Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto
Ano de defesa: | 2019 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , , , , |
Tipo de documento: | Tese |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal Rural do Rio de Janeiro
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Programa de Pós-Graduação: |
Programa de P?s-Gradua??o em Ci?ncias Ambientais e Florestais
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Departamento: |
Instituto de Florestas
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País: |
Brasil
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Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | https://tede.ufrrj.br/jspui/handle/jspui/5488 |
Resumo: | The general objective of this study was to evaluate the effects of aging and surface roughness on wettability, surface energy and adhesion of a water-borne varnish on eucalypt woods. The specific objectives were: (1) to evaluate the effect of aging time on color change and surface inactivation and its correlations; (2) to evaluate the effect of the aging time of the surface after machining on the performance of a water-borne varnish and its correlation with wettability; and (3) to evaluate the effect of machining process (sanding and planing) on 3D roughness, wettability, surface energy, and adhesion of a water-borne varnish on eucalyptus woods. To meet these objectives, the thesis was divided into three chapters. In the first chapter, color and contact angle measurements were performed for seven eucalypt species (Corymbia citriodora, Eucalyptus camaldulensis, Eucalyptus pellita, Eucalyptus robusta, Eucalyptus saligna, Eucalyptus urophylla and Eucalyptus grandis) on the fresh surface (freshly machined) and aged after 7, 14, 21 and 28 days. The colorimetric analyzes were performed in the CIE 1976 L*a*b* color space and contact angle determined by a DSA 100 drop shape analyzer in static mode. In the second chapter, Corymbia citriodora, Eucalyptus camaldulensis, and Eucalyptus pellita woods were studied. Contact angle analysis and adhesion tests of a water-borne varnish were performed on the fresh surface (freshly machined) and aged surfaces after 4, 8, 24 and 48 h of planing. In the third chapter, 3D roughness parameters, wettability, surface energy and varnish adhesion on the sanded and planed surfaces of Eucalyptus grandis and Eucalyptus robusta woods were evaluated. The roughness was evaluated by 3D method using a MicroMeasure CHR 150 optic white light roughness meter. The wettability and surface energy were determined by contact angle analysis performed with FT? D200 goniometer. The surface energy was calculated by the Lifshitz-van der Walls/ Lewis acid-base theory using three different liquids: distilled water, formamide, and diiodomethane. The adhesion of a water-borne varnish to the wood was determined by the tensile strength test (pull-off). The results of the first chapter permitted to classify woods into three density classes: very high, high, and low; and two color groups: yellowish and reddish. The storage of the eucalypt woods caused darkening (lower luminosity - L*) and increased chromaticity on the surface. The storage time increased the contact angle, resulting in surfaces more hydrophobic. The variables L*, a*, b* and C*ab had a greater impact on the wettability of the surface than the density. The results of the second chapter showed a decrease in surface wettability and loss of coating adhesion with increasing aging time. Loss of adhesion usually occurs shortly after 4 h of planning, however, a more important effect is observed after 48 h. Also, the results show that in some eucalypt species, loss of adhesion is faster than in others. No correlation was found between surface wettability and varnish adhesion on Eucalyptus camaldulensis and Eucalyptus pellita woods. However, in Corymbia citriodora wood, the tensile strength decreased with increasing mean contact angle, showing a significant correlation. The results of the third chapter showed that the planing increased the surface roughness showing higher values for the amplitude parameters (Sa, Sq, Sv, and Sz) than sanding. The sanded surfaces presented greater wettability and surface energy, however, this machining operation did not favor the penetration of the varnish. The planed surfaces of Eucalyptus grandis showed better adhesion of the coating than sanded surfaces. The rougher surfaces presented lower wettability and surface energy and higher adhesion of the coating, therefore, the roughness has a more important impact on the adhesion of the water-borne varnish to eucalypt woods than the wettability and surface energy properties. |
