2008•Journal of the Korean Wood Science and TechnologyRequires access
13 C-NMR Spectroscopy of Urea-Formaldehyde Resin Adhesives with Different Formaldehyde/Urea Mole Ratios
Byung‐Dae Park, Seunghwan Lee, Jong‐Young Park
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Abstract
As a part of abating formaldehyde emission of urea-formaldehyde (UF) resin adhesive, this study wasconducted to investigate chemical structures of UF resin adhesives with different formaldehyde/urea (F/U)mole ratios, using carbon-lS nuclear magnetic resonance (C-NMR) spectroscopy. UF resin adhesives weresynthesized at four different F/U mole ratios such as 1.6, 1.4, 1.2, and 1.0 for the analysis. The analysisof 'UC-NMR spectroscopy showed that UF resin adhesives with higher F/U mole ratios (i.e., 1.6 and 1.4)had two distinctive peaks, indicating the presence of dimethylene ether linkages and methylene glycols,a dissolved form of free formaldehyde. But, these peaks were not detected at the UF resins with lowerF/U mole ratios (i.e., 1.2 and 1.0). These chemical structures present at the UF resins with higher F/Umole ratios indicated that UF resin adhesive with higher F/U mole ratio had a greater contribution to theformaldehyde emission than that of lower FAJ mole ratio. Uronic species were detected for all UF resinsregardless of F/U mole ratios.