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Wood Science and Technology

, Volume 53, Issue 1, pp 151–164 | Cite as

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

  • Nanami Zeniya
  • Kaoru Endo-Ujiie
  • Eiichi ObatayaEmail author
  • Akiko Nakagawa-Izumi
  • Miyuki Matsuo-Ueda
Original
  • 82 Downloads

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.

Notes

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Nanami Zeniya
    • 1
  • Kaoru Endo-Ujiie
    • 1
  • Eiichi Obataya
    • 1
    Email author
  • Akiko Nakagawa-Izumi
    • 1
  • Miyuki Matsuo-Ueda
    • 2
  1. 1.Graduate School of Life and Environmental SciencesTsukuba UniversityTsukubaJapan
  2. 2.Graduate School of Bioagricultural SciencesNagoya UniversityNagoyaJapan

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