锌/钴双金属氰化络合物催化环氧丙烷聚合机理

Mechanism of propylene oxide polymerization on Zn/Co double metal cyanide complex catalyst

用以二乙二醇二乙醚为有机配体的锌 /钴双金属氰化络合物进行了环氧丙烷的聚合，并用扩展 X射线精细结构分析方法研究了催化剂激活和环氧丙烷聚合过程中锌离子和钴离子的区域结构变化。结果表明，锌 /钴双金属氰化络合物催化环氧丙烷的聚合是一个活性聚合体系。在环氧丙烷聚合过程中锌离子由与 3.0个氧原子配位转变为与 5.7个氧原子配位，表明聚合活性中心为 5.0个氧原子配位的螯合锌离子。

The characteristic of polymerization of propylene oxide on double metal cyanide(DMC) complex catalyst using diethyl glycol diethyl ether as organic complex and the local structures of Zn and Co ions in the process of propylene oxide polymerization were investigated. The results showed that the polymerization of propylene oxide catalyzed by DMC catalyst was a kind of living polymerization system. The coordination number of Zn and O increased from 3.0 to 5.7 in the process of DMC catalyst activation and in propylene oxide polymerization five O atoms coordinated Zn ion could be the real active center in the process of propylene oxide polymerization.