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    Author(s): Alfred W. Christiansen
    Date: 1991
    Source: Wood and fiber science. Vol. 23, no. 1 (1991): Pages 69-84
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (183 KB)

    Description

    Literature dealing with the effect of excessive drying (overdrying) on wood surface inactivation to bonding is reviewed in two parts and critically evaluated, primarily for phenolic adhesives. Part 1 of the review, published earlier, covers physical mechanisms that could contribute to surface inactivation. The principal physical mechanism is the migration to the surface ofextractives that decrease wettability. Pan II of the review considers mechanisms involving chemical reactions: reduction of wood surface strength, oxidation and pyrolysis of wood bonding sites, and chemical interference with resin cure or bonding. In those cases where extractives are not the primary cause of inactivation, oxidation or pyrolysis probably is the major cause of inactivation. Inactivation of oak and of some Southeast Asian hardwoods may be due to the acidity of extractives, but the importance ofdecreased wettability caused by extractives cannot be dismissed.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Christiansen, Alfred W. 1991. How overdrying wood reduces its bonding to phenol-formaldehyde adhesives : a critical review of the literature. Part II, Chemical reactions. Wood and fiber science. Vol. 23, no. 1 (1991): Pages 69-84

    Keywords

    Drying, inactivation, adhesive, bonding, review, extractives, mechanism, wettability, oxidation, acidity

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