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    Author(s): Bunchiro Tomita; Chung-Yun Hse
    Date: 1993
    Source: Mokuzai Gakkaishi 39(11):1276-1284
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.4 MB)

    Description

    The reactions of urea with polymethylolphenol mixtures in acidic states were investigated by changing the reaction condition such as the molar ratio and acidity. The cocondensates were analyzed with carbon 13 nuclear magnetic resonance (13C-NMR) spectroscopy and gel permeation chromatography(GPC). The quantity of each chemical structure in the cocondensates was normalized and represnted to phenolic (P) nuclear as the molar ratio. The ratio of urea (U) incorporated into the cocondensates, the ratios of cocondensation, and the degrees of condensations were determined as were the degrees of substitution of phenol nuclear and urea residues.

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    Citation

    Tomita, Bunchiro; Hse, Chung-Yun 1993. Syntheses and structural analyses of cocondensed resins from urea and methylolphenols. Mokuzai Gakkaishi 39(11):1276-1284

    Keywords

    Cocondensation, urea, phenol, formaldehyde, 13C-NMR.

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