Abstract
15N n.m.r. spectra have been recorded for some urea—formaldehyde and some melamine—formaldehyde adducts and resins. For the urea—formaldehyde system, the technique can be used to distinguish between unsubstituted amino groups, secondary and tertiary amino groups carrying methyol substituents, and secondary and tertiary amino groups involved in methylene and methylene ether linkages. For the melamine—formaldehyde system, additional information is available from the aromatic azine nitrogen signals. The information available from 15N n.m.r. spectra supports and augments that from 13C and 1H spectra.
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