Factors influencing timber gluability with one-part polyurethanes – studied with nine Australian timber species
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Petri Widsten
Abstract
The bulk and surface properties of blocks of nine Australian wood species of commercial importance were investigated to elucidate the factors affecting timber gluability with structural one-component polyurethane adhesives. Cross-lap joints were prepared from freshly sanded blocks and the joints were subjected to creep loading in a condensing humidity environment. The median tensile strength (MTS) of the joints was found to improve with decreasing phenolic extractives content, lower timber density and decreasing lipophilic surface extractives content. The latter was assessed from O/C atomic ratios of the timber surfaces determined by X-ray photoelectron spectroscopy (XPS). The content of bulk lipophilic extractives and lignins and wettability of the surface as determined by the sessile drop method did not reveal significant correlations with the adhesion properties. The adhesion tests indicated significant gluability differences between the species investigated.
References
Back, E.L. (1987) Oxidative activation of wood and paper surfaces for bonding and for paint adhesion. Nordic Pulp Pap. Res. J.2(Special Issue):53–62.Search in Google Scholar
Back, E.L. (1991) Oxidative activation of wood surfaces for glue bonding. For. Prod. J. 41:30–36.Search in Google Scholar
Bootle, K.R. Wood in Australia. MacGraw-Hill, Australia, 1983.Search in Google Scholar
Cerra, A.P. (1995) Development of a new accelerated adhesion test for silicone sealants. J. Test. Eval.23:370–376.Search in Google Scholar
Conde, E., Cadahía, E., García-Vallejo, M.C., Tomás-Barberán, F. (1995) Low molecular weight polyphenols in wood and bark of Eucalytus globulus. Wood Fiber Sci.27:379–383.Search in Google Scholar
Finney, D.J. Probit Analysis, 3rd ed. Cambridge University Press, Cambridge, UK, 1971. pp. 50–80.Search in Google Scholar
Hse, C.-Y., Kuo, M. (1988) Influence of extractives on wood gluing and finishing – a review. For. Prod. J.38:52–56.Search in Google Scholar
Kishino, M., Nakano, T. (2002) Adhesion and coating properties of Chinese and Japanese shinanoki (Tilia spp.). Mokuzai Gakkaishi48:371–379.Search in Google Scholar
Makkar, H.P.S. Quantification of Tannins in Tree and Shrub Foliage. Kluwer Academic Publishers, Dordrecht, Germany, 2003.10.1007/978-94-017-0273-7Search in Google Scholar
Nussbaum, R.M., Sterley, M. (2002) The effect of wood extractive content on glue adhesion and surface wettability of wood. Wood Fiber Sci.34:57–71.Search in Google Scholar
Örså, F., Holmbom, B. (1994) A convenient method for the determination of wood extractives in papermaking process waters and effluents. J. Pulp Pap. Sci.20:J361–J365.Search in Google Scholar
Rajakaruna, M.P. (2001) Strength and durability of radiata pine bonded with polyurethane adhesives. In: Proceedings of the International RILEM Symposium on Joints in Timber Structures. Eds. Aicher, S., Reinhardt, H.-W. RILEM Publications. pp. 453–462.Search in Google Scholar
Richter, K., Schirle, M.A. (2002) Behavior of 1 K PUR adhesives under increased moisture and temperature conditions. In: Proceedings of the International Symposium on Wood-based Materials. Eds. Teischinger, A., Stingl, R. COST Action E13, Vienna, Austria. pp. 149–154.Search in Google Scholar
Sitholé, B.B., Sullivan, J.L., Allen, L.H. (1992) Identification and quantitation of acetone extractives of wood and bark by ion exchange and capillary GC with a spreadsheet program. Holzforschung46:409–416.10.1515/hfsg.1992.46.5.409Search in Google Scholar
Sterley, M., Blümer, H., Wålinder, M.E.P. (2004) Edge and face gluing of green timber using a one-component polyurethane adhesive. Holz Roh Werkst.62:479–482.10.1007/s00107-004-0517-7Search in Google Scholar
Tappi Standard T 222 (1988). Om-88, Acid-insoluble lignin in wood and pulp.Search in Google Scholar
Tappi useful method UM250 (1991). Acid-soluable lignin in wood and pulp.Search in Google Scholar
Vick, C.B. (1999) Adhesive bonding of wood materials. In: Wood Handbook – Wood as an Engineering Material. USDA Forest Products Laboratory. Chapter 9.Search in Google Scholar
Vick, C.B., Okkonen, E.A. (1998) Strength and durability of one-part polyurethane adhesive bonds to wood. Forest Prod. J.48:71–76.Search in Google Scholar
©2006 by Walter de Gruyter Berlin New York
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