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    Author(s): Shin-ichiro Tohmura; Chung-Yun Hse; Mitsuo Higuchi
    Date: 2000
    Source: J Wood Sci. 46:303-309
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (431 KB)

    Description

    A test method for measuring formaldehyde from urea-formaldehyde (UF) resins at high temperature was developed and used to assess the influence of the reaction pH on the formaldehyde emission and heat stability of the cured resins. Additionally, solid-state 13C CP/MAS nuclear magnetic resonance (NMR) techniques were used to investigate the structure of cured UF resins before and after high temperature heating. Formaldehyde emissions during the cure were related to the UF resins methyl0l group content. The heat stability of cured UF resins synthesized under strongly acidic conditions was much higher than that of the other resins, which were prepared in weakly acidic and alkaline media. Solid-state 13C CP/MAS NMR spectra showed that formaldehyde emission from cured UF resins after heating is mainly ascribable to decreased methyl01 groups and dimethylene ether linkages. Significantly, it was revealed that uron structures characteristically found in the cured UF resin synthesized under strongly acidic medium indicated high heat stability.

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    Citation

    Tohmura, Shin-ichiro; Hse, Chung-Yun; Higuchi, Mitsuo. 2000. Formaldehyde emission and high-temperature stability of cured urea-formaldehyde resins. J Wood Sci. 46:303-309

    Keywords

    urea-formaldehyde resin, Formaldehyde-emission, Solid-state 13C CP/MAS NMR, Heat stability

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