The polymerization of propylene oxide by binary catalysts consisting of inorganic compounds and diethylzinc

Abstract

AbstractBy binary catalysts consisting of diethylzinc and various metal oxides (Bi2O3, MgO, CaO, BaO, etc.) or fluorides (CaF2, KF), propylene oxide was polymerized. These binary catalysts were found to give polymers of much higher molecular weights in higher yields than metal oxides or fluorides alone.It was found that the product of the intrinsic viscosity and the yield(%) of the produced polymers increased as PAULING's ionic character of the bond of metal oxide or fluoride increased.By the X‐ray diffraction spectrum and the polarization micro‐photograph the polypropylene oxide thus obtained was proved to be crystalline.