State analysis of water in polyether-polyol by high-frequency spectroscopy

Water molecules in polyether-polyol have been analyzed by high-frequency sp ectroscopy. It has been inferred that there exist two types of H2O in polye ther-polyol. The first type are those which coordinate directly to the OH g roup at the end of the polyol chain. The frequency of the maximum absorptio n peak of these water molecules do not shift with increasing content of H2O in the high-frequency spectra; these may be referred to as non-freezable w ater. The second type are those which bond to the EO chain in the polyol. E xcess water molecules which exist near or in the neighborhood of these H2O should also be included in the second type one. The second type may be refe rred teas freezable water. These show a frequency shift which reflects the degree of restraint of H2O in the polyol.