Effect of Heat Treatment on the Physic-Mechanical Characteristics of Eucalyptusurophylla S.T. Blake

Eucalyptus plantations wood have great potential application in high quality solid wood product. In order to improve the overall characteristics, heat treatments (HT) were carried out using Eucalyptus urophylla S.T. Blake wood at 150, 170 and 190 °C, for 2 and 4 h, separately. The...

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Autores principales:	Lin Yang, Honghui Jin
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	eucalyptus heat treatment dimensional stability physic-mechanical property wood color Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/f261fd99222645bf8a5c57f788ab1f66
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spelling	oai:doaj.org-article:f261fd99222645bf8a5c57f788ab1f662021-11-11T18:10:17ZEffect of Heat Treatment on the Physic-Mechanical Characteristics of <i>Eucalyptus</i><i>urophylla</i> S.T. Blake10.3390/ma142166431996-1944https://doaj.org/article/f261fd99222645bf8a5c57f788ab1f662021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6643https://doaj.org/toc/1996-1944Eucalyptus plantations wood have great potential application in high quality solid wood product. In order to improve the overall characteristics, heat treatments (HT) were carried out using <i>Eucalyptus urophylla</i> S.T. Blake wood at 150, 170 and 190 °C, for 2 and 4 h, separately. The effects of HT on physical and mechanical properties, wood color, dimensional stability and chemical change were investigated. The results indicate that: Mass loss (<i>ML</i>) of wood at a moderate temperature of 150 °C was small, but increased remarkably when temperature exceeds 170 °C. A maximum <i>ML</i> of 5.83% was observed at 190 °C/4 h; the velocity of water vapor adsorption and equilibrium moisture content (<i>EMC</i>) of HT wood decreased significantly, and varied considerably with treating severity; absolute dry density of HT wood decreased, presenting a similar tendency with <i>ML</i>, but the reduction was greater than <i>ML</i>; HT reduced the tangential and radial swelling ratio and swelling coefficients of wood, and improved the dimensional stability by 71.88% at 190 °C; modulus of rupture (MOR) and modulus of elasticity (MOE) of HT wood varied significantly in severer conditions, but there were no obvious changes in a moderate conditions at 150 °C; there was a slight color change at 150 °C, but wood color became more dark and uniform with treating severity; HT decreased the relative content of hydroxyl groups in wood components, improving wood dimensional stability. Color change of wood may be caused by variations of chromophoric groups and its own structure of lignin due to HT. Moderate temperature HT at 150 °C improved dimensional stability and color uniform of wood, but without reducing mechanical stress. This is a practical HT condition for <i>Eucalyptus urophylla</i> S.T. Blake.Lin YangHonghui JinMDPI AGarticleeucalyptusheat treatmentdimensional stabilityphysic-mechanical propertywood colorTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6643, p 6643 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	eucalyptus heat treatment dimensional stability physic-mechanical property wood color Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	eucalyptus heat treatment dimensional stability physic-mechanical property wood color Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Lin Yang Honghui Jin Effect of Heat Treatment on the Physic-Mechanical Characteristics of <i>Eucalyptus</i><i>urophylla</i> S.T. Blake
description	Eucalyptus plantations wood have great potential application in high quality solid wood product. In order to improve the overall characteristics, heat treatments (HT) were carried out using <i>Eucalyptus urophylla</i> S.T. Blake wood at 150, 170 and 190 °C, for 2 and 4 h, separately. The effects of HT on physical and mechanical properties, wood color, dimensional stability and chemical change were investigated. The results indicate that: Mass loss (<i>ML</i>) of wood at a moderate temperature of 150 °C was small, but increased remarkably when temperature exceeds 170 °C. A maximum <i>ML</i> of 5.83% was observed at 190 °C/4 h; the velocity of water vapor adsorption and equilibrium moisture content (<i>EMC</i>) of HT wood decreased significantly, and varied considerably with treating severity; absolute dry density of HT wood decreased, presenting a similar tendency with <i>ML</i>, but the reduction was greater than <i>ML</i>; HT reduced the tangential and radial swelling ratio and swelling coefficients of wood, and improved the dimensional stability by 71.88% at 190 °C; modulus of rupture (MOR) and modulus of elasticity (MOE) of HT wood varied significantly in severer conditions, but there were no obvious changes in a moderate conditions at 150 °C; there was a slight color change at 150 °C, but wood color became more dark and uniform with treating severity; HT decreased the relative content of hydroxyl groups in wood components, improving wood dimensional stability. Color change of wood may be caused by variations of chromophoric groups and its own structure of lignin due to HT. Moderate temperature HT at 150 °C improved dimensional stability and color uniform of wood, but without reducing mechanical stress. This is a practical HT condition for <i>Eucalyptus urophylla</i> S.T. Blake.
format	article
author	Lin Yang Honghui Jin
author_facet	Lin Yang Honghui Jin
author_sort	Lin Yang
title	Effect of Heat Treatment on the Physic-Mechanical Characteristics of <i>Eucalyptus</i><i>urophylla</i> S.T. Blake
title_short	Effect of Heat Treatment on the Physic-Mechanical Characteristics of <i>Eucalyptus</i><i>urophylla</i> S.T. Blake
title_full	Effect of Heat Treatment on the Physic-Mechanical Characteristics of <i>Eucalyptus</i><i>urophylla</i> S.T. Blake
title_fullStr	Effect of Heat Treatment on the Physic-Mechanical Characteristics of <i>Eucalyptus</i><i>urophylla</i> S.T. Blake
title_full_unstemmed	Effect of Heat Treatment on the Physic-Mechanical Characteristics of <i>Eucalyptus</i><i>urophylla</i> S.T. Blake
title_sort	effect of heat treatment on the physic-mechanical characteristics of <i>eucalyptus</i><i>urophylla</i> s.t. blake
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/f261fd99222645bf8a5c57f788ab1f66
work_keys_str_mv	AT linyang effectofheattreatmentonthephysicmechanicalcharacteristicsofieucalyptusiiurophyllaistblake AT honghuijin effectofheattreatmentonthephysicmechanicalcharacteristicsofieucalyptusiiurophyllaistblake
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Effect of Heat Treatment on the Physic-Mechanical Characteristics of <i>Eucalyptus</i><i>urophylla</i> S.T. Blake

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