Synthesis of Ultra-Low Monol Polyether Polyols by Multi-Metal Catalysts

摘要

Polymerizations of propylene oxide (PO) have been carried out by using double metal cyanide (DMC) catalysts based on Zn_3[Co(CN)_6]_2. By using complexing agent during preparation of catalyst, the catalytic activity, initiation time, and the unsaturation level in polyether polyols could be tuned. The catalysts were characterized by x-ray photoelectron spectroscopy, infrared spectroscopy, and x-ray powder diffraction. ~(13)C NMR analysis showed that the polyols have a random distribution of the configurational sequences. The stress-strain curves of methylene diisocyanate/l,4-butanediol cured polyurethanes (PU) showed that the monol content of polyol showed a dramatic effect on the mechanical properties of PU.