Effect of densification on the practical properties of chemical and thermal modified poplar wood

Document Type : Research Paper

Authors

1 Tarbiat Modares university

2 university of tehran

Abstract

For investigation on the effect of densification on the physical and mechanical properties of the chemically and thermally modified poplar wood (Populus deltoides), thermal modification at 170°C, chemical modification with glutaraldehyde, and compression at three levels of 10, 25, and 40% at the hot pressing time of 2h were carried out. With increasing compression ratio from 25 to 40%, the density of thermally and chemically modified samples increased by 13% and 8%, respectively. Spring back and moisture absorption of the thermally modified/compressed samples was more than chemically modified/compressed ones. Water absorption and thickness swelling for 10% compression ratio were more than the chemical and thermal control samples but significantly decreased with increasing compression ratio. The mechanical properties of both thermally and chemically modified samples were improved with increasing compression ratio. From 25 to 40% compression, improvement of bending modulus for both modified samples were more than 10 to 25%, which was more significant for the thermally modified samples. Bending strength was also improved with increasing compression ratio, but the intensity of improvement decreased by 40% compression. Increasing of compression ratio also led to a significant improvement of the compression strength parallel to grain and hardness, which was more obvious for glutaraldehyde modified specimens than the thermally modified ones.

Keywords

References

[1] Hill, C.A.S., 2006. Wood Modification: Chemical, Thermal and Other Processes. Wiley Series in Renewable Resources. Wiley and Sons: Chichester, Sussex, UK, 260p.
[2] Kocaefe, D., Younsi, R., Poncsak, S. and Kocaefe, Y., 2007. Comparison of different models for the high-temperature heat-treatment of wood. International Journal of Thermal Sciences, 46: 707-716.
[3] Esmaeeli, N., Ghorbani, M. and Beparva, P., 2016. Determination the optimal conditions of chemical modification on Poplar wood with Glutaraldehyde and physical properties of products. Iranian Journal of Wood and Paper Science Research, 2(31): 211-223.
[4] Esmaeeli, N., Ghorbani, M. and Beparva, P., 2018. Investigation on the physical properties of poplar wood ((Populus deltoides) modified with glutaraldehyde//parafin. Iranian Journal of Wood and Paper Industries, 8(4): 617-630.
[5] Xiao, Z. Xie, Y. Militz, H. and Mai, C., 2010. Effect of glutaraldehyde on water related properties of solid wood. Holzforschung, 64: 475-482.
[6] Xie, Y., A. Hill, C.A.S., Xiao, Z., Mai, C. and Militz, H., 2011. Dynamic water vapour sorption properties of wood treated with glutaraldehyde. Journal of Wood Science and Technology, 45: 49-61.
[7] Tjeerdsma, B.F. and Militz, H., 2005. Chemical changes in hydrothermal treated wood: FTIR analysis of combined hydro thermal and dry heat-treated wood. HolzalsRoh-und Werkstoff, 63(2): 102-111.
[8] Yildiz, S. and Gumuskaya, E., 2007. The effects of thermal modification on crystalline structure of cellulose in soft and hardwood. Building and Environment, 42: 62-67.
[9] Abe, K. and Yamamoto, H., 2006. Change in mechanical interaction between cellulose microfibril and matrix substance in wood cell wall induced by hygrothermal treatment. Wood Science, (52): 107-110.
[10] Mohebby, B. and Sanaei, I., 2005. Influences of the hydro-thermal treatment on physical properties of beech wood (Fagusorientalis). The International Research Group on Wood Preservation, IRG Document No. IRG/WP 05-40303.
[11] Boonstra, M.J., Van Acker, J., Kegel, E. and Stevens, M., 2006. Optimisation of a two-stage heat treatment process: durability aspects. Journal of Wood Science and Technology, 41: 31-57.
[12] Mohebby, B., Ilbeighi, F. and Kazemi-Najafi, S. 2007. Influence of hydrothermal modification of fibers on some physical and mechanical properties of medium density fiberboard (MDF). HolzalsRoh-und Werkstoff, 66: 213-218.
