title: Evaluation of NMR spectroscopy for the quantitative characterization of urea-formaldehyde resins.
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.
authors.affiliation: Coal Research Establishment, Stoke Orchard, Cheltenham, Glos. GL52 4RZ, England.
authors.forename: R
authors.initials: R
authors.lastname: Taylor
authors.forename: R J
authors.initials: RJ
authors.lastname: Pragnell
authors.forename: J V
authors.initials: JV
authors.lastname: McLaren
authors.forename: C E
authors.initials: CE
authors.lastname: Snape