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    Author(s): Bunichiro Tomita; Chung-Yun Hse
    Date: 1995
    Source: Japan Wood Research Society 41(3):349-354
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (980 KB)


    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.

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    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

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