Bonding performance of glued laminated timber, which was produced from the heat treated wood and bonded with the adhesive mixture containing different proportions of liquefied wood, was studied. The results of the shear strength of the adhesive bond indicated that the heat treated wood bonded with the adhesive mixture containing liquefied wood can be used as elements for windows. Standard requirements have been fulfilled with the specimens, which were bonded with the adhesive mixture containing 25 % of liquefied wood and 75 % of melamine-urea-formaldehyde adhesive. Novel laminated composites from heat treated wood, bonded with new type of adhesives, represent ecologically friendly products because a part of adhesive was made from natural renewable material – wood.
F.06 Development of a new product
COBISS.SI-ID: 1962121Recently, the liquefaction of wood has been considered as a possible bio alternative for raw materials for polymer syntheses. The objective of this study has been to examine the feasibility of using liquefied wood as an adhesive for bonding wood with high-frequency technology. In the experiment, solid beech wood lamellas as a substrate and liquefied wood from poplar as an adhesive were used. The shear strength and the short-term durability of the adhesive bond were determined. It was found that relatively high immediate shear strength could be achieved in the case of the high-frequency bonding of wood with adhesive made from liquefied wood, but this property decreased rapidly over time. Immersion of the specimens in water resulted in a dramatic reduction in the bond shear strength. The inclusion of synthetic resin in the adhesive made from liquefied wood improved the bond shear strength and durability. The results of this study have shown the potentials for using liquefied wood for novel adhesives made from renewable resources.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 1989257In the thesis the effect of the temperature used for the thermal modification of wood on the curing of adhesive and on bond performance was investigated. Spruce wood, heat treated at temperatures of 150, 170, 190, 210 and 230 °C was used. The curing of the adhesives was monitored by measuring their rheological properties with a rheometer. It was found that the adhesives cured more slowly depending on the degree of thermal modification. Thermal modification reduced surface wetting with water. In the case of all the adhesives bonds it was noticeable that with a higher degree of thermal modification the deformation was smaller when failure of the bond occurred, and that the failure was more brittle.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 753015