Friday 27 May 2016

Characterization of three wood species (Oak, Teak and Chanul) before and after heat treatment

Published Date

June 2015, Volume 12, Issue 1,pp 54-62

First online: 08 May 2015

Characterization of three wood species (Oak, Teak and Chanul) before and after heat treatment

Author

B. E. B. Uribe

, O. A. Ayala

Title

Cover Date

2015-06

DOI

10.1007/s13196-015-0144-4

Print ISSN

0972-172X

Online ISSN

0976-8432

Publisher

Springer India

Author Affiliations

1. Structural Composites Laboratory, Materials Engineering Department, Engineering School of São Carlos, University of São Paulo, Av. Trabalhador Sancarlense, 400, São Carlos, SP, Brazil
2. Wood Furniture Laboratory, Furniture Technological Center, SENA, Street 63 N, 58B03, Itagüí, Antioquia, Colombia

Abstract

The aim of this work was to investigate the effect of heat treatment on some physical and mechanical properties of three timber species namely Oak (Tabebuia rosea), Teak (Tectona grandis) and Chanul (Humiriastrum procerum). Samples were exposed to different temperature levels: 130, 150, 180 and 210 °C for periods of 2, 4 and 8 h. The swelling values and moisture absorption of control and heat treated samples were evaluated after water immersion in 2 and 24 h. The hardness in wood was determined according to the Janka’s hardness method of the ball in three sectional planes. Stereoscopy and scanning electron microscopy were used to determine certain characteristics of cell wall like distortions related to variation of the different heat treatment conditions. Energy dispersive X-ray analysis showed some decreases in carbon content after heat treatment, and thermogravimetric analysis indicated the removal of lignin after 180 °C. The modulus of rupture, elastic modulus and proportional limit strength were also analyzed from flexural behavior. It was demonstrated that dimensional stability of three wood species was enhanced after heat treatment.

Keywords

Tropical woods Dimensional stability of wood Lignin Cellulose

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http://link.springer.com/article/10.1007%2Fs13196-015-0144-4

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