| 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-1,2epoxide, propylene oxide, butene oxide, octene oxide, and 1-chloro-2,3-epoxypropane were investigated in the presence of double metal cyanide catalysts (DMC). DMC catalysts were prepared by using K3Co(CN)6 and ZnX2 (X=Cl, Br, I), together with tertiary butyl alcohol and polytetramethylene ether glycol as complexing reagents. 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. |