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Garcia, Rosilei AparecidaHern?ndez, Roger E.Garcia, Rosilei AparecidaLima, Jos? Tarc?sioDias, Ananias FranciscoNascimento, Alexandre Miguel doBrito, Edv? Oliveirahttp://lattes.cnpq.br/0433671044783750Santos, Wanessa Aparecida2022-03-28T18:09:22Z2019-02-26SANTOS, Wanessa Aparecida. Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto. 2019. 125 f. Tese (Doutorado em Ci?ncias Ambientais e Florestais) - Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, Serop?dica, 2019.https://tede.ufrrj.br/jspui/handle/jspui/5488The general objective of this study was to evaluate the effects of aging and surface roughness on wettability, surface energy and adhesion of a water-borne varnish on eucalypt woods. The specific objectives were: (1) to evaluate the effect of aging time on color change and surface inactivation and its correlations; (2) to evaluate the effect of the aging time of the surface after machining on the performance of a water-borne varnish and its correlation with wettability; and (3) to evaluate the effect of machining process (sanding and planing) on 3D roughness, wettability, surface energy, and adhesion of a water-borne varnish on eucalyptus woods. To meet these objectives, the thesis was divided into three chapters. In the first chapter, color and contact angle measurements were performed for seven eucalypt species (Corymbia citriodora, Eucalyptus camaldulensis, Eucalyptus pellita, Eucalyptus robusta, Eucalyptus saligna, Eucalyptus urophylla and Eucalyptus grandis) on the fresh surface (freshly machined) and aged after 7, 14, 21 and 28 days. The colorimetric analyzes were performed in the CIE 1976 L*a*b* color space and contact angle determined by a DSA 100 drop shape analyzer in static mode. In the second chapter, Corymbia citriodora, Eucalyptus camaldulensis, and Eucalyptus pellita woods were studied. Contact angle analysis and adhesion tests of a water-borne varnish were performed on the fresh surface (freshly machined) and aged surfaces after 4, 8, 24 and 48 h of planing. In the third chapter, 3D roughness parameters, wettability, surface energy and varnish adhesion on the sanded and planed surfaces of Eucalyptus grandis and Eucalyptus robusta woods were evaluated. The roughness was evaluated by 3D method using a MicroMeasure CHR 150 optic white light roughness meter. The wettability and surface energy were determined by contact angle analysis performed with FT? D200 goniometer. The surface energy was calculated by the Lifshitz-van der Walls/ Lewis acid-base theory using three different liquids: distilled water, formamide, and diiodomethane. The adhesion of a water-borne varnish to the wood was determined by the tensile strength test (pull-off). The results of the first chapter permitted to classify woods into three density classes: very high, high, and low; and two color groups: yellowish and reddish. The storage of the eucalypt woods caused darkening (lower luminosity - L*) and increased chromaticity on the surface. The storage time increased the contact angle, resulting in surfaces more hydrophobic. The variables L*, a*, b* and C*ab had a greater impact on the wettability of the surface than the density. The results of the second chapter showed a decrease in surface wettability and loss of coating adhesion with increasing aging time. Loss of adhesion usually occurs shortly after 4 h of planning, however, a more important effect is observed after 48 h. Also, the results show that in some eucalypt species, loss of adhesion is faster than in others. No correlation was found between surface wettability and varnish adhesion on Eucalyptus camaldulensis and Eucalyptus pellita woods. However, in Corymbia citriodora wood, the tensile strength decreased with increasing mean contact angle, showing a significant correlation. The results of the third chapter showed that the