A base–conjugate-acid pair for living/controlled ring-opening polymerization of trimethylene carbonate through hydrogen-bonding bifunctional synergistic catalysis
文献信息
Xin Wang, Saide Cui, Zhenjiang Li, Suli Kan, Qiguo Zhang, Chengxu Zhao, Hao Wu, Jingjing Liu, Wenzhuo Wu, Kai Guo
The ring-opening polymerization (ROP) of trimethylene carbonate (TMC) using a base–acid binary organocatalyst system of 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (MTBD) and Brønsted acid trifluoromethanesulfonic acid (TFA) with benzyl alcohol (BnOH) as the initiator has been investigated. The MTBD and its conjugate-acid pair H-bonding bifunctional synergistic activation mechanism was demonstrated by NMR measurements, and the living/controlled nature of MTBD/TFA catalyzed ROP of TMC was confirmed by the kinetic and chain extension experiments. The controlled ROP of TMC with the optimal molar ratio of MTBD/TFA = 2/1 proceeded to afford well-defined PTMC with narrow molecular weight distributions (Mw/Mn ∼ 1.1). The molecular weights determined by 1H NMR are in precise agreement with the theoretical values. 1H NMR, SEC, and MALDI-ToF MS measurements confirmed the structure of the obtained homopolymer PTMC. In addition, a diblock copolymer consisting of poly(trimethylene carbonate) and poly(L-lactide) (PTMC-b-PLLA) was synthesized successfully by the MTBD/TFA binary catalyst system.
期刊推荐

Russian Journal of General Chemistry

Russian Journal of Bioorganic Chemistry

Acta Materialia

Current Opinion in Colloid & Interface Science

Chemical Communications

Journal of Natural Medicines

Drug Discovery Today

Russian Journal of Coordination Chemistry

Organic Process Research & Development

Current Opinion in Solid State & Materials Science
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Polymer Chemistry

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