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Comparison of Dynamic Sorption and Hygroexpansion of Wood by Different Cyclic Hygrothermal Changing Effects

  • Yang, Tiantian (Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University) ;
  • Ma, Erni (Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University)
  • Received : 2015.12.10
  • Accepted : 2016.02.02
  • Published : 2016.03.25

Abstract

To investigate the dynamic sorptive and hygroexpansive behaviors of wood by different cyclic hygrothermal changing effects, poplar (populus euramericana Cv.) specimens, were exposed to dynamic sorption processes where relative humidity (RH) and temperature changed simultaneously in sinusoidal waves at 75-45% and $5-35^{\circ}C$ (condition A) and where RH changed sinusoidally at 75-45% but temperature was controlled at $20^{\circ}C$ (condition B), both for three cyclic periods of 1, 6, and 24 h. Moisture and dimensional changes measured during the cycling gave the following results: Moisture and transverse dimensional changes were generally sinusoidal. Moisture and dimensional amplitude increased with increasing cyclic period but all were lower for thicker specimens. The amplitude ratio of condition A to condition B ranged from 1.0 to 1.6 with the maximum value of 1.57 occurring at the shortest cyclic period, not as much as expected. T/R increased as cyclic period increased or specimen thickness decreased. T/R from condition B was weaker than that from condition A. Sorption and swelling hysteresis existed in both conditions. Sorption hysteresis was negatively related to cyclic period but in positive correlation with specimen thickness. Sorption hysteresis was found more obvious in condition B, while moisture sorption coefficient and humidity expansion coefficient showed the opposite results.

