Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas

Detalhes bibliográficos
Autor(a) principal: Nunes, Cintia Silva
Data de Publicação: 2012
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRRJ
Texto Completo: https://tede.ufrrj.br/jspui/handle/jspui/1560
Resumo: Heat treatment provides desirable characteristics to the wood such as higher dimensional stability, higher natural durability and, in some cases, changes on original color. However, the treatment can also drastically alter the physical and chemical characteristics of wood surfaces, which affect the adhesion quality and coating application. In this context, the objectives of this study were: (1) to evaluate the effect of heat treatmens on physical properties (density, equilibrium moisture content and mass loss) of Corymbia citriodora (Hook.) K.D. Hill & L.A.S. Johnson and Eucalyptus pellita F. Muell. woods; (2) to determine the effect of heat treatment on color change of both woods; (3) to evaluate the effect of heat treatments on adhesion quality of glued joints by shear strength testing; and (4) to evaluate the effect of physical and chemical modifications following heat treatment on adhesion characteristics. Heat treatments were performed in a laboratorial electric oven at 180 and 200?C. Color measurements were carried out on the CIE-L*a*b* space by using the CM-2600d portable spectrophotometer. Shear strength tests of the glued joints and solid woods were performed according to ASTM D 905 and ASTM D 143 standards, respectively. Three adhesive types were used: resorcinol, resorcinol-tannin 80:20 and resorcinol-tannin 60:40. Density and equilibrium moisture content of both wood species were reduzed by heat treatment. Both woods had mass loss, which increased with the increase of temperature and was more pronounced for Eucalyptus pellita. The original color of the woods changed following heat treatment, mainly to Eucalyptus pellita. The shear strength of solid wood and glued joints of both species was severely affected by heat treatments. The resorcinol-tannin 80:20 adhesive showed the best performance for untreated woods, however, after heat treatment, the adhesive type did not affect the shear strength. Glued joints of heat-treated woods had high percentage of wood failure due to higher porosity and adhesive penetration. The acidity of heat-treated woods affected the shear strength and presented a strong correlation with equilibrium moisture content due to degradation of hemicelluloses. Heat treatments at 180 and 200oC are extremely severe to Corymbia citriodora and Eucalyptus pellita woods
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spelling Garcia, Rosilei Aparecida252.216.258-65http://lattes.cnpq.br/7750485701838003Nascimento, Alexandre Miguel do474.417.396-91http://lattes.cnpq.br/3579375199519821Lelis, Roberto Carlos Costa328.792.886-49http://lattes.cnpq.br/5175502780570226Vidaurre, Graziela BaptistaCarvalho, Alexandre Monteiro de116.797.837-42http://lattes.cnpq.br/2686808451602310Nunes, Cintia Silva2017-04-27T11:59:34Z2012-06-29NUNES, Cintia Silva. Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas. 2012. 56 f. Disserta??o (Mestrado em Ci?ncias Ambientais e Florestais) - Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, Serop?dica, 2012.https://tede.ufrrj.br/jspui/handle/jspui/1560Heat treatment provides desirable characteristics to the wood such as higher dimensional stability, higher natural durability and, in some cases, changes on original color. However, the treatment can also drastically alter the physical and chemical characteristics of wood surfaces, which affect the adhesion quality and coating application. In this context, the objectives of this study were: (1) to evaluate the effect of heat treatmens on physical properties (density, equilibrium moisture content and mass loss) of Corymbia citriodora (Hook.) K.D. Hill & L.A.S. Johnson and Eucalyptus pellita F. Muell. woods; (2) to determine the effect of heat treatment on color change of both woods; (3) to evaluate the effect of heat treatments on adhesion quality of glued joints by shear strength testing; and (4) to evaluate the effect of physical and chemical modifications following heat treatment on adhesion characteristics. Heat treatments were performed in a laboratorial electric oven at 180 and 200?C. Color measurements were carried out on the CIE-L*a*b* space by using the CM-2600d portable spectrophotometer. Shear strength tests of the glued joints and solid woods were performed according to ASTM D 905 and ASTM D 143 standards, respectively. Three adhesive types were used: resorcinol, resorcinol-tannin 80:20 and resorcinol-tannin 60:40. Density and equilibrium moisture content of both wood species were reduzed by heat treatment. Both woods had mass loss, which increased with the increase of temperature and was more pronounced for Eucalyptus pellita. The original color of the woods changed following heat treatment, mainly to Eucalyptus pellita. The shear strength of solid wood and glued joints of both species was severely affected by heat treatments. The resorcinol-tannin 