The effect of donor-acceptor interactions on the mechanical properties of wood

Dawn Ma, William E. Johns, Abdel E. Bayoumi, A. Keith Dunker

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

This paper explores the empirical correlations between the mechanical properties of solvent-treated wood and solvent parameters. Wood beams (10 inch × 0.7 inch × 0.4 inch) of lauan, birch, and Douglas fir were soaked in five solvents (benzene, dioxane, methanol, dimethyl sulfoxide, and distilled water) for 4 months at room temperature (23°C) and then mechanically tested in bending. The acoustic emission (AE) energy (related to failure energy), the modulus of rupture (MOR), and the modulus of elasticity (MOE) of the specimens were determined. It was found that all of these properties of the specimens decreased with the solvent strength parameter which was related to acceptor number (AN), donor number (DN) and molecular volume (MV). The linear correlation of the AE energy of the specimens with the solvent parameter (AN + DN)1/2 was verified. Alternative relationships between the AE energy, MOR or MOE of the specimens and the modified solvent strength parameters, 2.5 DN + AN or DN/MV1/3, were explored. The microstructures of fracture surfaces of lauan specimens were examined by scanning electron microscopy (SEM) and showed dramatic changes when the solvent strength increased, such as microfibril pull-out and a decrease in roughness of the fracture surfaces of cell walls. All these observations reflected the changes in mechanical properties and the mean AE energy qualities of the specimens.

Original languageEnglish (US)
Pages (from-to)411-429
Number of pages19
JournalJournal of Adhesion Science and Technology
Volume4
Issue number1
DOIs
StatePublished - Jan 1 1990
Externally publishedYes

Keywords

  • Lewis acid
  • Lewis base
  • acceptor
  • acoustic emission
  • donor
  • solvent strength parameter
  • wood swelling

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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