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Effects of water-soluble extractives on the vibrational properties and color of hygrothermally treated spruce wood

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Abstract

Sitka spruce wood specimens were heated at 120–140 °C and different relative humidity values (RHh), and their specific dynamic Young’s moduli (E′/ρ), mechanical loss tangents (tanδ), and CIELAB color parameters were measured at 25 °C and 60% relative humidity before and after the removal of water-soluble extractives. The E′/ρ and tanδ values were significantly decreased and increased, respectively, with increases in mass loss by heating at 100% RHh. After the removal of water-soluble extractives, the decreased E′/ρ was increased and the increased tanδ was decreased. This suggested that water-soluble sugars, i.e., depolymerization products of hemicelluloses, acted as plasticizers to decrease E′/ρ and increase tanδ values of hygrothermally treated wood, particularly for wood heated in humid conditions. By heating at 60–75% RHh, the E′/ρ was slightly increased and tanδ was almost unchanged. The water-soluble extractives had little effect on the color of the hygrothermally treated wood, irrespective of RHh.

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Authors and Affiliations

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

    Nanami Zeniya, Kaoru Endo-Ujiie, Eiichi Obataya & Akiko Nakagawa-Izumi

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

    Miyuki Matsuo-Ueda

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  1. Nanami Zeniya
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  2. Kaoru Endo-Ujiie
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  3. Eiichi Obataya
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  4. Akiko Nakagawa-Izumi
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  5. Miyuki Matsuo-Ueda
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Correspondence to Eiichi Obataya.

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Zeniya, N., Endo-Ujiie, K., Obataya, E. et al. Effects of water-soluble extractives on the vibrational properties and color of hygrothermally treated spruce wood. Wood Sci Technol 53, 151–164 (2019). https://doi.org/10.1007/s00226-018-1069-z

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