Analysis of Urea-Formaldehyde Resin Curing by Nitrogen-15 Nuclear Magnetic Resonance Spectroscopy

Brendon D. Gill, MSc Thesis, University of Waikato

Natural abundance 15N NMR spectra were obtained during curing of urea-formaldehyde resins. A distinct advantage in using 15N NMR spectroscopy is the avoidance of interfering signal from fibre material added to the resin. The technique using Distortionless Enhancement by Polisation Transfer (DEPT) confers rapid acquisition times inherent to highly sensitive 1H nuclei and avoids the disadvantages from long nitrogen relaxation times and low natural abundance, The cure of the resin is observed by the loss of primary amine peaks from urea and monomethyl urea.

It is possible to follow the cure of the resin throughout a range of gel times and at a desired pH and temperature. The resin cure is seen in both the resin alone and in the presence of wood fibre. The change in cure rates is observable for water and dichloromethane extracted and the extracted fibre. Witht he exception of dichloromethane extracted fibre added to the resin the mechanism appears to be specific acid catclysed.

By itself, or coupled with other methods of analysis, this technique is a powerful method for analysing the cure of urea-formaldehyde and other amino resins.

Thesis Link
Reference Style

Journal: Journal of AOAC International
Publisher: AOAC International

Gill, B.D. (2000) Analysis of Urea-formaldehyde Resin Curing by Nitrogen-15 Nuclear Magnetic Resonance Spectroscopy. MSc Thesis, University of Waikato, 2000

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