Abstract
AbstractThe NMR spectra of a series of compounds were taken in order to identify the nitrogen‐containing linkages which had been considered to be present in polyurethane elastomers. It has been found that the urea, the urethane, the allophanate and the biuret can be discriminated each other by their different chemical shifts when the measurement is made in polar solvent like N,N‐dimethyl acetamide, dimethyl sulfoxide, etc. The method was further applied to the analysis of the uncured linear prepolymer prepared from polypropylene glycol and diphenylmethane‐4,4′‐diisocyanate or tolylene diisocyanate.
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