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

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

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

Received Date: 12 January 2018
Revised Date: 27 February 2018

Fund Project: This work was supported by the Pujiang Talent Projects (16PJD016).

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.
- CO₂/epoxide copolymerization,
- Rare-earth-metal catalyst,
- ZnO-modified silica gel,
- Quaternary ammonium salt,
- Molecular weight
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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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通讯作者: 陈斌, bchen63@163.com

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