| 초록 |
As means of the chemical fixation of carbon dioxide and the synthesis biodegradable polycarbonates, alternating copolymerizations of carbon dioxide with various epoxides such as cyclohexene oxide, cyclopetene oxide, 4-vinyl-1-cyclohexene-1,2 epoxide and propylene oxide were investigated in the presence of multi and double metal cyanide catalyst (MMC and DMC). DMC catalysts were prepared by using K3Co(CN)6 and ZnCl2 together with tertiary butyl alcohol and polytetramethylene ether glycol as complexing reagents. MMC catalyst was also prepared by incorporating additional K2Ni(CN)4 in DMC catalyst. All catalysts characterized by various spectroscopic methods were utilized for the copolymerization of epoxides and CO2. All catalysts showed high activity to yield copolymers of narrow polydispersity and moderate molecular weight. MMC catalyst was much more reactive to CO2 than DMC catalyst, resulting in higher carbonate linkage. |
