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    Author(s): Charles B. Vick; E. Arnold Okkonen
    Date: 2000
    Source: Forest products journal. Vol. 50, no. 10 (Oct. 2000).:p. 69-75 : ill.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (305 KB)

    Description

    In a previous study on the strength and durability of a new class of wood adhesives called one-part polyurethanes, four commercial one-part polyurethanes, along with a resorcinol-formaldehyde adhesive representing a standard of performance, were compared in bonds to yellow birch and Douglas-fir in a series of industry-accepted tests (7). The polyurethanes all performed essentially the same: high in dry and wet strength but low in wet wood failure and resistance to delamination. In the study described in this paper, we look at improving the durability of polyurethane bonds to wood by priming before bonding with a hydroxymethylated resorcinol (HMR) coupling agent that is known to enhance adhesion of all thermosetting wood adhesives. The HMR dramatically increased the wet wood failure and resistance to delamination of polyurethanes that were found deficient in the previous study, to levels comparable with the highly durable resorcinol adhesive. One-part polyurethane adhesives met the strength and durability requirements of the most rigorous of tests, specifically American Society for Testing and Materials (ASTM) standard D 2559 (3), when wood surfaces were primed with the HMR coupling agent.

    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

    Vick, Charles B.; Okkonen, E. Arnold. 2000. Durability of one-part polyurethane bonds to wood improved by HMR coupling agent. Forest products journal. Vol. 50, no. 10 (Oct. 2000).:p. 69-75 : ill.

    Keywords

    Pseudotsuga menziesii, Betula alleghaniensis, Polyurethanes, Adhesives., Glued joints, Joints (timber), Durability, Strength testing, Failure, Formaldehyde, Resorcinols, Hydroxymethylated resorcinol (HMR), Delamination, Cou

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