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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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The influences of boiling and drying treatments on the behaviors of tension wood with gelatinous layers in Zelkova serrata

Journal of Wood Science volume 53, pages 5–10 (2007)Cite this article

Abstract

This study examined how boiling and drying treatments influenced various physical properties of the tension wood with gelatinous fibers (G-fibers) of a 29-yearold Zelkova branch. By boiling treatment, tension wood with numerous G-fibers contracted considerably in the longitudinal direction and the longitudinal Young’s modulus decreased in spite of the water-saturated condition. The drying treatment caused green tension wood and boiled tension wood with numerous G-fibers to shrink longitudinally and increased their longitudinal Young’s moduli. These specific behaviors in tension wood were highly correlated with the proportion of G-fibers in a specimen and were probably caused by the microscopic behavior of cellulose microfibril (CMF) in the gelatinous layers (G-layers). The longitudinal shrinkage of tension wood due to drying suggests the existence of a hygro-sensible, noncrystalline region in the CMF, which is abundant in the G-layer. Furthermore, the noncrystalline region in the CMF softens during boiling treatment, resulting in the reduction of the longitudinal Young’s modulus in tension wood. The longitudinal contraction of tension wood with G-fibers by boiling might be caused by the tensile growth stress remaining in green G-layers. However, no changes were detected in the 004 d-spacing of cellulose crystal in tension wood from the boiling and drying treatments, regardless of the proportion of G-fibers.

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Authors and Affiliations

  1. Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601, Japan

    Kentaro Abe & Hiroyuki Yamamoto

  2. Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto, 611-0011, Japan

    Kentaro Abe

Authors
  1. Kentaro Abe
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  2. Hiroyuki Yamamoto
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Correspondence to Kentaro Abe.

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Abe, K., Yamamoto, H. The influences of boiling and drying treatments on the behaviors of tension wood with gelatinous layers in Zelkova serrata . J Wood Sci 53, 5–10 (2007). https://doi.org/10.1007/s10086-006-0815-2

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  • DOI: https://doi.org/10.1007/s10086-006-0815-2

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