰비, 중합 온도와 시간에 따라 생성된 Gly-PLA의 분자특성을 관찰하였다. L-lactide/glycidol 몰비가 증가할수록 수율과 분자량은 증가하였다. 또한 L-lactide/glycidol 몰비가 증가할수록 저분자량에 해당하는 낮은 녹는점 피크는 줄어들고, 고분자량에 해당하는 높은 녹는점 피크가 증가하였다.

Keywords: L-lactide; glycidol; aluminum isopropoxide; initiator.

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This Article

  • 2013; 37(5): 606-612

    Published online Sep 25, 2013

  • Received on Mar 26, 2013
  • Accepted on Jul 16, 2013