Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack

Abstract: This study aimed to evaluate the variations in thermal and chemical characteristics of juvenile Eucalyptus grandis wood submitted to a deterioration test by Nasutitermes termites. For this purpose, a biodeterioration test with termites was conducted according to ASTM D 3345 (2008), in whic...

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Autores principales:	Gallio,Ezequiel, Schulz,Henrique Römer, Guerreiro,Laíse, Cruz,Nidria Dias, Zanatta,Paula, Silva Júnior,Mário Antônio Pinto da, Gatto,Darci Alberto
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2020
Materias:	Chemical composition Nasutitermes thermal stability wood deterioration wood protection
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2020000200157
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spelling	oai:scielo:S0718-221X20200002001572020-05-08Thermochemical behavior of Eucalyptus grandis wood exposed to termite attackGallio,EzequielSchulz,Henrique RömerGuerreiro,LaíseCruz,Nidria DiasZanatta,PaulaSilva Júnior,Mário Antônio Pinto daGatto,Darci Alberto Chemical composition Nasutitermes thermal stability wood deterioration wood protection Abstract: This study aimed to evaluate the variations in thermal and chemical characteristics of juvenile Eucalyptus grandis wood submitted to a deterioration test by Nasutitermes termites. For this purpose, a biodeterioration test with termites was conducted according to ASTM D 3345 (2008), in which, after the end of the period corresponding to the test (40 days), we evaluated the mass loss, chemical composition and thermal stability of the main components of the deteriorated wood samples and those belonging to the control group. We found that deterioration due to exposure of the samples to Nasutitermes sp. termites caused a mass loss of 66,88% for wood with a density at 12% moisture content of 412 kg/m3. The quantitative chemical composition showed a reduction in the contents of cellulose, hemicellulose and lignin. Analysis of the variations of the organic functional groups related to the chemical composition of the wood by Fourier Transform Infrared Spectroscopy and relative intensity of the spectral bands also showed reductions, demonstrating homogeneous deterioration of the main components of the deteriorated woods. The thermal stability showed an increase in deteriorated wood for most of the temperature ranges, mainly for those that corresponded to losses in moisture and volatiles (25 °C - 100 °C), hemicelluloses (240 °C - 300 °C), celluloses, and together with initial lignin degradation (310 °C to 400 °C), possibly due to the removal of cellulose and hemicellulose, as well as the deposition of substances expelled by the termites in the cell wall. From the results, we conclude that the termites do not have specificity regarding the chemical component and that the deterioration caused variations in the chemical composition of the wood, whereas the opposite was observed for thermal stability, which presented an increase in most of the temperatures ranges for the deteriorated woods compared to the control group.info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.22 n.2 20202020-04-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2020000200157en10.4067/S0718-221X2020005000202
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Chemical composition Nasutitermes thermal stability wood deterioration wood protection
spellingShingle	Chemical composition Nasutitermes thermal stability wood deterioration wood protection Gallio,Ezequiel Schulz,Henrique Römer Guerreiro,Laíse Cruz,Nidria Dias Zanatta,Paula Silva Júnior,Mário Antônio Pinto da Gatto,Darci Alberto Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack
description	Abstract: This study aimed to evaluate the variations in thermal and chemical characteristics of juvenile Eucalyptus grandis wood submitted to a deterioration test by Nasutitermes termites. For this purpose, a biodeterioration test with termites was conducted according to ASTM D 3345 (2008), in which, after the end of the period corresponding to the test (40 days), we evaluated the mass loss, chemical composition and thermal stability of the main components of the deteriorated wood samples and those belonging to the control group. We found that deterioration due to exposure of the samples to Nasutitermes sp. termites caused a mass loss of 66,88% for wood with a density at 12% moisture content of 412 kg/m3. The quantitative chemical composition showed a reduction in the contents of cellulose, hemicellulose and lignin. Analysis of the variations of the organic functional groups related to the chemical composition of the wood by Fourier Transform Infrared Spectroscopy and relative intensity of the spectral bands also showed reductions, demonstrating homogeneous deterioration of the main components of the deteriorated woods. The thermal stability showed an increase in deteriorated wood for most of the temperature ranges, mainly for those that corresponded to losses in moisture and volatiles (25 °C - 100 °C), hemicelluloses (240 °C - 300 °C), celluloses, and together with initial lignin degradation (310 °C to 400 °C), possibly due to the removal of cellulose and hemicellulose, as well as the deposition of substances expelled by the termites in the cell wall. From the results, we conclude that the termites do not have specificity regarding the chemical component and that the deterioration caused variations in the chemical composition of the wood, whereas the opposite was observed for thermal stability, which presented an increase in most of the temperatures ranges for the deteriorated woods compared to the control group.
author	Gallio,Ezequiel Schulz,Henrique Römer Guerreiro,Laíse Cruz,Nidria Dias Zanatta,Paula Silva Júnior,Mário Antônio Pinto da Gatto,Darci Alberto
author_facet	Gallio,Ezequiel Schulz,Henrique Römer Guerreiro,Laíse Cruz,Nidria Dias Zanatta,Paula Silva Júnior,Mário Antônio Pinto da Gatto,Darci Alberto
author_sort	Gallio,Ezequiel
title	Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack
title_short	Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack
title_full	Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack
title_fullStr	Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack
title_full_unstemmed	Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack
title_sort	thermochemical behavior of eucalyptus grandis wood exposed to termite attack
publisher	Universidad del Bío-Bío
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2020000200157
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Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack

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