화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.42, No.2, 261-266, March, 2018
DOI10.7317/pk.2018.42.2.261  Export Citation
Ti(dibenzoylmethane)2(O-i-Pr)2 합성과 L-락티드 개환중합
Synthesis of Ti(dibenzoylmethane)2(O-i-Pr)2 and its L-Lactide Ring-Opening Polymerization
유지연, 정하영, 고영수†
  • 공주대학교 공과대학 화학공학부
Ji Yun Yoo, Hayoung Jung, and Young Soo Ko†
  • Department of Chemical Engineering, Kongju National University, 1223-24 Cheoandaero, Cheonan, Chungnam 31080, Korea
E-mail:
초록
Poly(L-lactide)(PLA) 중합용 신규 촉매를 개발하기 위하여 Ti(O-i-Pr)4와 dibenzoylmethane(dbm)을 이용,Ti(dbm)2(O-i-Pr)2 촉매를 합성하였고 PLA 중합특성을 확인하였다. Ti(dbm)2(O-i-Pr)2 촉매 PLA 중합 특성은 L-락티드/촉매 몰비 및 중합시간을 변화시키며 관찰하였다. L-락티드/촉매 몰비가 증가함에 따라 전환율과 분자량이 증가 하였다. Ti(dbm)2(O-i-Pr)2 촉매는 촉매 내 페닐기가 존재하여 중합 반응 중 락티드 삽입을 방해하기 때문에 촉매 활성이 낮은 것으로 판단된다. Benzyl alcohol을 개시제로 사용하여 중합한 결과 Ti(dbm)2(O-i-Pr)2 촉매 전환율이 대폭 감소하였다. 얻어진 중합물은 DSC, GPC를 이용하여 녹는점과 분자량을 측정하였고 1H NMR로 PLA의 분자구조를 확인하였다.
Ti(dbm)2(O-i-Pr)2 catalyst was synthesized using Ti(O-i-Pr)4 and dibenzoylmethane(dbm) to develop a catalyst for the polymerization of L-lactide. The L-lactide polymerization behaviors of Ti(dbm)2(O-i-Pr)2 catalyst was observed with varying molar ratio of L-lactide/catalyst and polymerization time. The conversion and molecular weight increased with increasing L-lactide/catalyst molar ratio. Ti(dbm)2(O-i-Pr)2 catalyst was found to have a low catalytic activity because of the presence of a phenyl group in the catalyst and interfering with the lactide insertion during the polymerization reaction. Benzyl alcohol as an initiator resulted in a significant reduction in conversion of Ti(dbm)2(O-i-Pr)2 catalyst. The molecular weight of the obtained polymer was measured by DSC and GPC, and the molecular structure of PLA was confirmed by 1H NMR.
Keywords:L-lactide;poly(L-lactide);polymerization;Ti(dbm)2(O-i-Pr)2
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