多金属氰化络合物催化环氧丙烷的聚合

Polymerization of Propylene Oxide by Using Multi-metal Cyanide Based Catalyst

用多金属氰化络合物（MMC）催化环氧丙烷开环均聚，考察了酸及起始剂对聚合诱导期的影响，以及转化单体／起始剂摩尔比、酸用量、加料方式及催化剂等对聚合物相对分子质量及其分布的影响。并用FHR、^1HNMR、SEC-MALLS对聚合产物结构进行了表征。结果表明，以MMC为催化剂，在w（H2SO4）〈5×10^-5、温度130℃、连续加料、w（MMC）〉1×10^-4时，所合成聚醚相对分子质量分布较窄（Mw／Mn=1．1～1．2），且相对分子质量可控；FTIR、^1HNMR及SEC-MALLS分析结果表明，所合成聚醚具有预期结构。实验发现，聚合反应体系只存在一种活性中心，其机理可能为配位阳离子聚合。

Polymerization of propylene oxide （PO） was carried out by using a multi-metal cyanide based catalyst. The molecular weight of the polymer synthesized can be effectively controlled by monomer/initiator molar ratio （M/I）. The result showed that the relative macromoleeular mass of the polyether possesses a narrow relative molecular mass distribution （ 1.1 - 1.2） under the condition of sulfuric acid concentration[ w（H2SO4） 〈 5 × 10^-5] with a continuous monomer feeding process and a higher catalyst concentration [w（MMC） 〉 1 × 10^-4] at 130 ℃. The macromoleeular structure of the polyether was characterized by FFIR, SEC-MALLS and ^1HNMR, and it is suggested that the polymerization is probable to follow a coordination cation mechanism.