Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5210512 | Reactive and Functional Polymers | 2011 | 5 Pages |
Abstract
A series of cobalt/Schiff base complexes, (R,R)-SalenCoIIIX [Salen = N,Nâ²-bis(3,5-di-tert-butylsalicylidene)-1,2-di-phenylethylenediimine; X = OOCCF3 (1), OOCCCl3 (2), and OOCCH3 (3)], were investigated for the alternating copolymerization of carbon dioxide with racemic propylene oxide in the presence of [PPN]Cl ([PPN] = bis(triphenylphosphine)iminium). The effect of the axial group X of the complexes and the reaction conditions on the yield, the selectivity for poly(propylene carbonate) over propylene carbonate, and the polymer molecular weight for this transformation were investigated. A high molecular weight of 72.5 kg molâ1 (Mn/Mw = 1.27, yield 76%) for the copolymer was achieved.
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Authors
Hongchun Li, Yongsheng Niu,