Surface Tension and Wettability of CCA-Treated Red Maple


  • Debesh C. Maldas
  • D. Pascal Kamdem


Hardwood, <i>Acer rubrum L</i>, red maple, chromated copper arsenate (CCA), adhesion, wettability, phenol-formaldehyde adhesive, contact angle, critical surface tension, surface free energy, dispersion component, polar component, acid-base component, Lifshitz-van der Waal component


The wetting properties of untreated, water-extracted and chromated copper arsenate (CCA)-treated red maple were characterized by contact angle measurements. Conventional experimental and mathematical modeling were employed to evaluate the wetting parameters. Zisman's critical surface tensions, and both acid-base (γABs) and acid (γ+s) components of surface tension for CCA-treated wood do not differ much from those of untreated wood. After CCA-treatment, the dispersion (γds) and Lifshitz-van der Waal (γLWs) components of the surface tension increase while the polar (γps) and base (γ-s) components decrease. The high contact angles resulting from the water and CCA treatment of wood compared to untreated wood suggest poor wettability. CCA-treated wood wetted with phenol-formaldehyde (PF) adhesive gave contact angles greater than 90°, i.e., very poor wettability and the time to reach an equilibrium contact angle was three times longer than that for untreated wood.


Adamson, A. W. 1967. Physical chemistry of surfaces, 2nd ed. Interscience, New York, London, Sydney. 747 pp.nBarnes, H. M., A. Khouadja, and D. E. Lyon. 1996. Bending properties of treated western hemlock plywood. Int. Res. Group Wood Pres., No. IRG/WP 96-40064.nBoggio, K., and R. Gertjejansen. 1982. Influence of ACA and CCA waterborne preservatives on the properties of aspen waferboard. Forest Prod. J. 32(3):22-26.nFowkes, F. M. 1972. Donor-acceptor interactions at interfaces. J. Adhesion 4:155-159.nGardner, D. J. 1996. Application of the Lifshitz-van der Waals acid-base approach to determine wood surface tension components. Forest Prod. J. 28(4):422-428.nGardner, D. J., M. P. Wolcott, L. Wilson, Y. Huang, and M. Carpenter. 1996. Our understanding of wood surface chemistry in 1995. Pages 29-36 in A. W. Christiansen and A. H. Conner, eds. Wood adhesives 1995. Forest Product Society, Madison, WI.nGirifalco, L. A., and R. J. Good. 1957. A theory for the estimation of surface and interfacial energies. I. Derivation and application to interfacial tension. J. Phys. Chem. 61:904.nGray, V. R. 1962. The wettability of wood. Forest Prod. J. 6:452-461.nHarvey, D. J. 1962. The wetting of metals by lead alloys. Pages 148-158 in P. Weiss, ed. Adhesion and cohesion. Elsevier Publ. Co. Amsterdam, London, New York.nHerczeg, A. 1965. Wettability of wood. Forest Prod. J. 12(9):452-461.nHse, C. Y. 1972. Wettability of southern pine veneer by phenol formaldehyde wood adhesives. Forest Prod. J. 22(1):51-56.nKaelble, D. H. 1971. Physical chemistry of adhesion. Wiley-Interscience, New York, London, Syndey, Toronto. 507 pp.nLiptáková, E., and J. Kúdela. 1994. Analysis of the wood-wetting process. Holzforschung 48(2): 139-144.nMaldas, D. C., and D. P. Kamdem. 1998. Surface characterization of chromated copper arsenate (CCA)-treated red maple. J. Adhes. Sci. Technol. (in press).nMarian, J. E., D. A. Stumbo. 1962. Adhesion in wood. Part I. Physical factors. Holzforschung 16(5): 134-147.nNguyen, T., and W. E. Johns. 1978. Polar and dispersion force contributions to the total surface free energy of wood. Wood Sci. Technol. 12:63-74.nPizzi, A. 1994. Advanced wood adhesives technology. Marcel Dekker, Inc., New York, Basel, Hong Kong. 289 pp.nSumner, C. G. 1937. Symposium on detergency. Chem. Publ. Co., New York. P. 15.nSwanson, J. W., and J. J. Becher. 1966. The adhesion of polyethylene paper. Tappi 49(5): 198-202.nVan Oss, C. J., M. K. Chaudhury, and R. J. Good. 1988. Interfacial Lifshitz-van der Waals and polar interactions in macroscopic systems. Chem. Rev. 88:927-941.nVick, C. B., R. L. Geimer, and J. E. Wood. 1996. Flake-boards from recycled CCA-treated southern pine lumber. Forest Prod. J. 46(11/12):89-91.nVick, C. B., and T. A. Kuster. 1992. Mechanical interlocking of adhesive bonds to CCA-treated southern pine. A scanning electron microscopic study. Wood Fiber Sci. 24(1):36-46.nWu, S. 1971. Calculation of interfacial tension in polymer systems. J. Polym. Sci. Part C 34:19-30.nWu, S. 1982. Polymer Interfaces and Adhesion. Marcel Dekker, Inc., New York, Basel, Hong Kong. 630 pp.nWu, W., R. F. Giese Jr., and C. J. Van Oss. 1995. Evaluation of the Lifshitz-van der Waals/acid-base approach to determine surface tension components. Langmuir 11(1):379-382.nZisman, W. A. 1962. Constitutional effect on adhesion and adhesion. Pages 176-208 in P. Weiss, ed. Adhesion and cohesion. Elsevier Publ. Co. Amsterdam, London, New York.nZhang, H. J., D. J. Gardner, J. Z. Wang, and Q. Shi. 1997. Surface tension, adhesive wettability, and bond-ability of artificially weathered CCA-treated southern pine. Forest Prod. J., 47(10):69-72.n






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