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  1. Synthetic conditions and chemical structures of urea-formaldehyde resins. I. Properties of the resins synthesized by three different procedures

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    Author(s): Gu Ji-you; Mitsuo Higuchi; Mitsuhiro Morita; Chung-Yun Hse
    Date: 1995
    Source: Japan Wood Research Society 41(12):1115-1121
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (3.4 MB)

    Description

    The properties and chemical structures of urea-formaldehyde (UF) resins synthesized by three different procedures were investigated. The procedures employed were: 1) methylolation under the conditions of pH 8 and a formaldehyde/urea (F/U) molar ratio of 2, followed by condensation at pH 5 and by additional incorporation of urea, 2) condensation under the conditions of pH 4.5 and a F/U molar ratio of 2.5, followed by the additional incorporation of urea, 3) condensation under the conditions of pH 1 and a F/U molar ration of 3, followed by the additional incorporation of urea.

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    Citation

    Ji-you, Gu; Higuchi, Mitsuo; Morita, Mitsuhiro; Hse, Chung-Yun. 1995. Synthetic conditions and chemical structures of urea-formaldehyde resins. I. Properties of the resins synthesized by three different procedures. Japan Wood Research Society 41(12):1115-1121

    Keywords

    Urea resins, synthetic conditions, chemical structures, bonding strength, formaldehyde emission

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