Effect of hygrothermal treatment on wood properties: color changes and kinetic analysis using four softwood and seven hardwood species

Published Date
November 2016, Volume 50, Issue 6, pp 1145–1160

Original

First Online: 

13 May 2016

DOI: 10.1007/s00226-016-0833-1

Cite this article as: 

Matsuo, M.U., Mitsui, K., Kobayashi, I. et al. Wood Sci Technol (2016) 50: 1145. doi:10.1007/s00226-016-0833-1

Abstract

Color changes of four softwood and seven hardwood species during hygrothermal treatment were compared among species and kinetically evaluated. Treatment temperature ranged from 70 to 120 °C, and the durations were 5–150 h. Generally, the L∗$L^{}$ (lightness) decreased and the total color differences (ΔE∗ab)$\mathrm{\Delta }{E}_{\text{ab}}^{}$ increased irrespective of the treatment temperature. a∗$a^{}$ and b∗$b^{}$ (redness and yellowness) values varied spuriously based on the wood species. Kinetic analysis using the time–temperature superposition principle, which uses the whole data set, was successfully applied to the color changes. The apparent activation energies of the color changes calculated from ΔE∗ab$\mathrm{\Delta }{E}_{\text{ab}}^{}$ were 24.3–40.8 kJ/mol for softwood and 32.3–61.3 kJ/mol for hardwood. The average apparent activation energy for hardwood was higher than for softwood. These values were lower than those calculated from other material properties. The obtained results will contribute to assess the color changes during the early stage of kiln drying and hygrothermal modification of wood.

