Stereochemistry control of the alternating copolymerization of CO2 and propylene oxide catalyzed by SalenCrX complexes

被引：95

作者：

Li, Bo ^{[1
]}

Zhang, Rong ^{[1
]}

Lu, Xiao-Bing ^{[1
]}

机构：

[1] Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116012, Peoples R China

来源：

MACROMOLECULES | 2007年 / 40卷 / 07期

关键词：

D O I：

10.1021/ma062735f

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Various poly(propylene carbonate)s (PPC)s with different head-to-tail linkages (from similar to 60% to 93%) could be synthesized by the copolymerization of racemic propylene oxide (rac-PO) and CO2 with chromium Salen complexes as catalyst. The axial X group and the Salen ligand framework of the chromium complexes and the properties of cocatalyst significantly affect stereochemistry of the resulting polymer. Continuous determination of a polymer chain end group (initiating and chain growth species) at various times was achieved by in situ electrospray ionization mass spectrometry (ESI-MS), which in combination with the terpolymerization of CO2 with R-PO and cyclohexene oxide (CHO) gave us an insight into the mechanistic understanding of CO2/PO copolymerization and polycarbonates stereochemistry control. Apart from the effect of the ligand set of the chromium Salen complexes on polymer stereochemistry, a "polymer chain-end control" mechanism also significantly affects the stereochemistry of the resulting polycarbonates.

引用

页码：2303 / 2307

页数：5

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