Strength Tests on Acetylated Aspen Flakeboards Exposed to a Brown-Rot Fungus

Authors

  • Roger M. Rowell
  • John A. Youngquist
  • Yuji Imamura

Keywords:

Chemical modification, acetylation, flakeboard, aspen, strength, fungi, mechanical properties

Abstract

Aspen flakeboards made from control flakes and acetylated flakes at 18% acetyl weight gain using phenol-formaldehyde or isocyanate adhesives were subjected to a bending creep test under progressive brown-rot fungal attack with Tyromyces palustris. Deflection of the boards was measured as a function of time until failure. Isocyanate-bonded control flakeboards failed in an average of 26 days, while isocyanate-bonded acetylated boards showed little deflection after 100 days in test. Average weight loss of isocyanate-bonded control boards at failure averaged 6.2%, while the acetylated boards showed about 1.0% weight loss at the end of 100 days. Phenol-formaldehyde-bonded control flakeboards failed in an average of 76 days, while acetylated boards showed little deflection after 100 days in test. Average weight loss of phenol-formaldehyde-bonded control boards at failure averaged 8.6%, while the acetylated boards showed no weight loss after 100 days.

References

Cowling, E. B. 1961. Comparative biochemistry of the decay of sweetgum sapwood by white-rot and brown-rot fungi. USDA Forest Serv. Tech. Bull. No. 1258, p. 50.nImamura, Y., and K. Nishimoto. 1985. Bending creep test of wood-based materials under fungal attack. J. Soc. Materials Sci. 34(383):985-989, Japan.nRowell, R. M., G. R. Esenther, D. D. Nicholas, and T. Nilsson. 1987. Biological resistance of southern pine and aspen flakeboards made from acetylated flakes. J. Wood Chem. Technol. 7(3):427-440.nRowell, R. M., A.-M. Tillman, and R. Simonson. 1986. A simplified procedure for the acetylation of hardwood and softwood flakes for flakeboard production. J. Wood Chem. Technol. 6(3):427-448.nYoungquist, J. A., A. Krzyskik, and R. M. Rowell. 1986. Mechanical properties and dimensional stability of acetylated aspen flakeboard. Holz Roh Werkst. 44(12):453-457.n

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Published

2007-06-22

Issue

Number 2 / April 1988

Section

Research Contributions

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