Chinese Journal of Applied Chemistry

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Zeolitic Imidazolate Framework-67 Efficiently Catalyzes the Ring-Opening Polymerization of L-Lactide

ZHU Chenyanga,LUO Zhixiongb,CHEN Chengb,Chaemchuen Somboonab,Verpoort Francisab*()   

  1. aSchool of Materials Science and Engineering
    bState Key Laboratory of Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China
  • Received:2018-12-14 Published:2019-04-01
  • Contact: Verpoort Francis
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21850410449)

Abstract:

To explore the metal effecting in structure of zeolitic imidazolate frameworks(ZIFs) influenced to its catalytic activity, we have synthesized ZIF-8, Zn/Co-ZIF and ZIF-67 by room temperature method and applied them as catalysts for the bulk ring-opening polymerization of L-lactide. Under the same reaction condition, ZIF-67 shows the highest catalytic activity. Compared to 2-methylimidazolate(linker) as a catalyst under the same reaction condition, the poly(lactic acid) obtained with ZIF-67 has highly isotactic structure. In addition, the matrix assisted laser desorption ionization-time of flight(MALDI-TOF) mass spectrum indicate that the poly(lactic acid) obtained with ZIF-67 has an almost linear structure. ZIF-67 can be reused for three times without significantly loss of catalytic activity.

Key words: ring-opening polymerization, poly(lactic acid), zeolitic imidazolate framework-67, heterogeneous catalysis