Journal
POLYMER
Volume 50, Issue 21, Pages 5071-5075Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2009.08.034
Keywords
Carbon dioxide; Propylene oxide; Copolymerization
Categories
Funding
- Natural Scientific Research Foundation of Tianjin [08JCBJC02500]
- State Key laboratory of Polymer Physics and Chemistry (ChangChun, China)
- Natural Science Foundation of China [20634040]
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A series of single-component cobalt salen complexes, N,N'-bis(salicylidene)-1,2phenylenediamino cobaltIII X(X = Cl (1a), Br (1b), NO3 (1c), CF3COO (1d), BF4 (le), and N3 (If)) (SalphCoX), were prepared for alternating copolymerization of carbon dioxide and propylene oxide(PO) under mild condition. The axial anion X group of the SalenphCoX played important role in tailoring the catalytic activity, polymeric/cyclic carbonate selectivity, as well as stereochemistry of carbonate unit sequence in the polymer chain. SalenphCoX with an electron-withdrawing axial X group (complex 1c) was an ideal catalyst for the copolymerization of CO2 and PO to selectively produce polycarbonate with similar to 99% carbonate linkage and over 81% head-to-tail structure. (C) 2009 Elsevier Ltd. All rights reserved.
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