Efficient Copolymerization of CO2 and Propylene Oxide via ZnGA/Zn-Co DMC Composite Catalysts: Synergistic Catalysis for High-Performance Polypropylene Carbonate

Polypropylene carbonate (PPC) is a biodegradable material derived from propylene oxide (PO) with the renewable resource CO2. In this study, PPC was prepared by the catalytic polymerization of CO2 with PO using a zinc glutarate/zinc cobalt double metal cyanide (ZnGA/DMC) composite catalyst prepared from two heterogeneous catalysts, zinc glutarate (ZnGA) and zinc cobalt double metal cyanide (Zn-Co DMC). High selectivity of PPC was achieved among the polymer and propylene carbonate. The prepared PPC had high molecular weight. The thermal stability of the PPC product was obviously improved by the optimization of the reaction conditions. The catalytic effect of the composite catalyst was superior to that of individual ZnGA and Zn-Co DMC, overcoming the shortcomings of those two catalysts. And the composite catalyst also stimulated some synergistic effects between the two composites, which significantly improved the catalytic effect.