Aliphatic polycarbonate synthesis by alternating copolymerization of carbon dioxide with cyclohexene oxide using heterogeneous zinc complex

摘要

Heterogeneous double metal cyanide (DMC) catalyst was prepared by using K_3[Co(CN)_6] and ZnCl_2, together with tertiary butyl alcohol and polytetramethylene ether glycol as complexing reagents. Multi metal cyanide (MMC) catalyst was also prepared by incorporating additional K_4Fe(CN)_6 in DMC catalyst. All catalysts characterized by various spectroscopic methods were utilized for the copolymerization of cyclohexene oxide and CO_2. Both catalysts showed high activity to yield copolymers of narrow polydispersity and moderate molecular weight. MMC catalyst was much more reactive to CO_2 than DMC catalyst, resulting in higher carbonate linkage.