ProLigno / ProLigno 2009 Issue 2  






Dr. Chem., Researcher - Latvian State Institute of Wood Chemistry
Address: 27 Dzerbenes Str., LV-1006 Riga, Latvia

Dr. Chem., Senior Researcher - Latvian State Institure of Wood Chemistry
Address: 27 Dzerbenes Str., LV-1006 Riga, Latvia

Dr. Chem., Researcher - Latvian State Institute of Wood Chemistry
Address: 27 Dzerbenes Str., LV-1006 Riga, Latvia

Dr. Chem., Researcher - Latvian State Institute of Wood Chemistry
Address: 27 Dzerbenes Str., LV-1006 Riga, Latvia

Abstract: To replace traditional wood preservatives, containing heavy metals, different methods for modification of wood (thermal and chemical, use of organic preservatives etc.) are proposed for enhancing the biological resistance of wood. Great energy consumption, high cost of modifiers and their unfavourable impact on the environment are assigned to drawbacks of these methods. In the present work, to enhance the durability of wood, it is proposed to introduce into wood channels (canals, lumens and intercellular spaces) lignin - a substance that is both wood- and environment-friendly. Pine wood samples were impregnated with alkali lignin aqueous solutions under vacuum. Despite the high hydrophility of modified wood, its exposure on cultures of brown and white rots during 6 weeks has shown the high efficiency of lignin for enhancing the durability of wood with regard to both rots. Sorption of water study and density measure demonstrate that, upon modification, the interstructural bonds become weaker, the volume of narrow (micro- and meso-) pores increases almost twice, and the volume of broad pores (macropores) of wood decreases by third. It is concluded that lignin fills partially (by 13%) the channels, blocking the entries to them and hampering the diffusion of fungal enzymes to the cell wall surface.

Key words: wood, biodegradation, lignin, water sorption, density, modification.

CHIRKOVA, J.; ANDERSONS, B.; ANDERSONE, I: (2004). Determination of standard isotherm of some vapours sorption by cellulose. J. Colloid Interface Sci., 2004, 276, 284-289. ISSN 0021-9797.
CHIRKOVA, J.; ANDERSONS, B.; ANDERSONE, I. (2007). Peculiarities of the sorption studies of biopolymers. In Proceedings of Italic 4: Science and Technology of Biomass: Advances and Challenges, Rome, Italy: May 8-10, 2007, 165-168.
DONATH, S.; MILITZ, H.; MAI, C. (2006). Creating water-repellent effects on wood by treatment with silanes. Holzforschung, 2006, 60, 40-46. ISSN 0018-3830.
ESTEVES, B.M.; DOMINGOS, I.J.; PETEIRA, H.M. (2008). Pine wood modification by heat treatment in air. Bioresources, 2008, 3, 1, 142-154. ISSN 1930-2126.
FLOURNOY, D.S.; KIRK, T.K.; HIGHLEY, T.L. (1991). Changes in pore structure and cell wall volume. Holzforschung, 1991, 45, 383-388. ISSN 0018-3830.
GREGG, S.J.; SING, K.S.W. (1982). Adsorption, Surface Area and Porosity. London - New-York, Academic Press, 1982, 310 p.
GOODELL, B.; NICHOLAS, D.D.; SCHULTZ, T.P. (2003). Introduction to wood deterioration and preservation. In Wood Deterioration and Preservation. Eds. Goodell, B., Nicholas, D.D., Schultz, T.P. Amer. Chem. Soc. (ACS), Washington, DC, 2003, 2-9. ISBN 0-8412-3797-2.
HILL, C.A.S.; FORTER, S.C.; FARAHANI, M.R.M.; HALE, M.D.C.; ORMONDROYD, G.R.; WILLIAMS, G.R. (2005). An investigation of cell wall micropore blocking as a possible mechanism for the decay resistance of anhydride modified wood. International Biodeterioration and Biodegradation, 2005, 55, 69-76. ISSN 0964-8305.
HILL, C.A.S.; JONES, D.; STRICKLAND, D.; CETIN, A.S. (1998). Kinetic and mechanistic aspects of the acetylation of wood with acetic anhydride. Holzforschung, 1998, 52, 1-7. ISSN 0018-3830.
HYVONEN, A.; PILTONEN, P.; NIINIMAKI. (2006). Tall oil/water - emulsions as water repellents for Scots pine sapwood. Holz als Row- and Werkstoff, 2006, 64, 68-73. ISSN 0018-3768.
KARNAUKHOV, A. P. (1999). Adsorption. Texture of disperse and popous materials. Novosibirsk, Nauka, 1999, 470 p. (in Russian).
MAI, C.; MILITZ, H. (2004). Modification of wood with silicon compounds. Treatment system based on organic silicon compounds - a review. Wood Sci. and Technol., 2004, 37, 453-461. ISSN 0043-7719.
METSA-KORTELAINEN, S.; ANTIKAINEN, T.; VIITANIEMI, P. (2006). The water absorption of sapwood and heartwood of Scots pine and Norway spruce heat-treated at 170 C, 190 C, 210 C and 230 C. Holz als Row- and Werkstoff, 2006, 64, 192-197. ISSN 0018-3768.
TJEERDSMA, B.F.; MILITZ, H. (2005). Chemical changes in hydrothermal treated wood: FTIR analysis of combined hydrothermal and dry heat-treated wood. Holz als Roh- and Werkstoff, 2005, 63, 102-111. ISSN 0018-3768.
SCHNEIDER, M.H.; BREBNER, K.L. (1985). Wood-polymer combinations: the chemical modification of wood by alkoxysilane coupling agents. Wood Sci. and Technol., 1985, 19, 67-73. ISSN 0043-7719.




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