Chemical changes of heat treated pine and eucalypt wood monitored by FTIR

A hardwood, Eucalyptus globulus Labill., and a softwood Pinus pinaster Aiton., were heat treated at temperatures between 170 and 210ºC in an oven and in an autoclave. The samples were pre-extracted with dichloromethane, ethanol and water and ground prior to Fourier Transform Infrared (FTIR) spectros...

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Autores principales:	Esteves,B, Velez Marques,A, Domingos,I, Pereira,H
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2013
Materias:	Eucalyptus globulus FTIR Heat treatment Pinus pinaster
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2013000200010
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spelling	oai:scielo:S0718-221X20130002000102014-07-14Chemical changes of heat treated pine and eucalypt wood monitored by FTIREsteves,BVelez Marques,ADomingos,IPereira,H Eucalyptus globulus FTIR Heat treatment Pinus pinaster A hardwood, Eucalyptus globulus Labill., and a softwood Pinus pinaster Aiton., were heat treated at temperatures between 170 and 210ºC in an oven and in an autoclave. The samples were pre-extracted with dichloromethane, ethanol and water and ground prior to Fourier Transform Infrared (FTIR) spectroscopic analysis. The heat treatment caused significant changes in the chemical composition and structure of wood, in lignin and polysaccharides. Hemicelluloses were the first to degrade as proved by the initial decrease of the 1730 cm-1 peak due to the breaking of acetyl groups in xylan. Hardwood lignin changed more than softwood lignin, with a shift of maximum absorption from 1505 cm-1 to approximately 1512 cm-1 due to decrease of methoxyl groups, loss of syringyl units or breaking of aliphatic side-chains. The macromolecular structure becomes more condensed and there is a clear increase of non-conjugated (1740 cm-1) in relation to conjugated groups (1650 cm-1). However, the changes induced by the thermal treatment are difficult to monitor by FTIR spectroscopy due to the different chemical reactions occurring simultaneously.info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.15 n.2 20132013-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2013000200010en10.4067/S0718-221X2013005000020
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Eucalyptus globulus FTIR Heat treatment Pinus pinaster
spellingShingle	Eucalyptus globulus FTIR Heat treatment Pinus pinaster Esteves,B Velez Marques,A Domingos,I Pereira,H Chemical changes of heat treated pine and eucalypt wood monitored by FTIR
description	A hardwood, Eucalyptus globulus Labill., and a softwood Pinus pinaster Aiton., were heat treated at temperatures between 170 and 210ºC in an oven and in an autoclave. The samples were pre-extracted with dichloromethane, ethanol and water and ground prior to Fourier Transform Infrared (FTIR) spectroscopic analysis. The heat treatment caused significant changes in the chemical composition and structure of wood, in lignin and polysaccharides. Hemicelluloses were the first to degrade as proved by the initial decrease of the 1730 cm-1 peak due to the breaking of acetyl groups in xylan. Hardwood lignin changed more than softwood lignin, with a shift of maximum absorption from 1505 cm-1 to approximately 1512 cm-1 due to decrease of methoxyl groups, loss of syringyl units or breaking of aliphatic side-chains. The macromolecular structure becomes more condensed and there is a clear increase of non-conjugated (1740 cm-1) in relation to conjugated groups (1650 cm-1). However, the changes induced by the thermal treatment are difficult to monitor by FTIR spectroscopy due to the different chemical reactions occurring simultaneously.
author	Esteves,B Velez Marques,A Domingos,I Pereira,H
author_facet	Esteves,B Velez Marques,A Domingos,I Pereira,H
author_sort	Esteves,B
title	Chemical changes of heat treated pine and eucalypt wood monitored by FTIR
title_short	Chemical changes of heat treated pine and eucalypt wood monitored by FTIR
title_full	Chemical changes of heat treated pine and eucalypt wood monitored by FTIR
title_fullStr	Chemical changes of heat treated pine and eucalypt wood monitored by FTIR
title_full_unstemmed	Chemical changes of heat treated pine and eucalypt wood monitored by FTIR
title_sort	chemical changes of heat treated pine and eucalypt wood monitored by ftir
publisher	Universidad del Bío-Bío
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2013000200010
work_keys_str_mv	AT estevesb chemicalchangesofheattreatedpineandeucalyptwoodmonitoredbyftir AT velezmarquesa chemicalchangesofheattreatedpineandeucalyptwoodmonitoredbyftir AT domingosi chemicalchangesofheattreatedpineandeucalyptwoodmonitoredbyftir AT pereirah chemicalchangesofheattreatedpineandeucalyptwoodmonitoredbyftir
_version_	1714202569105997824

Chemical changes of heat treated pine and eucalypt wood monitored by FTIR

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