Abstract
A comparative evaluation has been made of both proton and 13C nuclear magnetic resonance techniques in the quantitative characterization of commercial urea—formaldehyde resins. There is good agreement between data derived from 13C NMR spectra and from 1H high-field continuous wave, or low-field (Fourier transform) NMR spectra. Low-field continuous wave proton spectra exhibit inferior resolution and provide inaccurate quantitative data. Combination of 13C and proton NMR with nitrogen analysis gives a quantitative characterization technique for these resins.
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