References 

1. Bekhta P, Niemz P (2003) Effect of high temperature on the change in color, dimensional stability and mechanical properties of spruce wood. Holzforschung 57:539–546CrossRefGoogle Scholar
2. Brischke C, Welzbacher CR, Brandt K, Rapp AO (2007) Quality control of thermally modified timber: interrelationship between heat treatment intensities and CIE L*a*b* color data on homogenized wood samples. Holzforschung 61:19–22CrossRefGoogle Scholar
3. Ding HZ, Wang ZD (2007) Time–temperature superposition method for predicting the permanence of paper by extrapolating accelerated ageing data to ambient conditions. Cellulose 14:171–181CrossRefGoogle Scholar
4. Esteves B, Pereira H (2009) Wood modification by heat treatment: a review. Bioresources 4:370–404Google Scholar
5. Esteves B, Marques AV, Domingos I, Pereira H (2008) Heat-induced colour changes of pine (Pinus pinaster) and eucalypt (Eucalyptus globulus) wood. Wood Sci Technol 42:369–384CrossRefGoogle Scholar
6. Gillen KT, Celina M (2001) The wear-out approach for predicting the remaining lifetime of materials. Polym Degrad Stab 71:15–30CrossRefGoogle Scholar
7. Gillen KT, Clough RL (1989) Time–temperature-dose rate superposition: a methodology for extrapolating accelerated radiation aging data to low dose rate conditions. Polym Degrad Stab 24:137–168CrossRefGoogle Scholar
8. Goli G, Marcon B, Fioravanti M (2014) Poplar wood heat treatment: effect of air ventilation rate and initial moisture content on reaction kinetics, physical and mechanical properties. Wood Sci Technol 48:1303–1316CrossRefGoogle Scholar
9. González-Peña MM, Hale MDC (2009a) Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 1: colour evolution and colour changes. Holzforschung 63:385–393Google Scholar
10. González-Peña MM, Hale MDC (2009b) Colour in thermally modified wood of beech, Norway spruce and Scots pine. Part 2: property predictions from colour changes. Holzforschung 63:394–401Google Scholar
11. González-Peña MM, Hale MD (2011) Rapid assessment of physical properties and chemical composition of thermally modified wood by mid-infrared spectroscopy. Wood Sci Technol 45:83–102CrossRefGoogle Scholar
12. Hon DNS, Mineura N (2001) Color and discoloration. In: Hon DNS, Shiraishi N (eds) Wood and cellulosic chemistry. Marcel Dekker, New York, pp 385–442Google Scholar
13. JIS Z 8730 (2009) Colour specification-colour differences of object colours
14. JIS Z 8781-4 (2013) Colorimetry-Part 4: CIE 1976 L*a*b* Colour space
15. Johansson D, Morén T (2006) The potential of colour measurement for strength prediction of thermally treated wood. Holz Roh Werkst 64:104–110CrossRefGoogle Scholar
16. Kohara J (1958a) Study on the old timber. Res Rep Fac Technol Chiba Univ 9(15):1–55 [in Japanese]Google Scholar
17. Kohara J (1958b) Study on the old timber. Res Rep Fac Technol Chiba Univ 9(16):23–65 [in Japanese]Google Scholar
18. Kübler H (1987) Growth stresses in trees and related wood properties. For Prod Abstr 10(3):61–119Google Scholar
19. Matsuo M, Yokoyama M, Umemura K, Gril J, Yano K, Kawai S (2010) Color changes in wood during heating: kinetic analysis by applying a time–temperature superposition method. Appl Phys A Mater 99:47–52CrossRefGoogle Scholar
20. Matsuo M, Yokoyama M, Umemura K, Sugiyama J, Kawai S, Gril J, Kubodera S, Mitsutani T, Ozaki H, Sakamoto M, Imamura M (2011) Aging of wood: analysis of color changes during natural aging and heat treatment. Holzforschung 65:361–368CrossRefGoogle Scholar
21. Matsuo M, Umemura K, Kawai S (2012) Kinetic analysis of color changes in cellulose during heat treatment. J Wood Sci 58:113–119CrossRefGoogle Scholar
22. Matsuo M, Umemura K, Kawai S (2014) Kinetic analysis of color changes in keyaki (Zelkovaserrata) and sugi (Cryptomeria japonica) wood during heat treatment. J Wood Sci 60:12–20CrossRefGoogle Scholar
23. Menezzi CHS, Tomaselli I, Okino EYA, Teixeira DE, Santana MAE (2009) Thermal modification of consolidated oriented strandboards: effects on dimensional stability, mechanical properties, chemical composition and surface color. Eur J Wood Wood Prod 67:383–396Google Scholar
24. Möttönen V, Kärki T (2008) Color changes of birch wood during high-temperature drying. Dry Technol 26:1125–1128CrossRefGoogle Scholar
25. Navi P, Sandberg D (2012) Heat treatment. Thermo-hydro-mechanical processing of wood. EPFL Press, Lausanne, pp 249–286Google Scholar
26. Okuyama T, Yamamoto H, Murase Y (1988) Quality improvement in small log of sugi by direct heating method. Wood Ind 43:359–363 [in Japanese with English summary]Google Scholar
27. Okuyama T, Yamamoto H, Kobayshi I (1990) Quality improvement in small log of sugi by direct heating method (2). Wood Ind 45:63–67 [in Japanese with English summary]Google Scholar
28. Stamm AJ (1956) Thermal degradation of wood and cellulose. Ind Eng Chem 48:413–417CrossRefGoogle Scholar
29. Sundqvist B (2002) Color response of Scots pine (Pinus sylvestris), Norway spruce (Piceaabies) and birch (Betula pubescens) subjected to heat treatment in capillary phase. Eur J Wood Wood Prod 60:106–114CrossRefGoogle Scholar
30. Wise J, Gillen KT, Clough RL (1995) An ultrasensitive technique for testing the Arrhenius extrapolation assumption for thermally aged elastomers. Polym Degrad Stab 49:403–418CrossRefGoogle Scholar
31. Xu C, Xing C, Pan H, Kamdem PD, Matuana LM, Jian W, Wang G (2016) Time–temperature superposition principle application to the hygrothermal discoloration of colored high-density polypropylene/wood composites. Polym Compos 37(4):1016–1020CrossRefGoogle Scholar
32. Zou X, Uesaka T, Gurnagul N (1996) Prediction of paper permanence by accelerated aging II. Comparison of the predictions with natural aging results. Cellulose 3:243–267CrossRefGoogle Scholar

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