Journal
COLLOID AND POLYMER SCIENCE
Volume 291, Issue 9, Pages 2181-2189Publisher
SPRINGER
DOI: 10.1007/s00396-013-2957-2
Keywords
Biodegradable; Carbon dioxide; Copolymerization; Polycarbonates; Poly(cyclohexene oxide)
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Funding
- Young Scientists Fund of the National Natural Science Foundation of China [51003051]
- Science-Technology Foundation for Middle-Aged and Young Scientist of Shandong Province, China [BS2011CL021]
- High-level Talent Initial Funding for Scientific Research of Qingdao Agricultural University [630924]
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A series of Co-III carboxylate based upon N,N,O,O-tetradentate Schiff base ligand framework have been prepared. X-ray diffraction analysis confirms that these Schiff base Co-III carboxylate are all monomeric species with a six-coordinated central Co in their solid structures. The activities and polycarbonate selectivity of these complexes toward the copolymerization of epoxide (cyclohexene oxide and propylene oxide) and carbon dioxide have been investigated in the presence of bis(triphenylphosphine)iminium chloride. Copolymerization experiments indicate that [bis(alpha-methyl-3,5-di-tertbutyl-salicylaldehyde) ethylenediiminato] (CoOOCH3)-O-III exhibits the highest activity and polycarbonate selectivity among these Co-III carboxylate. The resultant copolymer contained almost 100 % carbonate linkages with the molecular weight up to 71.8 kg mol(-1) as well as narrow polymer dispersity index (polymer dispersity index = 1.5). The substituents and the mode of the bridging part between the two nitrogen atoms both exert significant influences upon the progress of the copolymerizations, influencing both the polycarbonate selectivity and the rate of copolymerization.
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