A base–conjugate-acid pair for living/controlled ring-opening polymerization of trimethylene carbonate through hydrogen-bonding bifunctional synergistic catalysis

文献信息

发布日期 2014-06-27
DOI 10.1039/C4PY00773E
影响因子 5.582
作者

Xin Wang, Saide Cui, Zhenjiang Li, Suli Kan, Qiguo Zhang, Chengxu Zhao, Hao Wu, Jingjing Liu, Wenzhuo Wu, Kai Guo


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摘要

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.

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Polymer Chemistry

Polymer Chemistry
CiteScore: 8.6
自引率: 7.3%
年发文量: 457

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