Recently, 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: 1989257Bonding 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: 1962121The objective of this research was to develop an adhesive in which part of the synthetic resin is replaced by liquefied wood. A synthetic phenol-formaldehyde (PF) adhesive, mixed with different proportions of liquefied wood, was used for the bonding of two beech wood lamellas. Liquefied wood made from poplar was added in different proportions, ranging from 0 % to 100 %, with increments of 25 %. The lamellas were bonded in a hot press at 180 °C for different press times. It was found that the bond shear strength of the dry specimens increased if 25 % of PF adhesive was replaced by liquefied wood, but decreased if a higher proportion of liquefied wood was used. When testing the specimens after immersion or boiling in water, the bond strength decreased rapidly in the case of the samples which had been bonded with adhesive mixtures containing more than 25 % of liquefied wood.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 1807241Project leader, Prof. Dr. Milan Šernek was appointed based on the publications about liquefied wood and gluing of wood as the member of editorial board and appointed as the editor of the Journal of Adhesion Science and Technology, which is known international scientific journal, indexed by SCI and has the impact factor.
C.04 Editorial board of an international magazine
COBISS.SI-ID: 34942720Project leader, Prof. Dr. Milan Šernek was editor of the international scientific book, which was issued at Brunel University Press. This book, in which the co-editor is also the co-author of one chapter on monitoring of the hardening of adhesives during bonding wood, is the top scientific literature in the field of composing, bonding, properties and use of wood-based panels.
C.01 Editorial board of a foreign/international collection of papers/book
COBISS.SI-ID: 1820041