80:20 adhesive showed the best performance for untreated woods, however, after heat treatment, the adhesive type did not affect the shear strength. Glued joints of heat-treated woods had high percentage of wood failure due to higher porosity and adhesive penetration. The acidity of heat-treated woods affected the shear strength and presented a strong correlation with equilibrium moisture content due to degradation of hemicelluloses. Heat treatments at 180 and 200oC are extremely severe to Corymbia citriodora and Eucalyptus pellita woodsO tratamento de termorretifica??o proporciona ? madeira caracter?sticas desej?veis tais como maior estabilidade dimensional, maior durabilidade natural e, em alguns casos, altera??o da cor original. Entretanto, o tratamento tamb?m pode alterar drasticamente as caracter?sticas f?sicas e qu?micas das superf?cies da madeira, as quais afetam a qualidade de ades?o e a aplica??o de revestimentos. Neste contexto, os objetivos deste estudo foram: (1) avaliar o efeito dos tratamentos nas propriedades f?sicas (densidade, teor de umidade de equil?brio e perda de massa) da madeira de Corymbia citriodora (Hook.) K.D. Hill & L.A.S. Johnson e Eucalyptus pellita F. Muell.; (2) determinar o efeito dos tratamentos termorretificadores na altera??o da cor da madeira de ambas as esp?cies; (3) avaliar o efeito dos tratamentos na qualidade de ades?o de juntas coladas atrav?s de testes de resist?ncia ao cisalhamento; e (4) avaliar o efeito das altera??es f?sicas e qu?micas causadas pela termorretifica??o nas caracter?sticas de ades?o. A termorretifica??o foi realizada em um forno mufla el?trico laboratorial a 180 e 200?C. As medi??es de cor foram realizadas no espa?o CIE-L*a*b* com o aux?lio do espectrofot?metro port?til CM-2600d. Os ensaios de cisalhamento das juntas de madeira colada e das madeiras s?lidas foram realizados segundo as normas ASTM D 905 e ASTM D 143, respectivamente. Foram utilizados tr?s tipos de adesivos: resorcinol, resorcinol-tanino 80:20 e resorcinol-tanino 60:40. A densidade aparente e o teor de umidade de equil?brio das madeiras de ambas as esp?cies foram reduzidos pela termorretifica??o. Ambas as madeiras apresentaram perda de massa, sendo esta crescente com o aumento da temperatura e mais acentuada para a madeira de Eucalyptus pellita. A cor original das madeiras foi alterada pelo tratamento, principalmente para o Eucalyptus pellita. A resist?ncia ao cisalhamento da madeira s?lida e das juntas coladas de ambas as esp?cies foi severamente afetada pelos tratamentos termorretificadores. O adesivo resorcinol-tanino 80:20 apresentou o melhor desempenho para as madeiras n?o termorretificadas de ambas as esp?cies; entretanto, ap?s a termorretifica??o, o tipo de adesivo n?o afetou a resist?ncia ao cisalhamento. As juntas coladas das amostras de madeiras termorretificadas apresentaram uma alta porcentagem de falhas na madeira devido ? maior porosidade e maior penetra??o do adesivo. A acidez das amostras da madeira termorretificada afetou a resist?ncia ao cisalhamento e apresentou uma forte correla??o com o teor de umidade de equil?brio devido ? degrada??o das hemiceluloses. Os tratamentos termorretificadores a 180 e 200?C s?o extremamente severos para as madeiras de Corymbia citriodora e Eucalyptus pellitaSubmitted by Sandra Pereira (srpereira@ufrrj.br) on 2017-04-27T11:59:34Z No. of bitstreams: 1 2012 - Cintia Silva Nunes.pdf: 1126230 bytes, checksum: 45346dd33d53277fd3bc88d1d3d22157 (MD5)Made available in DSpace on 2017-04-27T11:59:34Z (GMT). No. of bitstreams: 1 2012 - Cintia Silva Nunes.pdf: 1126230 bytes, checksum: 45346dd33d53277fd3bc88d1d3d22157 (MD5) Previous issue date: 2012-06-29CAPES - Coordena??o de Aperfei?oamento de Pessoal de N?vel Superiorapplication/pdfhttps://tede.ufrrj.br/retrieve/5376/2012%20-%20Cintia%20Silva%20Nunes.pdf.jpghttps://tede.ufrrj.br/retrieve/20092/2012%20-%20Cintia%20Silva%20Nunes.pdf.jpghttps://tede.ufrrj.br/retrieve/26457/2012%20-%20Cintia%20Silva%20Nunes.pdf.jpghttps://tede.ufrrj.br/retrieve/32860/2012%20-%20Cintia%20Silva%20Nunes.pdf.jpghttps://tede.ufrrj.br/retrieve/39252/2012%20-%20Cintia%20Silva%20Nunes.pdf.jpghttps://tede.ufrrj.br/retrieve/45622/2012%20-%20Cintia%20Silva%20Nunes.pdf.jpghttps://tede.ufrrj.br/retrieve/51982/2012%20-%20Cintia%20Silva%20Nunes.pdf.jpghttps://tede.ufrrj.br/retrieve/58482/2012%20-%20Cintia%20Silva%20Nunes.pdf.jpgporUniversidade Federal Rural do Rio de JaneiroPrograma de P?s-Gradua??o em Ci?ncias Ambientais e FlorestaisUFRRJBrasilInstituto de FlorestasAHAJJI, A.; DIOUF, P. 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dc.title.por.fl_str_mv Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas
dc.title.alternative.eng.fl_str_mv Technological properties and adhesion quality of the heat-treated Corymbia citriodora and Eucalyptus pellita woods
title Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas
spellingShingle Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas
Nunes, Cintia Silva
shear strength
wood color
heat treatment
resist?ncia ao cisalhamento
cor da madeira
termorretifica??o
Recursos Florestais e Engenharia Florestal
