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Wood Science and Technology

Erschienen in:

17.11.2018 | Original

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

verfasst von: Nanami Zeniya, Kaoru Endo-Ujiie, Eiichi Obataya, Akiko Nakagawa-Izumi, Miyuki Matsuo-Ueda

Erschienen in: Wood Science and Technology | Ausgabe 1/2019

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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.

Vorheriger Artikel Inhibitory effects of Moso bamboo (Phyllostachys heterocycla f. pubescens) extracts on phytopathogenic bacterial and fungal growth

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Titel: Effects of water-soluble extractives on the vibrational properties and color of hygrothermally treated spruce wood
verfasst von: Nanami Zeniya
Kaoru Endo-Ujiie
Eiichi Obataya
Akiko Nakagawa-Izumi
Miyuki Matsuo-Ueda
Publikationsdatum: 17.11.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: Wood Science and Technology / Ausgabe 1/2019
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI: https://doi.org/10.1007/s00226-018-1069-z

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