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Title: Effect of Thermal Treatment on Fracture Properties and Adsorption Properties of Spruce Wood
Authors: Murata, Koji  kyouindb  KAKEN_id
Watanabe, Yasuhiro
Nakano, Takato
Author's alias: 村田, 功二
Keywords: wood
thermal treatment
fracture energy
strain-softening behavior
fiber saturation point
adsorption isotherm
Issue Date: 18-Sep-2013
Publisher: MDPI
Journal title: Materials
Volume: 6
Issue: 9
Start page: 4186
End page: 4197
Abstract: The effect of thermal treatment on spruce is examined by analyzing the fracture and hygroscopic properties. Specimens were heated at temperatures within the range 120–200 °C for 1 h. Fracture energy was measured using a single-edge notched bending test and the strain-softening index was estimated by dividing the fracture energy by the maximum load. Adsorption properties were estimated using adsorption isotherms. Fiber saturation points (FSPs) were estimated by extrapolating the moisture adsorption isotherm curve. Langmuir’s adsorption coefficient and number of adsorption sites were obtained using Langmuir’s theory and the Hailwood-Horrobin theory, respectively. The fracture energy, FSPs, and specimen weights decreased at temperatures higher than 150 °C, but the critical point for the strain-softening index and the number of adsorption sites was shown to be 180 °C. We hypothesize that the fracture energy and FSP depend on the chemical structure of the cell wall, whereas the strain-softening behavior may be influenced by the number of adsorption sites, and in turn the number of hydrogen bonds in hemicellulose.
Rights: © 2013 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
URI: http://hdl.handle.net/2433/178752
DOI(Published Version): 10.3390/ma6094186
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