title_short Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas
title_full Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas
title_fullStr Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas
title_full_unstemmed Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas
title_sort Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas
author Nunes, Cintia Silva
author_facet Nunes, Cintia Silva
author_role author
dc.contributor.advisor1.fl_str_mv Garcia, Rosilei Aparecida
dc.contributor.advisor1ID.fl_str_mv 252.216.258-65
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/7750485701838003
dc.contributor.advisor-co1.fl_str_mv Nascimento, Alexandre Miguel do
dc.contributor.advisor-co1ID.fl_str_mv 474.417.396-91
dc.contributor.advisor-co1Lattes.fl_str_mv http://lattes.cnpq.br/3579375199519821
dc.contributor.advisor-co2.fl_str_mv Lelis, Roberto Carlos Costa
dc.contributor.advisor-co2ID.fl_str_mv 328.792.886-49
dc.contributor.advisor-co2Lattes.fl_str_mv http://lattes.cnpq.br/5175502780570226
dc.contributor.referee1.fl_str_mv Vidaurre, Graziela Baptista
dc.contributor.referee2.fl_str_mv Carvalho, Alexandre Monteiro de
dc.contributor.authorID.fl_str_mv 116.797.837-42
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/2686808451602310
dc.contributor.author.fl_str_mv Nunes, Cintia Silva
contributor_str_mv Garcia, Rosilei Aparecida
Nascimento, Alexandre Miguel do
Lelis, Roberto Carlos Costa
Vidaurre, Graziela Baptista
Carvalho, Alexandre Monteiro de
dc.subject.eng.fl_str_mv shear strength
wood color
heat treatment
topic shear strength
wood color
heat treatment
resist?ncia ao cisalhamento
cor da madeira
termorretifica??o
Recursos Florestais e Engenharia Florestal
dc.subject.por.fl_str_mv resist?ncia ao cisalhamento
cor da madeira
termorretifica??o
dc.subject.cnpq.fl_str_mv Recursos Florestais e Engenharia Florestal
description Heat treatment provides desirable characteristics to the wood such as higher dimensional stability, higher natural durability and, in some cases, changes on original color. However, the treatment can also drastically alter the physical and chemical characteristics of wood surfaces, which affect the adhesion quality and coating application. In this context, the objectives of this study were: (1) to evaluate the effect of heat treatmens on physical properties (density, equilibrium moisture content and mass loss) of Corymbia citriodora (Hook.) K.D. Hill & L.A.S. Johnson and Eucalyptus pellita F. Muell. woods; (2) to determine the effect of heat treatment on color change of both woods; (3) to evaluate the effect of heat treatments on adhesion quality of glued joints by shear strength testing; and (4) to evaluate the effect of physical and chemical modifications following heat treatment on adhesion characteristics. Heat treatments were performed in a laboratorial electric oven at 180 and 200?C. Color measurements were carried out on the CIE-L*a*b* space by using the CM-2600d portable spectrophotometer. Shear strength tests of the glued joints and solid woods were performed according to ASTM D 905 and ASTM D 143 standards, respectively. Three adhesive types were used: resorcinol, resorcinol-tannin 80:20 and resorcinol-tannin 60:40. Density and equilibrium moisture content of both wood species were reduzed by heat treatment. Both woods had mass loss, which increased with the increase of temperature and was more pronounced for Eucalyptus pellita. The original color of the woods changed following heat treatment, mainly to Eucalyptus pellita. The shear strength of solid wood and glued joints of both species was severely affected by heat treatments. The resorcinol-tannin 80:20 adhesive showed the best performance for untreated woods, however, after heat treatment, the adhesive type did not affect the shear strength. Glued joints of heat-treated woods had high percentage of wood failure due to higher porosity and adhesive penetration. The acidity of heat-treated woods affected the shear strength and presented a strong correlation with equilibrium moisture content due to degradation of hemicelluloses. Heat treatments at 180 and 200oC are extremely severe to Corymbia citriodora and Eucalyptus pellita woods
publishDate 2012
dc.date.issued.fl_str_mv 2012-06-29
dc.date.accessioned.fl_str_mv 2017-04-27T11:59:34Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.citation.fl_str_mv NUNES, Cintia Silva. Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas. 2012. 56 f. Disserta??o (Mestrado em Ci?ncias Ambientais e Florestais) - Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, Serop?dica, 2012.
dc.identifier.uri.fl_str_mv https://tede.ufrrj.br/jspui/handle/jspui/1560
identifier_str_mv NUNES, Cintia Silva. Propriedades tecnol?gicas e qualidade de ades?o de madeiras de Corymbia citriodora e Eucalyptus pellita termorretificadas. 2012. 56 f. Disserta??o (Mestrado em Ci?ncias Ambientais e Florestais) - Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, Serop?dica, 2012.
url https://tede.ufrrj.br/jspui/handle/jspui/1560
dc.language.iso.fl_str_mv por
language por
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