| 초록 |
Ring-opening of propylene oxide(PO) and three kinds of cyclic anhydrides, which stand for aliphatic anhydride, aromatic anhydride, and anhydride containing double bond : succinic anhydride(SA), phthalic anydride(PA), and maleic anhydride(MA) was successfully carried out by using double-metal cyanide(DMC) based on Zn3[Co(CN)6]2. The structure of copolymer was characterized with IR and NMR. Number-average molecular weight(Mn) and molecular distribution (MWD) of copolymer were measured by GPC. The results showed that the mechanical properties of three polyetherester polyols are different based on their composition and molar ratio. |
