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Compression behaviors of acetylated wood in organic liquids. Part II. Drying-set and its recovery

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Abstract

Unmodified and acetylated cedar wood specimens were swollen in various liquids and dried under radial compression. Two stress relaxation processes were observed during drying, and the second process observed below the fiber saturation point was responsible for the drying-set and the temporary fixation of compressive deformation. The fixed shape of acetylated wood was partly recovered by soaking it in water and toluene and completely recovered in acetone. The effective shape fixation and recovery of toluene-swollen samples implied that the intermolecular hydrogen bonding was not necessary for the drying-set of acetylated wood. The degree of shape recovery was not explained by initial softening, while the acetylated wood always exhibited greater recoverability than unmodified wood. Although 85% stiffness was lost after large compression set and recovery of unmodified wood, such a stiffness loss was limited to 39% when the acetylated wood was processed with organic liquids. This indicated that the swelling of the hydrophobic region in the acetylated wood was effective in preventing mechanical damage due to large compressive deformation.

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Authors and Affiliations

  1. Graduate School of Life and Environmental Sciences, University of Tsukuba, 305-8572, Ibaraki, Japan

    Eiichi Obataya

  2. Institute of Wood Technology, Akita Prefectural University, 016-0876, Noshiro, Akita, Japan

    Hidefumi Yamauchi

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  1. Eiichi Obataya
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  2. Hidefumi Yamauchi
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Correspondence to Eiichi Obataya.

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Obataya, E., Yamauchi, H. Compression behaviors of acetylated wood in organic liquids. Part II. Drying-set and its recovery. Wood Sci Technol 39, 546–559 (2005). https://doi.org/10.1007/s00226-005-0019-8

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  • DOI: https://doi.org/10.1007/s00226-005-0019-8

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