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  1. Synthesis of phenol-urea-formaldehyde cocondensed resins from UF-concentrate and phenol

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    Author(s): Bunchiro Tomita; Mashiko Ohyama; Chung-Yun Hse
    Date: 1994
    Source: Holzforschung 48(6):522-526
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.8 MB)

    Description

    A new synthetic method to obtain phenol-urea-formaldehyde cocondensed resins was developed by reacting phenol with "UF-concentrate", which is a kind of urea-formaldehyde (UF) resin prepared with a high molar ratio of formaldehyde to urea (F/U) such as above 2.5. The products were analyzed with 13C-NMR spectroscopy and gel permeation chromatography. The ratio of cocondensation and the amount of phenol incorporated into cocondensed resins were found to increase, when the UF-concentrates were prepared under alkaline conditions. It was also found that resol-type cocondensed resins can be synthesized by alkaline treatments of the cocondensed resins which were once prepared under acidic conditions.

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    Citation

    Tomita, Bunchiro; Ohyama, Mashiko; Hse, Chung-Yun. 1994. Synthesis of phenol-urea-formaldehyde cocondensed resins from UF-concentrate and phenol. Holzforschung 48(6):522-526

    Keywords

    Phenol, urea, formaldehyde, cocondensed resins, resol, C-13 NMR, structure, GPC

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