Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Charles R. Frihart
    Date: 2004
    Source: Fundamentals of composite processing : proceedings of a workshop, November 5-6, 2003. Madison, WI : U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2004. General technical report FPL ; FPL-GTR-149: Pages 29-38
    Publication Series: General Technical Report (GTR)
    Station: Forest Products Laboratory
    PDF: View PDF  (7.8 MB)

    Description

    While the chemistry for the polymerization of wood adhesives has been studied systematically and extensively, the critical aspects of the interaction of adhesives with wood are less clearly understood. General theories of bond formation need to be modified to take into account the porosity of wood and the ability of chemicals to be absorbed into the cell wall. Sufficient penetration is important for good bond formation, but it is not clear whether the penetration into lumens or the cell wall is more critical. For the bond forming process, thermodynamic wetting and viscosity are critical, but viscoelastic energy dissipation is important for the debonding process. The interphase formed during bond formation should influence the bonded assembly's ability to dissipate the internal and external stress during use, but the exact relationship is not clear. Studying of the bonding and debonding processes can be broken down into examination on the millimeter, micrometer, and nanometer spatial scales. The millimeter and larger scale is what is used for typical evaluations. However, the micrometer scale plays an important role because this scale relates to the cross-sectional size of cells that are the basic structural unit of wood. In this study, models are proposed for the adhesive--wood interphase that would reduce the stress concentration between the wood and the adhesive as the dimensions of the wood vary with changes in the wood moisture content. The nanometer scale is important because it relates to the interaction of the adhesive with the wood on the scale of the cellulose fibrils and the hemicellulose and lignin domains. The internal and external forces on the adhesive wood bond vary considerably for different products, such as laminated lumber, plywood, oriented strandboard (OSB), and fiberboard. A better understanding of the critical aspects of the adhesive--wood interaction should lead to a more efficient development of improved adhesives.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Frihart, Charles R. 2004. Adhesive interactions with wood. Fundamentals of composite processing : proceedings of a workshop, November 5-6, 2003. Madison, WI : U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2004. General technical report FPL ; FPL-GTR-149: Pages 29-38

    Keywords

    Wood-adhesive interactions, bond formation

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/8424