Synthesis of polyether and polycarbonate polyols Using Various Initiator Systems and double metal cyanide catalysts
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The double metal cyanide (DMC) materials are well-known catalyst for making polyols used in a wide range of polyurethane applications. Herein, we attempt to employ various phosphorous compounds as complexing agents (CAs) for the fabrication of highly active DMC catalysts. The resultant catalysts showed high activity for the ring-opening polymerization of propylene oxide (PO) and ε-caprolactone with the turnover frequency (calculated by mol monomer per mol Zn per minute or hour) of up to 631.4 min-1 and 108 h-1, respectively. Various initiators such as poly(tetramethylene ether) glycol, polycaprolactone, and isosorbide were employed for producing polyether polyols of tunable molecular weights of 3,600−6,600 g mol−1, narrow molecular weight distribution of 1.14−1.30. The DMC catalysts also exhibited high selectivity over copolymerization of PO and CO2 with carbonate content up to 41.3%.