A method of compositive characterization of Urea‐Formaldehyde (UF) adhesives has been developed by combining NMR spectroscopy and chemical analysis. Urea‐formaldehyde standard derivatives were prepared to interpret the NMR spectra of UF condensates. The synthesized standard derivatives are: monomethylol urea, dimethylol urea, monomethylolurea‐methylether, dimethylolurea‐dimethylether, methylene‐diurea, dimethylol‐oxymethylene‐diurea. The UF condensates were examined in dimethylsulfoxide d6/CaCl2 solution without any chemical pretreatments. By this method it is possible to determine the content of free methylol, methylene, and oxymethylene formaldehyde and of nonsubstituted, monosubstituted, and bisubstituted amide groups.
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Chiavarini et al. (1975) studied this question.
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