Analysis of cocondensation of melamine and urea through formaldehyde with carbon 13 nuclear magnetic resonance spectroscopy

Abstract

The ¹³C-NMR (carbon 13 nuclear magnetic resonance) spectra of urea-formaldehyde (UF) resins, melamine-formaldehyde (MF) resins, and melamine-urea-formaldehyde (MUF) cocondensed resins synthesized under various conditions were taken with a frequency of 75 MHz. The main purpose was to investigate whether or not the occurrences of cocondensation between melamine and urea through the formations of methylene or dimethylene ether linkages could be identified. The signals due to carbons of methylene linkages of UF resins were distigishable from those of MF resins. The signaled use to carbons of cocondensed methylene linkages (-NH-CH₂-NH-), in which both nitrogen atoms are secondary, were suggested to be identifiable separately from those due to UF and MF resins.

Citation

Tomita, Bunichiro; Hse, Chung-Yun. 1995. Analysis of cocondensation of melamine and urea through formaldehyde with carbon 13 nuclear magnetic resonance spectroscopy. Japan Wood Research Society 41(3):349-354