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

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

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

This paper explores the empirical correlations between the mechanical properties of solvent-treated wood and solvent parameters. Wood beams (10 inch x 0.7 inch x 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 NIOE 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

Fingerprint

Wood
mechanical properties
Mechanical properties
acoustic emission
Acoustic emissions
interactions
energy
Dimethyl sulfoxide
Dimethyl Sulfoxide
Benzene
Methanol
modulus of elasticity
roughness
methyl alcohol
Elastic moduli
Surface roughness
benzene
Cells
microstructure
Microstructure

Keywords

  • Acceptor
  • Acoustic emission
  • Donor
  • Lewis acid
  • Lewis base
  • Solvent strength parameter
  • Wood swelling

ASJC Scopus subject areas

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

Cite this

The effect of donor-acceptor interactions on the mechanical properties of wood. / Ma, Dawn; Johns, William E.; Dunker, A. Keith; Dunker, A.

In: Journal of Adhesion Science and Technology, Vol. 4, No. 1, 01.01.1990, p. 411-429.

Research output: Contribution to journalArticle

Ma, Dawn ; Johns, William E. ; Dunker, A. Keith ; Dunker, A. / The effect of donor-acceptor interactions on the mechanical properties of wood. In: Journal of Adhesion Science and Technology. 1990 ; Vol. 4, No. 1. pp. 411-429.
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