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 conferenceCOBISS.SI-ID: 1989257
In this research we liquefied cellulignin – the residue from tanninextraction and furfural production from chestnut wood (Castanea Sativa Mill.). We optimized the liquefied process of the cellulignin in glycerol (G) with sulfuric acid at 180 °C under atmospheric pressure. At first, we evaluated the effect of different reaction times on the liquefaction yield at a constant reaction temperature and constant solvent to cellulignin ratio. HP DSC analysis was then performed to investigate possible selfcrosslinking ability of the liquefaction product. We detected two exothermal peaks (in the range from 160 °C to 250 °C and in the range from 350 °C to 400 °C, respectively). The first exothermal peak wasattributed to the crosslinking chemical reaction of the reaction products and the second one was credited to recrosslinking of the crosslinking products. It was concluded that liquefied cellulignin could be used as a feedstock in the production of adhesives and of wood coatings.
B.03 Paper at an international scientific conferenceCOBISS.SI-ID: 1938569
Research activities and publications of the researchers of the project group and of the porject leader in 2011, that investigated possibilities of innovative utilisation of wood liquefied wood, resulted in invitation to the researcher dr. Marko Petrič, to become a member of the editorial board of the established scientific journal, Journal of Adhesion Science and Technology (SCI IF in 2010: 0,98; II engineering, chemical ; 65/134 ; quartil: 2; ). Despite the fact that M.Petrič became the editorial board member on the 1st January 2012, the achievement should be regarded as the achievement of work of all members of the research group in the year 2011.
C.06 Editorial board membershipCOBISS.SI-ID: 34942720
On the basis of the project programme and its results, in 2011 we made a successful application at the Slovene Human Resources Development and Scholarship Fund (SHRDSF) for cofinancing of the one year guest researcher stay of Dr Arnaud Maxime Cheumani Yona (from France, the citizenship of Cameroun). The contract (No. 110136/2011) was signed by the SHRDSF and Iltra, d.o.o. which is a collaborating research organisation at this project. His research work was predominantly performed in the laboratories of Biotechnical Faculty. Cofinancing of the research of Dr Cheumani is considered as an achievement, since the competition for the funds of SHRDSF is high and we succeeded on the basis of the results of this project that were the starting point for Dr Cheumani's research programme in Slovenia. His research was complementary to the research programme of this project.
Possibilities of wood liquefaction to manage post-consumed CCB (copper, chromium, boron) containing wood were considered, with a focus on investigations of fungicidal properties of liquefied wood with and without CCB. It was found out that liquefied CCB containing poplar and spruce wood did not exhibit sufficient protective efficacy against the selected wood rotting fungi. It is also believed that turning of liquefied wood with CCB into another products, such as adhesives, coatings or plastics, to extend service life of wood that had been protected by CCB, is most likely not an attractive solution. However, liquefaction could be interesting as the first step in detoxification of spent CCB (copper, chromium, boron) treated wood.
B.03 Paper at an international scientific conferenceCOBISS.SI-ID: 2015881