Monitoring electrical properties of thermally modified wood as a possible tool for quality assessment
Source abstract
Abstract
Abstract The electrical properties of thermally modified wood (TMW) of southern pine (Pinusspp.) have been investigated, while the samples were modified at 150°C, 175°C, 200°C, and 225°C for 4 h. After conditioning the samples at five relative humidities, the constants for electrical resistance (kR) and dielectricity (kP) were measured and calculated according to the model “electrical properties vs. moisture content”. The correlations betweenkRandkPand mass loss (ML),CIEL*a*b* color and bending properties in terms of modulus of rupture and modulus of elasticity were established. The coefficients of determination (R2) between these parameters were found to be between 0.926 and 0.999. TM influenced bothkRandkPvia changing the concentration and mobility of ions inside the wood and decreasing amount of polar groups of wood polymers. The conclusion is that the severity of TM such as the mechanical properties of TMW is in a close relation to the electrical properties.
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Research context
OpenAlex topics: Wood Treatment and Properties · Tree Root and Stability Studies · Bamboo properties and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Qinghua East Road 35, Haidian, Beijing, 100083, China
School of Packaging, Michigan State University, East Lansing, MI, 48824, USA
References (32)
Show source-provided references
1. Bächle, H., Zimmer, B., Wegener, G. (2012) Classification of thermally modified wood by FT-NIR spectroscopy and SIMCA. Wood Sci. Techn. 46:1181–1192.10.1007/s00226-012-0481-z ↗
2. Bakar, B.F.A., Hiziroglu, S., Md Tahir, P. (2013) Properties of some thermally modified wood species. Mat. Design 43:348–355.10.1016/j.matdes.2012.06.054 ↗
3. Brischke, C., Welzbacher, C.R., Brandt, K., Rapp, A. O. (2007) Quality control of thermally modified timber: interrelationship between heat treatment intensities and CIE L* a* b* color data on homogenized wood samples. Holzforschung 61:19–22.10.1515/HF.2007.00410.1515/HF.2007.004 ↗
4. Brischke, C., Sachse, K.A., Welzbacher, C.R. (2014) Modeling the influence of thermal modification on the electrical conductivity of wood. Holzforschung 68:185–193.10.1515/hf-2013-004110.1515/hf-2013-0041 ↗
5. Brown, J., Davidson, R.W., Skaar, C. (1963) Mechanism of electrical conduction in wood. For. Prod. J. 13:455–459.
6. Cademartori, P.H.G., dos Santos, P.S., Serrano, L., Labidi, J., Gatto, D.A. (2013) Effect of thermal treatment on physicochemical properties of Gympie messmate wood. Ind. Crops Prod. 45:360–366.10.1016/j.indcrop.2012.12.04810.1016/j.indcrop.2012.12.048 ↗
7. Cui, W., Kamdem, D.P., Rypstra, T. (2004) Diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) and color changes of artificial weathered wood. Wood Fiber Sci. 36:291–301.
8. Finnish Thermowood Association. Thermowood Handbook. Finnish Thermowood Association, 2003.
9. Franceschi, V.R., Nakata, P.A. (2005) Calcium oxalate in plants: formation and function. Annu. Rev. Plant Biol. 56:41–71.10.1146/annurev.arplant.56.032604.1441061586208910.1146/annurev.arplant.56.032604.144106 ↗
10. González-Peña, M.M., Hale, M.D. (2009) Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 1: colour evolution and colour changes. Holzforschung. 63:385–393.10.1515/HF.2009.07810.1515/HF.2009.078 ↗
11. González-Peña, M.M., Hale, M.D. (2011) Rapid assessment of physical properties and chemical composition of thermally modified wood by mid-infrared spectroscopy. Wood Sci. Techn. 45:83–102.10.1007/s00226-010-0307-9 ↗
12. Gündüz, G., Niemz, P., Aydemir, D. (2008) Changes in specific gravity and equilibrium moisture content in heat-treated fir (Abies nordmanniana ssp. bornmülleriana Mattf.) wood. Drying Techn. 26:1135–1139.10.1080/0737393080226620710.1080/07373930802266207 ↗
13. Gunduz, G., Aydemir, D., Karakas, G. (2009) The effects of thermal treatment on the mechanical properties of wild Pear (Pyrus elaeagnifolia Pall.) wood and changes in physical properties. Mat. Design. 30:4391–4395.10.1016/j.matdes.2009.04.005 ↗
14. Johansson, D., Morén, T. (2006) The potential of colour measurement for strength prediction of thermally treated wood. Holz Roh-Werkst. 64:104–110.10.1007/s00107-005-0082-810.1007/s00107-005-0082-8 ↗
15. Kačíková, D., Kačík, F., Čabalová, I., Ďurkovič, J. (2013) Effects of thermal treatment on chemical, mechanical and colour traits in Norway spruce wood. Biores. Techn. 144:669–674.10.1016/j.biortech.2013.06.110 ↗
16. Korošec, R.C., Lavrič, B., Rep, G., Pohleven, F., Bukovec, P. (2009) Thermogravimetry as a possible tool for determining modification degree of thermally treated Norway spruce wood. J. Thermal Anal. Calor. 98:189–195.10.1007/s10973-009-0374-z ↗
17. Langwig, J.E., Skaar, C. (1975) Electrical resistivities of 18 Venezuelan and 13 North American woods. Wood Sci. 8:350–354.
