Effects of water-soluble extractives on the vibrational properties and color of hygrothermally treated spruce wood
| Autor: | Akiko Nakagawa-Izumi, Miyuki Matsuo-Ueda, Nanami Zeniya, Eiichi Obataya, Kaoru Endo-Ujiie |
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| Rok vydání: | 2018 |
| Předmět: |
040101 forestry
0106 biological sciences Depolymerization Chemistry Plasticizer Analytical chemistry Forestry 04 agricultural and veterinary sciences Plant Science 01 natural sciences Industrial and Manufacturing Engineering Water soluble 010608 biotechnology 0401 agriculture forestry and fisheries General Materials Science Relative humidity |
| Zdroj: | Wood Science and Technology. 53:151-164 |
| ISSN: | 1432-5225 0043-7719 |
| DOI: | 10.1007/s00226-018-1069-z |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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