[13] Sundqvist, B., Karlsson, O. and Westermark, U. 2006. Determination of formic-acid and acetic acid concentrations formed during hydrothermal treatment of birch wood and its relation to colour, strength and hardness. Wood Science and Technology, 40: 549-561.
[14] Ahmed, S.H., More´n T., Hagman O., Cloutier A., Fang Ch. and Elustondo D., 2013. Anatomical properties and process parameters affecting blister/blow formation in densified European aspen and downy birch sapwood boards by thermo-hygro-mechanical compression. Journal of Materials Science, 24(48): 8571-8579.
[15] Blomberg, J., Persson, B. and Blomberg, A., 2005. Effects of semi-isostatic densification of wood on the variation in strength properties with density. Journal of Wood Science and technology, 39(5): 339-350.
[16] Sandberg, D., Haller, P. and Navi, P., 2013. Thermo-hydro and thermohydro-mechanical wood processing an opportunity for future environmentally friendly wood products. Wood Material Science and Engineering, 8(1): 64-88.
[17] Ülker, O., İmirzi, Ö. and Burdurlu E., 2012. The effect of densification temperature on some physical and mechanical properties of Scots pine (Pinus sylvestris). Bioresources, 7(4): 5581-5592.
[18] Navi, P. and Sandberg, D., 2012. Thermo Hydro Mechanical Processing of Wood, EPFL Press, Lausanne, Switzerland, 280 p.
[19] Pandey, K.K. and Pitman, A.J., 2003. FTIR studies of the changes in wood chemistry following decay by brown-rot and white-rot fungi. International Biodeterior-ation & Biodegradation, 52(3): 151-160.
[20] Windeisen, E., Ba¨chle, H., Zimmer, B. and Wegener, G., 2009. Relations between chemical changes and mechanical properties of thermally treated wood. 10th EWLP. Stockholm, Sweden, 25-28 August.
[21] Kariz, M., Kuzman, M.K., Semek, M., Hughes, M., Rautkari, L., Kamke, F. and Kutnar, A., 2017. Influence of temperature of thermal treatment on surface densification of spruce. . European Journal of Wood and Wood Products, 75(1): 113-123.
[22] Ding, T., Gu, L. and Liu, X., 2011. Influence of steam pressure on chemical changes of heat- treated Mongolian pine wood. BioResources, 6(2): 1880-1889.
[23] Boonstra, M.J. and Tjeerdsma, B., 2006. Chemical analysis of heat treated softwoods. HolzalsRoh-und Werkstoff. 64: 204-211.
[24] Morsing, N. and Hoffmeyer, P., 1998. Densification of Wood: The influence of hygrothermal treatment on compression of beech perpendicular to gain. Kgs. Lyngby, Denmark: Technical University of Denmark (DTU). (BYG-Rapport; No. R-79).
[25] Sharifnia, H. and Mohebby, B., 2010. Enhanced Mechanical Properties of Poplar Wood by a Combined-Hydro-Thermo-Mechanical (CHTM) Modification, Iranian Journal of Wood and Paper Industreis, 1(1): 57-66.
[26] Kutnar, A., Sernek, M. 2007. Densification of wood. Zbornik Gozdarstva in Lesarstva, 82: 53-62.
[27] Gong, M., Nakatani, M., Yang, Y. and Afzal, M., 2006. Maximum compression ratios of softwoods produced in eastern Canada. In: Proceedings of the 9th World Conference on Timber Engineering. Portland, Oregon, USA, 6-10 August.
[28] Bekhta, P., Proszyk, S., Krystofiak, T. and Lis, B., 2015. Surface wettability of short-term thermo-mechanically densified wood veneers. European Journal of Wood and Wood Product, 73: 415-417.
[29] Liu, H., Shang, J., Chen, X., Kamke, F.A., and Guo, K., 2013. The influence of thermal-hydro-mechanical processing on chemical characterization of Tsuga heterophylla. Journal of Wood Science and technology, 48:373-392.
[30] Dwianto, W., Morooka, T., Norimoto, M. and Kitajima, T., 2005. Stress relaxation of sugi (Cryptomeria japonica D. Don) wood in radial compression under high temperature steam. Holzforschung, 53: 541-546.
[31] Bao, M., Huang, X., Jiang, M., Yu, W. and Yu, Y., 2017. Effect of thermo-hydro-mechanical densification on microstructure and properties of poplar wood (Populus tomentosa). Journal of Wood Science, 63(6): 591–605.
[32] Inoue, M., and Norimoto, M., 2008. Fixation of compressive deformation in wood by pre-steaming. Journal of Tropical Forest Science, 20: 273-281.