18. Maeda, H., Fukada, E. (1987) Effect of bound water on piezoelectric, dielectric, and elastic properties of wood. J. Appl. Pol. Sci. 33:1187–1198.10.1002/app.1987.070330411 ↗
19. Metsä-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 Roh-Werkst. 64:192–197.10.1007/s00107-005-0063-y10.1007/s00107-005-0063-y ↗
20. Militz, H. (2002) Thermal treatment of wood: European processes and their background. IRG/WP, 02-40241. In: Proceedings, International Research Group on Wood Protection, 12–17 May, Cardiff.
21. Norimoto, M. (1976) Dielectric properties of wood. Wood Res. 5:106–152.
22. Priadi, T., Hiziroglu, S. (2013) Characterization of heat treated wood species. Mat. Design. 49:575–582.10.1016/j.matdes.2012.12.067 ↗
23. Skaar, C. Wood-Water Relations. Springer-Verlag, Berlin, 1988.10.1007/978-3-642-73683-410.1007/978-3-642-73683-4 ↗
24. Stamm, A.J. (1927) The electrical resistance of wood as a measure of its moisture content. Ind. Eng. Chem. 19:1021–1025.10.1021/ie50213a022 ↗
25. Šušteršic, Ž., Mohareb, A., Chaouch, M., Pétrissans, M., Petrič, M., Gérardin, P. (2010) Prediction of the decay resistance of heat treated wood on the basis of its elemental composition. Polymer Degr. Stab. 95:94–97.10.1016/j.polymdegradstab.2009.10.01310.1016/j.polymdegradstab.2009.10.013 ↗
26. Todorovic, N.V., Popović, Z., Milić, G., Popadić, R. (2012) Estimation of heat-treated beechwood properties by color change. BioResources. 7:799–815.10.15376/biores.7.1.799-815 ↗
27. Torgovnikov, G.I. Dielectric Properties of Wood and Wood-Based Materials. Springer-Verlag, Berlin, 1993.10.1007/978-3-642-77453-910.1007/978-3-642-77453-9 ↗
28. Uyemura, T. (1960) Dielectrical properties of woods as the indicator of moisture. Gov. For. Exp. Stn. Tokio. Bull. 119:95–172.
29. Vermaas, H.F. (1984) The influence of sample density on the DC resistance of wood. Holzforschung 38:109–112.10.1515/hfsg.1984.38.2.10910.1515/hfsg.1984.38.2.109 ↗
30. Wang, W., Cao, J., Cui, F., Wang, X. (2012) Effect of pH on chemical components and mechanical properties of thermally modified wood. Wood Fiber Sci. 44:46–53.
31. Welzbacher, C.R., Brischke, C., Rapp, A.O. (2007) Influence of treatment temperature and duration on selected biological, mechanical, physical and optical properties of thermally modified timber. Wood Mat. Sci. Eng. 2:66–76.10.1080/17480270701770606 ↗
32. Willems, W., Gérardin, P., Militz, H. (2013) The average carbon oxidation state of thermally modified wood as a marker for its decay resistance against Basidiomycetes. Polym. Degr. Stab. 98:2140–2145.10.1016/j.polymdegradstab.2013.09.00310.1016/j.polymdegradstab.2013.09.003 ↗