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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Thermal-softening properties and cooling set of water-saturated bamboo within proportional limit

Journal of Wood Science volume 54, pages 278–284 (2008)Cite this article

Abstract

Thermal-softening properties and cooling set of water-saturated bamboo were investigated using stressrelaxation measurements in heating and cooling processes, followed by residual deflection measurement. In the heating process, an obvious decrease in relative relaxation modulus due to thermal-softening of lignin was found at around 60°C. On the other hand, no clear change in the relative relaxation modulus was recognized in the cooling process. After the cooling process, about 65% and 75% of residual set was measured when the specimen was loaded on the epidermis and endodermis side, respectively. Also, residual set depended on the maximum temperature reached in the heating process and the unloaded temperature in the cooling process. From these results, it was deduced that the glass transition of lignin from the rubbery to glassy state is important to fix the deformation. Comparing thermal-softening behavior between bamboo and wood, the relative relaxation modulus of wood decreased steeply at higher temperatures than for bamboo. On the other hand, while about 75% of residual set was also found for wood, almost the same as for bamboo, the recovery of deformation with time was larger for wood than for bamboo.

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Authors and Affiliations

  1. Research Division of Agriculture, Graduate School of Kyoto Prefectural University, 1-5 Shimogamo Hangi-cho, Sakyo-ku, Kyoto, 606-8522, Japan

    Masamitsu Nakajima, Yuzo Furuta & Yutaka Ishimaru

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  1. Masamitsu Nakajima
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  2. Yuzo Furuta
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  3. Yutaka Ishimaru
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Correspondence to Masamitsu Nakajima.

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Part of this article was presented at the 53rd Annual Meeting of the Japan Zairyou Society, Okayama, May 2004

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Nakajima, M., Furuta, Y. & Ishimaru, Y. Thermal-softening properties and cooling set of water-saturated bamboo within proportional limit. J Wood Sci 54, 278–284 (2008). https://doi.org/10.1007/s10086-008-0952-x

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  • DOI: https://doi.org/10.1007/s10086-008-0952-x

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