[33] Hakkou, M., Ptrissans, M., Bakali, E.I., Gerardin, P., and Zoulalian, A., 2005. Investigation of wood wettability changes and mass loss during heat treatments of wood. Holzforschung, 59: 35-37.
[34] Hakkou, M., Petrissans, M., Gerardin, P. and Zoulalian, A., 2006. Investigations of the reasons for fungal durability of heat-treated beech wood. Polymer Degradation and Stability, 91:393-397.
[35] Sivonen, H., Maunu, S.L., Sundholm, F., Jämsä, S. and Viitaniemi, P., 2002. Magnetic resonance studies of thermally modified wood. Holzforschung, 56(6): 648-654.
[36] Kartal, SN., Green, F. and Clausen, C.A., 2009. Do the unique properties of nanometals affect leachability or efficacy against fungi and termites. International Biodeterior-ation & Biodegradation, 63: 490-495.
[37] Repellin, V. and Guyonnet, R., 2005.  Evaluation of heat treated wood swelling by differential scanning calorimetry in relation with chemical composition. Holzforschung, 59(1): 28-34.
[38] Adler, D.C., Bueher, M.J., 2013. Mesoscale mechanics of wood cell walls under axial strain. Soft Matter, 9: 7138-7144.
[39] Pfriem, A., Dietrich, T. and Buchelt, B., 2012. Furfuryl alcohol impregnation for improved plasticization and fixation during the densification of wood. Holzforschung, 66: 215-218
[40] Edalat, H.R., Tabarsa, T. and Reisi, M., 2008. Densification of Paullownia wood by using of hot-press. Iranian Journal of Wood and Paper Science Researc, 2(23):136-148.
[41] Keckes, J., Burgert, I., Fru¨hmann, K., Muller, M., Kolln, K. and Hamilton, M., 2003. Cell-wall recovery after irreversible deformation of wood. Nature Materials, 2: 810-813.
[42] Mami´nski, M.Ł.J., Pawlicki A.Z. and. Parzuchowski P., 2007. Glutaraldehyde modified MUF adhesive system Improved hot water resistance. HolzalsRoh-und Werkstoff, 65: 251-253.
[43] Boruvka, V., Zeidler, A., Holeˇcek, T., and Roman DudíkR., 2018, Elastic and Strength Properties of Heat-Treated Beech and Birch Wood, Forests, 9 (4): 197-214.
[44] Winday, J.E. and Rowell, M.R., 2005. Chemistry of wood strength. In: Wood Chemistry and Wood Composites. Ed. Rowell, M.R. Taylor and Francis, Boca Raton: 303-347.
[45] Kutnar, A., Kamke, F.A. and Sernek, M., 2008. The mechanical properties of densified VTC wood relevant for structural composites. HolzalsRoh-und Werkstoff, 66(6): 439-446
[46] Inoue, M., Norimoto, M., Tanahashi, M. and Rowell, R.M., 1993. Steam heat fixation ofcompressed wood. Wood and Fiber Science, 25(3): 224-235.
[47] Buchelt, B., Dietrich, T. and Wagenfu¨hr, A., 2012. Macroscopic and microscopic monitoring of swelling of beech wood after impregnation with furfuryl alcohol. European Journal Wood Product, 70(6): 865-869.
[48] Cai, J., Yang, X., Cai, L. and Shi, S.Q., 2013. Impact of the combination of densification and thermal modification on dimensional stability and hardness of poplar lumber. Drying Technology, 31(10): 1107-1113.
[49] Zhan, J.F., Cao, J. and Gu, J.Y., 2015. Surface-densification and hightemperature hydrothermal post treatment of the Abies nephrolepis lumber (in Chinese). Journal Nanjing Forest Univ (Natural Science Edition), 39(3): 119-124.
[50] Laine, K., Rautkari, L., Hughes, M. and Kutnar, A., 2013. Reducing the setrecovery of surface densified solid Scots pine wood by hydrothermal post-treatment. European Journal of Wood Products, 71(1): 17-23.
[51] Laine, K., Segerhol, K., Wålinder, M., Rautkari, L., Hughes, M. and Lankveld. C., 2016a. Surface densification of acetylated wood. European Journal of Wood and Wood Products, 74(6): 829-835.
[52] Yildiz, U.C., Yildiz, S.G and Gezer, E.D., 2005. Mechanical properties and decay resistance of wood-polymer composites prepared from fast growing species in Turkey. Bioresource Technology, 96:1003-1011.
[53] Laine, K., Segerhol, K., Wålinder, M., Rautkari, L. and Hughes, M., 2016b. Wood densification and thermal modification: hardness, set-recovery and micromorphology. Journal of Wood Science and Technolgy, 50:883-894.
Iranian Journal of Wood and Paper Industries
Volume 11, Issue 2
September 2020
Pages 185-197

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