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Effect of Thermal Treatment on Fracture Properties and Adsorption Properties of Spruce Wood

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...

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Autores principales: Murata, Koji, Watanabe, Yasuhiro, Nakano, Takato
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5452674/
https://www.ncbi.nlm.nih.gov/pubmed/28788325
http://dx.doi.org/10.3390/ma6094186
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author Murata, Koji
Watanabe, Yasuhiro
Nakano, Takato
author_facet Murata, Koji
Watanabe, Yasuhiro
Nakano, Takato
author_sort Murata, Koji
collection PubMed
description 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.
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spelling pubmed-54526742017-07-28 Effect of Thermal Treatment on Fracture Properties and Adsorption Properties of Spruce Wood Murata, Koji Watanabe, Yasuhiro Nakano, Takato Materials (Basel) Article 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. MDPI 2013-09-18 /pmc/articles/PMC5452674/ /pubmed/28788325 http://dx.doi.org/10.3390/ma6094186 Text en © 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/).
spellingShingle Article
Murata, Koji
Watanabe, Yasuhiro
Nakano, Takato
Effect of Thermal Treatment on Fracture Properties and Adsorption Properties of Spruce Wood
title Effect of Thermal Treatment on Fracture Properties and Adsorption Properties of Spruce Wood
title_full Effect of Thermal Treatment on Fracture Properties and Adsorption Properties of Spruce Wood
title_fullStr Effect of Thermal Treatment on Fracture Properties and Adsorption Properties of Spruce Wood
title_full_unstemmed Effect of Thermal Treatment on Fracture Properties and Adsorption Properties of Spruce Wood
title_short Effect of Thermal Treatment on Fracture Properties and Adsorption Properties of Spruce Wood
title_sort effect of thermal treatment on fracture properties and adsorption properties of spruce wood
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5452674/
https://www.ncbi.nlm.nih.gov/pubmed/28788325
http://dx.doi.org/10.3390/ma6094186
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