Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 51, Issue 22, Pages 4811-4818Publisher
WILEY
DOI: 10.1002/pola.26905
Keywords
carbon dioxide; copolymerization; DMC catalyst; metal-organic catalysts; organometallic catalysts; polyurethanes
Categories
Funding
- Fundamental R&D Program for Integrated Technology of Industrial Materials
- Ministry of Knowledge Economy
- Priority Research Centers Program through NRF [2012-0006687]
- MEST
- National Research Foundation of Korea [2009-0093826] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Simple mixing of H3Co(CN)(6) and ZnCl2 in methanol resulted in precipitates of [ZnCl](+)(2)[HCo(CN)(6)](2-), constituting a new type of double metal cyanide (DMC) catalyst exhibiting a high performance in carbon dioxide (CO2)/propylene oxide (PO) copolymerization. High-molecular-weight poly(propylene carbonate-co-propylene oxide)s [poly(PC-co-PO)s] (M-n approximate to 40,000) were consistently obtained with high carbonate fractions (approximate to 60 mol %) and a high selectivity (>95%) with the new type of DMC catalyst. Conventional preparation of the DMC catalyst using K3Co(CN)(6) and ZnCl2 required removing KCl through thorough washing and resulted in lower carbonate fractions (10-40 mol %), which depended on the washing conditions. Feeding hydrophobic diols such as 1,10-decanediol as chain transfer agent preserved the high carbonate fraction (approximate to 60%) and enabled precise control of the molecular weight, including preparation of a low-molecular-weight poly(PC-co-PO)-diol (M-n approximate to 2000), which was a flowing viscous liquid with a low T-g (-30 degrees C) suitable for polyurethane applications. (c) 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 4811-4818
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