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A highly active double metal cyanide complex (DMC) catalyst based on Zn–Cr was successfully synthesized by ball milling, an environmentally-friendly and efficient synthetic technique. The Zn–Cr DMC showed not only high catalytic activity for the alternating copolymerization of CO2 with propylene oxide (4MPa, 70°C, 24h) and phthalic anhydride with propylene oxide (110°C, 5h), but also effectiveness...
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