Journal
POLYMER
Volume 50, Issue 2, Pages 441-446Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2008.11.008
Keywords
Carbon dioxide; Propylene oxide; Alternating copolymerization
Categories
Funding
- National Natural Science Foundation of China [20774092, 50733003]
- National Fund for Distinguished Young Scholars [50425309]
- Chinese Academy of Sciences [KGCX-YW-208]
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A series of chromium/Schiff base complexes N,N'-bis(salicylidene)-1,2-phenylenediamino chromium(III) X were prepared and employed for the alternating copolymerization of carbon dioxide with racemic propylene oxide in the presence of (4-dimethylamino)pyridine. The effect of the complex structure and reaction conditions on the catalytic activity, the poly(propylene carbonate)/cyclic carbonate (PPC/PC) selectivity, and the polymer head-to-tail linkages was examined. The experiments indicated that N,N'-bis(3,5-di-tert-butylsalicylidene)-1,2-phenylenediamino chromium(III) (NO3) exhibited the highest PPC/PC selectivity as well as polymer head-to-tail linkages and N,N'-bis(3,5-dichlorosalicylidene)-1,2-phenylenediimino chromiu(III) (NO3) possessed the highest catalytic activity among these chromium/Schiff base complexes. The structure of the produced copolymer was characterized by the IR, H-1 NMR, and C-13 NMR measurements. Almost 100% carbonate content of the resulting polycarbonate were obtained with the help of these effective catalyst systems under facile conditions. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
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