Abstract
Effects of impregnation with a silver nano-suspension, as well as of heat-treatment, on pull-off adhesion strengths of the coating system on three commercial solid wood species were studied. The wood species included beech, poplar, and fi r. The size range of silver nanoparticles was 30 – 80 nm. The specimens were coated with an un-pigmented sealer and a clear fi nish on the basis of an organic solvent. The results showed that the highest and the lowest pull-off strengths were found in beech specimens heat-treated at 145 °C (5.7 MPa) and in nanosilver-impregnated poplar specimens heat-treated at 185 °C (2.5 MPa), respectively. Impregnation with nanosilver decreased pull-off strength in the case of all species as a result of formation of micro checks in the cell walls caused by the impregnation under high pressure in vessel. Heat-treatment at the temperature lower than 145 °C increased pull-off strength as to the irreversible hydrogen bonding in the course of water movements within the pore system of the cell walls, resulting in extra bonds among cell wall components and higher mechanical properties. However, heat-treatment at the temperature higher than 185 °C signifi cantly decreased the strength as the degradation of hemicellulose and cell wall wood components caused signifi cant decrease in mechanical strength and cell wall thinning. High thermal conductivity coeffi cient of silver intensifi ed the impact of heat-treatment by rapid absorption of heat on the surface of the specimens.
Highlights
IntroductionThe porous structure in different wood species is one of the root causes of difference in physical and mechanical properties of the wood produced by each species
Heat-treatment at the temperature higher than 185 °C significantly decreased the strength as the degradation of hemicellulose and cell wall wood components caused significant decrease in mechanical strength and cell wall thinning
The porous structure in different wood species is one of the root causes of difference in physical and mechanical properties of the wood produced by each species
Summary
The porous structure in different wood species is one of the root causes of difference in physical and mechanical properties of the wood produced by each species. The size of the pores, the way they are inter-connected or isolated from the neighboring pores, and even the quality of the surface of the pores would all influence the properties. Many factors influence the formation of wood and thereof its structure and porous system; factors such as initial spacing, intercropping with different plants, drying procedures (Oltean et al, 2007), growing season, extractive content, and moisture content and hygroscopicity of wood (Borrega and Karenlampi, 2010; Hering et al, 2012). Wood is frequently modified by engineering processes to get stiffness or homogeneous mechanical properties because only few species exhibit radial and axial uniformity.
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