ZnO/SiO2-modified rare-earth-metal ternary catalyst bearing quaternary ammonium salts for synthesis of high molecular weight poly(propylene carbonate)

doi:10.1016/S1872-2067(18)63012-8

Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (8): 1303-1310.DOI: 10.1016/S1872-2067(18)63012-8

• Special Column on the 15th International Conference on Carbon Dioxide Utilization (ICCDU XV) • Previous Articles Next Articles

ZnO/SiO₂-modified rare-earth-metal ternary catalyst bearing quaternary ammonium salts for synthesis of high molecular weight poly(propylene carbonate)

Ruihua Cheng, Yujie Zhou, Qiaoli Hou, Boping Liu

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2018-01-12 Revised:2018-02-27 Online:2018-08-18 Published:2018-07-04
Contact: 10.1016/S1872-2067(18)63012-8
Supported by:
This work was supported by the Pujiang Talent Projects (16PJD016).

Abstract

Abstract:

A modified rare-earth-metal catalyst system combined with quaternary ammonium salts (QASs) as cocatalysts was investigated in the alternating copolymerization of CO₂/propylene oxide (PO) to produce poly(propylene carbonate) (PPC). In the presence of ZnO/SiO₂, the ZnEt₂-glycerine-Y(CCl₃OO)₃ catalyst presented higher activity for CO₂/PO copolymerization, as well as a higher molecular weight of polycarbonate, while maintaining the high carbonate content originating from the neat ZnEt₂-glycerine-Y(CCl₃OO)₃ catalyst. In the presence of QASs bearing different halide anions (F^-, Cl^-, and Br^-), the type of the halide anion had a strong influence on the activity of the catalyst for CO₂/PO alternating copolymerization. Only tetramethylammonium fluoride (TMAF) could promote the alternating copolymerization without increasing the by-product. Combined the ZnO/SiO₂ catalyst and TMAF, the catalytic activity for CO₂/PO polymerization increased dramatically compared to the basic ternary catalyst system. The improved catalyst system produced a polymer with a high carbonate unit level equivalent to that of the polycarbonate produced by the basic ZnEt₂-glycerine-Y(CCl₃OO)₃ catalyst system.

Key words: CO₂/epoxide copolymerization, Rare-earth-metal catalyst, ZnO-modified silica gel, Quaternary ammonium salt, Molecular weight

Ruihua Cheng, Yujie Zhou, Qiaoli Hou, Boping Liu. ZnO/SiO₂-modified rare-earth-metal ternary catalyst bearing quaternary ammonium salts for synthesis of high molecular weight poly(propylene carbonate)[J]. Chinese Journal of Catalysis, 2018, 39(8): 1303-1310.

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ZnO/SiO₂-modified rare-earth-metal ternary catalyst bearing quaternary ammonium salts for synthesis of high molecular weight poly(propylene carbonate)

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