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Changes in vibrational properties of compression wood in conifer due to hygrothermal treatment and their relationship with hygrothermal recovery strain

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Abstract

To clarify the mechanism of irreversible dimensional changes due to the hygrothermal treatment of green wood, i.e., the hygrothermal recovery (HTR), the changes in vibrational properties of compression wood and normal wood were measured after hygrothermal treatment at 60 °C, 80 °C, and 100 °C. In addition, the relationship between those changes and HTR strains were discussed. The hygrothermal treatment induced an increase in mechanical loss tangent (tanδ) and decrease in specific dynamic Young’s modulus (E′/ρ). It seems that the changes in vibrational properties due to hygrothermal treatment had a time–temperature dependency: Higher temperatures and longer treatment durations induce larger increases in tanδ and larger decreases in E′/ρ. In contrast to the quenching effect, tanδ and E′/ρ did not recover to their original state even after 60 days of conditioning in water at 20 °C. For compression wood with a large microfibril angle (MFA), there was a clear relationship between the changes in vibrational properties and HTR strains. The tanδ increased and E′/ρ decreased with hygrothermal treatment, corresponding to dimensional changes in the L-direction. This suggests that structural changes in wood components are responsible for HTR. The most likely mechanism for HTR is that the hygrothermal treatment softens the lignin to release locked-in growth stress. Subsequently, irreversible structural changes in lignin induce both the changes in vibrational properties and HTR. For normal wood, because of the small MFA, the structural changes in lignin in the L-direction are possibly restricted by crystalline cellulose. As a result, the relationship between the changes in vibrational properties and HTR is uncertain.

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Acknowledgements

The authors wish to express their thanks to Associate Professor Eiichi Obataya in University of Tsukuba for his suggestion and discussion of this study. This work was supported by The Foundation of PHOENIX.

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  1. Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan

    Shuoye Chen, Miyuki Matsuo-Ueda, Masato Yoshida & Hiroyuki Yamamoto

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  1. Shuoye Chen
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  2. Miyuki Matsuo-Ueda
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Correspondence to Shuoye Chen or Hiroyuki Yamamoto.

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Chen, S., Matsuo-Ueda, M., Yoshida, M. et al. Changes in vibrational properties of compression wood in conifer due to hygrothermal treatment and their relationship with hygrothermal recovery strain. J Mater Sci 54, 3069–3081 (2019). https://doi.org/10.1007/s10853-018-3082-x

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  • DOI: https://doi.org/10.1007/s10853-018-3082-x

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