Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (7): 20240159.doi: 10.7503/cjcu20240159

• Polymer Chemistry • Previous Articles     Next Articles

Ring-opening Alternating Copolymerization of Epoxides with Dihydrocoumarin Catalyzed by Phosphazenium/Et3B Binary Catalytic System

JIANG Chunhuan, WANG Junqi, LIU Xiaoyu, YANG Ye, REN Chuanli(), LI Zhibo()   

  1. College of Chemical Engineering,College of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China
  • Received:2024-04-02 Online:2024-07-10 Published:2024-05-17
  • Contact: REN Chuanli, LI Zhibo E-mail:chuanli@iccas.ac.an;zbli@qust.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22031005)

Abstract:

The ring-opening alternating copolymerization(ROAC) of 3,4-dihydrocoumarin(DHC) with various epoxides was successfully achieved using a binary catalytic system consisting of tri[tris(dimethylamino)phosphoranylidenamino] phosphonium chloride(P4+Cl) and triethylborane(TEB). The impact of polymerization temperature and catalyst loading on the catalytic activity and selectivity of ROAC was investigated. The P4+Cl/TEB catalytic system was found to be highly efficient and controlled in the ROAC process, preventing the intramolecular transesterification. This results in polyesters with high alternating structures, controlled molecular weights, and preserved functional groups fidelity. The effectiveness of the catalyst system is supported by kinetic investigations, proton nuclear magnetic resonance(1H NMR) and size exclusion chromatography(SEC) spectra, as well as matrix-assisted laser desorption/ionization-time of flight-mass spectrometry(MALDI-TOF-MS) analysis.

Key words: Phosphazenium salt, Organocatalysis, Phenolic lactone, Ring-opening alternating copolymerization, Polyester

CLC Number: 

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