Abstract: A new Fe-Zn double metal cyanide (DMC) complex is a very effective catalyst for the ringopening polymerization of propylene oxide. With tertbutyl alcohol as the chain transfer agent, orthogonal experimental design was used to find the optimal conditions for the polymerization. The optimal conditions: temperature 100 ℃,t=6 h,w(Cat)=15 mg,w(t-BuOH)=15 mg. Polyoxyproylene diols with M_n(10000～13000)were prepared, and these polymers exhibited the narrow polydispersity (M_w/M_n≤1.30). The me chanism of polymerizationwas discussed.

Key words: double metal cyanide complex, propylene oxide, orthogonal experimental design, ring-opening polymerization