The structure of propylene oxide-ethylene oxide block copolymers prepared with the use of glycerol as an initiator and potassium monoglycerate as a catalyst was studied by NMR spectroscopy. The relative amounts of oxypropylene and oxyethylene monomer units, the functionality-type distribution, the number-average molecular mass, and the ratio between primary and secondary terminal hydroxyl groups were determined. The applicability of 1 H and 13 C NMR techniques to characterization of these copolymers is discussed. The obtained NMR data are compared with results obtained by other techniques.
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Makhiyanov et al. (2006) studied this question.
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