Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions

Detalhes bibliográficos
Autor(a) principal: Moura, Luiz Fernando de
Data de Publicação: 2016
Outros Autores: Brito, José Otávio, Silva Júnior, Francides Gomes da
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/14809
Resumo: Thermal treatment (thermal rectification) is a process in which technological properties of wood are modified using thermal energy, the result of which is often value-added wood. Thermally treated wood takes on similar color shades to tropical woods and offers considerable resistance to destructive microorganisms and climate action, in addition to having high dimensional stability and low hygroscopicity. Wood samples of Eucalyptus grandis were subjected to various thermal treatments, as performed in presence (140ºC; 160ºC; 180ºC) or in absence of oxygen (160ºC; 180ºC; 200ºC) inside a thermal treatment chamber, and then studied as to their chemical characteristics. Increasing the maximum treatment temperatures led to a reduction in the holocellulose content of samples as a result of the degradation and volatilization of hemicelluloses, also leading to an increase in the relative lignin content. Except for glucose, all monosaccharide levels were found to decrease in samples after the thermal treatment at a maximum temperature of 200ºC. The thermal treatment above 160ºC led to increased levels of total extractives in the wood samples, probably ascribed to the emergence of low molecular weight substances as a result of thermal degradation. Overall, it was not possible to clearly determine the effect of presence or absence of oxygen in the air during thermal treatment on the chemical characteristics of the relevant wood samples.
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spelling Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditionsEfeito da termorretificação nas características químicas da madeira de Eucalyptus grandis W. Hill ex Maiden tratada sob diferentes condições de atmosferaHeat treatmentWood chemistryEucalyptusTratamento térmicoQuímica da madeiraEucaliptoThermal treatment (thermal rectification) is a process in which technological properties of wood are modified using thermal energy, the result of which is often value-added wood. Thermally treated wood takes on similar color shades to tropical woods and offers considerable resistance to destructive microorganisms and climate action, in addition to having high dimensional stability and low hygroscopicity. Wood samples of Eucalyptus grandis were subjected to various thermal treatments, as performed in presence (140ºC; 160ºC; 180ºC) or in absence of oxygen (160ºC; 180ºC; 200ºC) inside a thermal treatment chamber, and then studied as to their chemical characteristics. Increasing the maximum treatment temperatures led to a reduction in the holocellulose content of samples as a result of the degradation and volatilization of hemicelluloses, also leading to an increase in the relative lignin content. Except for glucose, all monosaccharide levels were found to decrease in samples after the thermal treatment at a maximum temperature of 200ºC. The thermal treatment above 160ºC led to increased levels of total extractives in the wood samples, probably ascribed to the emergence of low molecular weight substances as a result of thermal degradation. Overall, it was not possible to clearly determine the effect of presence or absence of oxygen in the air during thermal treatment on the chemical characteristics of the relevant wood samples.A termorretificação (ou retificação térmica) é um processo de alteração das propriedades tecnológicas da madeira, utilizando-se energia térmica, cujos resultados obtidos, normalmente, resultam na agregação de valor à madeira. A madeira termorretificada adquire colorações semelhantes àquelas de madeiras tropicais, considerável resistência aos microorganismos xilófagos e à ação climática, alta estabilidade dimensional e baixa higroscopicidade. Amostras de Eucalyptus grandis foram submetidas a diversos tratamentos de termorretificação, executados em presença (140ºC; 160ºC; 180ºC) ou escassez de oxigênio (160ºC; 180ºC; 200ºC) na atmosfera do interior da câmara de tratamento térmico, e estudadas quanto às suas características químicas. O aumento das temperaturas máximas de tratamento causou redução no teor de holocelulose das amostras, em razão da degradação e volatilização de hemiceluloses, além de proporcionar um incremento no teor relativo de lignina. Todos os monossacarídeos, com exceção da glicose, tiveram sua proporção reduzida na madeira após o tratamento térmico à temperatura máxima de 200ºC. A termorretificação acima de 160ºC levou a um incremento no teor de extrativos totais da madeira, provavelmente atribuído ao surgimento de substâncias de peso molecular reduzido, em razão da degradação térmica. De maneira geral, não foi possível determinar com clareza o efeito das condições de presença ou escassez de oxigênio do ar durante a termorretificação sobre as características químicas da madeira tratada.Universidade Federal de Lavras (UFLA)2016-04-052017-08-01T20:17:04Z2017-08-01T20:17:04Z2017-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfMOURA, L. F. de; BRITO, J. O.; SILVA JÚNIOR, F. G. da. Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions. CERNE, Lavras, v. 18, n. 3, p. 449-455, jul./set. 2012.http://repositorio.ufla.br/jspui/handle/1/148092317-63420104-7760reponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAengCopyright (c) 2016 CERNEAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessMoura, Luiz Fernando deBrito, José OtávioSilva Júnior, Francides Gomes da2021-02-27T20:04:32Zoai:localhost:1/14809Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2021-02-27T20:04:32Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions
Efeito da termorretificação nas características químicas da madeira de Eucalyptus grandis W. Hill ex Maiden tratada sob diferentes condições de atmosfera
title Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions
spellingShingle Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions
Moura, Luiz Fernando de
Heat treatment
Wood chemistry
Eucalyptus
Tratamento térmico
Química da madeira
Eucalipto
title_short Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions
title_full Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions
title_fullStr Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions
title_full_unstemmed Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions
title_sort Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions
author Moura, Luiz Fernando de
author_facet Moura, Luiz Fernando de
Brito, José Otávio
Silva Júnior, Francides Gomes da
author_role author
author2 Brito, José Otávio
Silva Júnior, Francides Gomes da
author2_role author
author
dc.contributor.author.fl_str_mv Moura, Luiz Fernando de
Brito, José Otávio
Silva Júnior, Francides Gomes da
dc.subject.por.fl_str_mv Heat treatment
Wood chemistry
Eucalyptus
Tratamento térmico
Química da madeira
Eucalipto
topic Heat treatment
Wood chemistry
Eucalyptus
Tratamento térmico
Química da madeira
Eucalipto
description Thermal treatment (thermal rectification) is a process in which technological properties of wood are modified using thermal energy, the result of which is often value-added wood. Thermally treated wood takes on similar color shades to tropical woods and offers considerable resistance to destructive microorganisms and climate action, in addition to having high dimensional stability and low hygroscopicity. Wood samples of Eucalyptus grandis were subjected to various thermal treatments, as performed in presence (140ºC; 160ºC; 180ºC) or in absence of oxygen (160ºC; 180ºC; 200ºC) inside a thermal treatment chamber, and then studied as to their chemical characteristics. Increasing the maximum treatment temperatures led to a reduction in the holocellulose content of samples as a result of the degradation and volatilization of hemicelluloses, also leading to an increase in the relative lignin content. Except for glucose, all monosaccharide levels were found to decrease in samples after the thermal treatment at a maximum temperature of 200ºC. The thermal treatment above 160ºC led to increased levels of total extractives in the wood samples, probably ascribed to the emergence of low molecular weight substances as a result of thermal degradation. Overall, it was not possible to clearly determine the effect of presence or absence of oxygen in the air during thermal treatment on the chemical characteristics of the relevant wood samples.
publishDate 2016
dc.date.none.fl_str_mv 2016-04-05
2017-08-01T20:17:04Z
2017-08-01T20:17:04Z
2017-08-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv MOURA, L. F. de; BRITO, J. O.; SILVA JÚNIOR, F. G. da. Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions. CERNE, Lavras, v. 18, n. 3, p. 449-455, jul./set. 2012.
http://repositorio.ufla.br/jspui/handle/1/14809
identifier_str_mv MOURA, L. F. de; BRITO, J. O.; SILVA JÚNIOR, F. G. da. Effect of the thermal treatment on the chemical characteristics of wood from Eucalyptus grandis W. Hill ex Maiden under different atmospheric conditions. CERNE, Lavras, v. 18, n. 3, p. 449-455, jul./set. 2012.
url http://repositorio.ufla.br/jspui/handle/1/14809
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv Copyright (c) 2016 CERNE
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2016 CERNE
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal de Lavras (UFLA)
publisher.none.fl_str_mv Universidade Federal de Lavras (UFLA)
dc.source.none.fl_str_mv 2317-6342
0104-7760
reponame:Repositório Institucional da UFLA
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instname_str Universidade Federal de Lavras (UFLA)
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institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
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