Evaluation of NMR spectroscopy for the quantitative characterization of urea-formaldehyde resins |
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Authors: | Taylor R Pragnell R J McLaren J V Snape C E |
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Affiliation: | Coal Research Establishment, Stoke Orchard, Cheltenham, Glos. GL52 4RZ, England. |
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Abstract: | A comparative evaluation has been made of both proton and (13)C nuclear magnetic resonance techniques in the quantitative characterization of commercial urea-formaldehyde resins. There is good agreement between data derived from (13)C NMR spectra and from (1)H 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 (13)C and proton NMR with nitrogen analysis gives a quantitative characterization technique for these resins. |
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