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References

  1. Arevalo, R., Hernandez, R.E. 2001. Influence of moisture sorption on swelling of mahogany (Swietenia macrophylla King) wood. Holzforschung 55: 590-594.
  2. Brunauer, S., Emmett, P.H., Teller, E. 1938. Adsorption of gases in multimolecular layers. Journal of the American Chemical Society 60: 309-319. https://doi.org/10.1021/ja01269a023
  3. Chang, Y., Han, Y., Eom, C., Park, J., Park, M., Choi, I., Yeo, H. 2012. Analysis of factors affecting the hygroscopic performance of thermally treated Pinus koraiensis wood. Journal of The Korean Wood Science & Technology 40(1): 10-18. https://doi.org/10.5658/WOOD.2012.40.1.10
  4. Chen, C., Wangaard, F.F. 1968. Wettability and the hysteresis effect in the sorption of water vapor by wood. Wood Science and Technology 2: 177-187.
  5. Chomcharn, A., Skaar, C. 1983. Dynamic sorption and hygroexpansion of wood wafers exposed to sinusoidally varying humidity, Wood Science and Technology 17(4): 259-277. https://doi.org/10.1007/BF00349914
  6. Dent, R.W. 1997. A multilayer theory for gas sorption I. Sorption of a single gas. Textile Research Journal 40: 145-152.
  7. Engelund, E.T., Thygesen, L.G., Hoffmeyer, P. 2010. Water sorption in wood and modified wood at high values of relative humidity-part 2. Theoretical assessment of the amount of capillary water in wood microvoids. Holzforschung 64: 325-330.
  8. Engelund, E.T., Thygesen, L.G., Svensson, S., Hill, C.A.S. 2013. A critical discussion of the physics of wood-water interactions, Wood Science and Technology 47: 141-161. https://doi.org/10.1007/s00226-012-0514-7
  9. Espenas, L.D. 1971. Shrinkage of Douglas fir, western hemlock, and red alder as affected by drying conditions, Forest Products Journal 21(6): 44-46.
  10. Fan, M.Z., Dinwoodie, J.M., Bonfield, P.W., Breese, M.C. 2004. Dimensional instability of cement bonded particleboard. Part 2: Behavior and its prediction under cyclic changes in RH. Wood Science and Technology 38(1): 53-68. https://doi.org/10.1007/s00226-003-0208-2
  11. Farmer, R.H. 1972. Handbook of hardwoods (2nd edition). Her Majesty Stationary Office, London, England.
  12. Garcia, E.L, Gril, J., De, P.D.P.P., Guindeo, C.A. 2005. Reduction of wood hygroscopicity and associated dimensional response by repeated humidity cycles. Annals of Forest Science 62(3): 275-284. https://doi.org/10.1051/forest:2005020
  13. Gong, R.M., Shen, J., He, L.Z., Liu, Y.L., Xu, L.Y. 2001. The effect of temperature on moisture movement and microstructure of larch wood in man-made forest, Journal of Northeast Forestry University 29(5): 31-33.
  14. Harris, J.M. 1961. The dimensional stability, shrinkage intersection point and related properties of New Zealand timbers. Forest Research Institute, Wellington: N Z. pp. 36.
  15. Hill, C.A.S., Jones, D. 1999. Dimensional changes in Corsican pine sapwood due to chemical modification with linear chain anhydrides. Holzforschung 53: 267-271.
  16. Hill, C.A.S. 2008. The reduction in the fibre saturation point of wood due to chemical modification using anhydride reagents: a reappraisal. Holzforschung 62: 423-428.
  17. Hoffmeyer, P., Engelund, E.T., Thygesen, L.G. 2011. Equilibrium moisture content (EMC) in norway spruceduring the first and second desorptions. Holzforschung 65: 875-882.
  18. Kelsey, K.E. 1957. The sorption of water vapour by wood, Aust. J. Appl. Sci. 8: 42-54.
  19. Kollmann, F.F.P. 1959. $\ddot{U}ber$ die Sorption von Holz und ihre exakte Bestimmung, HolzRoh-Werkst 17(5): 165-171. https://doi.org/10.1007/BF02608808
  20. Liu, Y. X., Zhao, G. J. 2004. Wood Resources in Materials Science. China Forestry Publishing House, Beijing, China.
  21. Ma, E.N., Nakao, T., Zhao, G.J., Ohata, H., Kawamura, S. 2010. Dynamic sorption and hygroexpansion of wood subjected to cyclic relative humidity changes, Wood Fiber Science 42(2): 229-236.
  22. Ma, E.N., Zhao, G.J. 2012. Special topics on wood physics. China Forestry Publishing House, Beijing, China.
  23. Macromolecule Academy.1958. Physical Properties of Macromolecules. Kyoritsu Press, Tokyo, Japan.
  24. Noack, D., Schwab, E., Bartz, A. 1973. Characteristics for a judgement of the sorption and swelling behavior of wood. Wood Science and Technology 7: 218-236. https://doi.org/10.1007/BF00355552
  25. Obataya, E., Tomita, B. 2002. Hygroscopicity of heat-treated wood II: Reversible and irreversible reductions in the hygroscopicity of wood due to heating. Journal of Wood Science 48(4): 288-295.
  26. Olek, W., Majka, J., Czajkowski, L. 2013. Sorption isotherms of thermally modified wood. Holzforschung 67: 183-191.
  27. Park,Y., Han, Y., Park, J., Chang Y., Yang, S., Chung, H., Kim, K., Yeo, H. 2015. Evaluation of physico-mechanical properties and durability of Larix kaempferi wood heat-treated by hot air. Journal of The Korean Wood Science & Technology 43(3): 334-343. https://doi.org/10.5658/WOOD.2015.43.3.334
  28. Schniewind, A.P. 1967. Creep-rupture life of Douglas-fir under cyclic environmental conditions, Wood Science and Technology 1(4): 278-288. https://doi.org/10.1007/BF00349759
  29. Seung, W.O., Hee, J.P. 2015. Vacuum pressure treatment of water-soluble melamine resin impregnation for improvement of dimensional stability on softwoods. Journal of The Korean Wood Science & Technology 43(3): 327-333. https://doi.org/10.5658/WOOD.2015.43.3.327
  30. Simpson, W.T. 1973. Predicting equilibrium moisture content of wood by mathematical models. Wood and Fiber 5(1): 41-49.
  31. Skaar, C. 1988. Wood-water Relations. Springer-Verlag, Berlin, Germany.
  32. Stamm, A.J. 1964. Wood and Cellulose Science. Ronald Press, New York, USA.
  33. Stamm, A.J., Loughborough, W.K. 1935. Thermodynamics of the swelling of wood, Journal of Physical Chemistry 39(1): 121-132. https://doi.org/10.1021/j150361a009
  34. Stevens, W.C. 1963. The transverse shrinkage of wood, Forest Products Journal 13(9): 386-389.
  35. Thygesen, L.G., Engelund, E.T., Hoffmeyer, P. 2010. Water sorption in wood and modified wood at high values of relative humidity-Part 1: results for untreated, acetylated, and furfurylated Norwayspruce. Holzforschung 64: 315-323.
  36. Urquhart, A.R. 1929. The mechanism of the adsorption of water by cotton. Journal of the Textile Institute 20: 125-132. https://doi.org/10.1080/19447022908661485
  37. Weichert, L. 1963. Investigations on sorption and swelling of spruce, beech and compressed beech wood at temperatures between $20^{\circ}C$ and $100^{\circ}C$, Holz. Roh-Werkst 21(8): 290-300. https://doi.org/10.1007/BF02610962
  38. Willems, W. 2014a. The water vapor sorption mechanism and its hysteresis in wood: the water/void mixture postulate. Journal of the Wood Science and Technology 48: 499-518. https://doi.org/10.1007/s00226-014-0617-4
  39. Willems, W. 2014b. The hydrostatic pressure and temperature dependence of wood moisture sorption isotherms. Journal of the Wood Science and Technology 48: 483-498. https://doi.org/10.1007/s00226-014-0616-5
  40. Willems, W. 2015. A critical review of the multilayer sorption models and comparison with the sorption site occupancy (SSO) model for wood moisture sorption isotherm analysis. Holzforschung 69(1): 67-75.
  41. Wu, Q.L., Lee, J.N. 2002. Thickness swelling of oriented strandboard under long-term cyclic humidity exposure condition. Wood Fiber Science 34(1): 125-139.
  42. Yang, T.T., Ma, E.N. 2013. Dynamic sorption and hygroexpansion of wood by humidity cyclically changing effect, Journal of Functional Materials 23(44): 3055-3059.
  43. Yang, T.T., Ma, E.N. 2015. Dynamic sorption and hygroexpansion of wood subjected to cyclic relative humidity changes II Effect of temperature. Bioresources 10(1): 1675-1685.