Article
  • Synthesis of Ti(dibenzoylmethane)2(O-i-Pr)2 and its L-Lactide Ring-Opening Polymerization

  • Ji Yun Yoo, Hayoung Jung, and Young Soo Ko†

  • Department of Chemical Engineering, Kongju National University, 1223-24 Cheoandaero, Cheonan, Chungnam 31080, Korea

  • Ti(dibenzoylmethane)2(O-i-Pr)2 합성과 L-락티드 개환중합

  • 유지연 · 정하영 · 고영수†

  • 공주대학교 공과대학 화학공학부

Abstract

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.


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 증가하였다. 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.


Keywords: L-lactide, poly(L-lactide), polymerization, Ti(dbm)2(O-i-Pr)2

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2018; 42(2): 261-266

    Published online Mar 25, 2018

  • 10.7317/pk.2018.42.2.261
  • Received on Aug 17, 2017
  • Revised on Nov 27, 2017
  • Accepted on Jan 22, 2018

Correspondence to

  • Young Soo Ko

  • Department of Chemical Engineering, Kongju National University, 1223-24 Cheoandaero, Cheonan, Chungnam 31080, Korea

  • E-mail: ysko@kongju.ac.kr