planing increased the surface roughness showing higher values for the amplitude parameters (Sa, Sq, Sv, and Sz) than sanding. The sanded surfaces presented greater wettability and surface energy, however, this machining operation did not favor the penetration of the varnish. The planed surfaces of Eucalyptus grandis showed better adhesion of the coating than sanded surfaces. The rougher surfaces presented lower wettability and surface energy and higher adhesion of the coating, therefore, the roughness has a more important impact on the adhesion of the water-borne varnish to eucalypt woods than the wettability and surface energy properties.O objetivo geral deste estudo foi avaliar o efeito do envelhecimento e da rugosidade superficial na molhabilidade, na energia superficial e na ader?ncia do verniz em madeiras de eucalipto. Os objetivos espec?ficos foram: (1) avaliar o efeito do tempo de envelhecimento na altera??o da cor e na inativa??o da superf?cie e suas correla??es; (2) avaliar o efeito do tempo de envelhecimento da superf?cie ap?s usinagem no desempenho do verniz e sua correla??o com a molhabilidade; e (3) avaliar o efeito das opera??es de usinagem (lixamento e aplainamento) na rugosidade 3D, na molhabilidade, na energia superficial e na ader?ncia do verniz em madeiras de eucalipto. Para atender esses objetivos, a tese foi dividida em tr?s cap?tulos. No primeiro cap?tulo, foram realizadas medi??es de cor e ?ngulo de contato para sete esp?cies de eucalipto (Corymbia citriodora, Eucalyptus camaldulensis, Eucalyptus pellita, Eucalyptus robusta, Eucalyptus saligna, Eucalyptus urophylla e Eucalyptus grandis) na superf?cie fresca (rec?musinada) e envelhecida ap?s 7, 14, 21 e 28 dias. As an?lises colorim?tricas foram realizadas no espa?o de cor L*a*b* CIE 1976 e o ?ngulo de contato determinado pelo analisador de formato da gota DSA 100 no modo est?tico. No segundo cap?tulo, foram estudadas as madeiras de Corymbia citriodora, Eucalyptus camaldulensis e Eucalyptus pellita. An?lises de ?ngulo de contato e testes de ades?o de um verniz ? base de ?gua foram realizados na superf?cie fresca (rec?m-usinada) e envelhecida ap?s 4, 8, 24 e 48 h de aplainamento. No terceiro cap?tulo, foram avaliados os par?metros de rugosidade 3D, a molhabilidade, a energia superficial e a ades?o do verniz nas superf?cies lixadas e aplainadas das madeiras de Eucalyptus robusta e Eucalyptus grandis. A rugosidade foi avaliada pelo m?todo 3D com o rugos?metro ?ptico de luz branca MicroMeasure CHR 150. O ?ngulo de contato e a energia superficial foram determinadas pelo goni?metro de imagem FT? D200. A energia superficial foi calculada pela teoria ?cido-base de Lifshitz-van der Waals/Lewis utilizando tr?s diferentes l?quidos: ?gua destilada, formamida e diiodometano. A ades?o do revestimento (verniz ? base de ?gua) na madeira foi determinada pelo teste de resist?ncia a tra??o (pull-off). Os resultados do primeiro cap?tulo permitiram classificar as madeiras em tr?s classes de densidade: muito alta, alta e baixa; e dois grupos de cor: amareladas e avermelhadas. O armazenamento das madeiras de eucalipto causou o escurecimento (menor luminosidade ? L*) e o aumento de cromaticidade na superf?cie. O tempo de acondicionamento aumentou o ?ngulo de contato indicando que as superf?cies tornaram-se mais hidrof?bicas. As vari?veis L*, a*, b* e C*ab tiveram maior impacto na molhabilidade da superf?cie que a densidade. Os resultados do segundo cap?tulo mostraram redu??o na molhabilidade da superf?cie e perda de ades?o com o aumento do tempo de envelhecimento. A perda de ades?o ocorreu, geralmente, logo ap?s as 4 h do aplainamento; entretanto, um efeito mais importante foi observado ap?s 48 h. Os resultados tamb?m mostram que em algumas esp?cies de eucalipto, a perda de ades?o ? mais r?pida que em outras. Nenhuma correla??o foi encontrada entre a molhabilidade da superf?cie e a ades?o do verniz nas madeiras de Eucalyptus camaldulensis e Eucalyptus pellita; entretanto, a resist?ncia ? tra??o da madeira de Corymbia citriodora diminuiu com o aumento do ?ngulo de contato m?dio, mostrando uma correla??o significativa. Os resultados do terceiro cap?tulo mostraram que o aplainamento aumentou a rugosidade superficial mostrando maiores valores para os par?metros de amplitude (Sa, Sq, Sv e Sz) que o lixamento. As superf?cies lixadas apresentaram maior molhabilidade e energia superficial, entretanto, esta opera??o de usinagem n?o favoreceu a penetra??o do verniz. As superf?cies aplainadas de Eucalyptus grandis apresentaram uma melhor ades?o do revestimento que as superf?cies lixadas. As superf?cies mais rugosas apresentaram menor molhabilidade, menor energia superficial e maior ades?o do revestimento, portanto, a rugosidade apresenta um impacto mais importante na ader?ncia do verniz ? base de ?gua que as propriedades de molhabilidade e energia superficial.Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2022-03-28T18:09:21Z No. of bitstreams: 1 2019 - Wanessa Aparecida Santos.pdf: 3965678 bytes, checksum: 5be3ae049c46595ca613d86b21397d9c (MD5)Made available in DSpace on 2022-03-28T18:09:22Z (GMT). No. of bitstreams: 1 2019 - Wanessa Aparecida Santos.pdf: 3965678 bytes, checksum: 5be3ae049c46595ca613d86b21397d9c (MD5) Previous issue date: 2019-02-26CAPES - Coordena??o de Aperfei?oamento de Pessoal de N?vel Superiorapplication/pdfhttps://tede.ufrrj.br/retrieve/68633/2019%20-%20Wanessa%20Aparecida%20Santos.pdf.jpgporUniversidade Federal Rural do Rio de JaneiroPrograma de P?s-Gradua??o em Ci?ncias Ambientais e FlorestaisUFRRJBrasilInstituto de FlorestasAGOSTINETTO, D.; TAROUCO, C. P.; MARKUS, C.; OLIVEIRA, E.; SILVA, J. M. B. V.; TIRONI, S. P. Seletividade de gen?tipos de eucalipto a doses de herbicidas. Semina: Ci?ncias Agr?rias, v. 31, n. 3, p. 585-598, 2011. ALBINO, V. C. S.; MORI, F. A.; MENDES, L. M. Estudo da interface madeira-adesivo de juntas coladas com resorcinol-formalde?do e madeira de Eucalyptus grandis W. Hill ex Maiden, Scientia Forestalis, v. 38, n. 87, p. 509-516, 2010. ALLEN, W. K. Theories of adhesion. In: PACKHAM, D. E. Handbook of Adhesion, 2 ed. 638p. 2005a. ALLEN, W. K. Mechanical theory of adhesion. In: PACKHAM, D. E. Handbook of Adhesion, 2 ed. 638p. 2005b. ALVES, M. C. de S.; GON?ALVES, M. T. T.; VARASQUIM, F. M. F. de A.; SANTIAGO, L. F. F.; VARANDA, L. D.; BIANCHI, E. C. An?lise da influ?ncia da velocidade de corte, da granulometria da lixa e da press?o espec?fica de corte no processo de lixamento. VI CONGRESSO NACIONAL DE ENGENHARIA MEC?NICA. Anais...Para?ba: 2010. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM). ASTM D 2395-93: Standard test methods for specific gravity of wood and wood-based materials. Philadelphia, 1999. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM). ASTM D 4541: Standard test method for pull-off strength of coatings using portable adhesion testers. Philadelphia, 2002. ASSOCIA??O BRASILEIRA DE NORMAS T?CNICAS (ABNT). NBR ISO 4287: Especifica??es geom?tricas dos produtos (GPS) ? rugosidade: m?todo do perfil ? termos, defini??es e par?metros da rugosidade. Rio de Janeiro, 2002. ASSOCIA??O PAULISTA DE PRODUTORES DE FLORESTAS PLANTANDASFLORESTAR, 2015. Dispon?vel em: http://www.floresta.org.br. Acessado em: 25 de maio de 2015. ATAYDE, C. M.; GON?ALEZ, J. C.; CAMARGOS, J. A. Caracter?sticas colorim?tricas entre as se??es anat?micas da madeira de Muirapiranga (Brosimum sp.). Cerne, v. 17, n. 2, p. 231-235, 2011. ATKINS, P. W. F?sico-Qu?mica. 7 ed. Rio de Janeiro, BRJ: Livros t?cnicos e cient?ficos, v.1, 2003. AUCLAIR, N. Stabilit? des couleurs des syst?mes bois/vernis am?lior?e par les rev?tements nanocomposites aqueux ? usage ext?rieur. M?moire de ma?trise en sciences du bois, D?partement des sciences du bois et de la for?t, Universit? Laval, Qu?bec (Qu?bec). 2010.?ngulo de contatoenergia livre da superf?cieespa?o de cor L*a*b* CIE 1976rugosidade 3Dteste de pull-offusinagemcontact anglefree surface energyCIE 1976 L*a*b* space color3D roughnesspull-off testmachiningRecursos Florestais e Engenharia FlorestalEfeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucaliptoEffects of aging and roughness on the surface properties and adhesion of a water-borne varnish on eucalypt woodsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da UFRRJinstname:Universidade Federal Rural do Rio de Janeiro (UFRRJ)instacron:UFRRJTHUMBNAIL2019 - Wanessa Aparecida Santos.pdf.jpg2019 - Wanessa Aparecida Santos.pdf.jpgimage/jpeg1943http://localhost:8080/tede/bitstream/jspui/5488/4/2019+-+Wanessa+Aparecida+Santos.pdf.jpgcc73c4c239a4c332d642ba1e7c7a9fb2MD54TEXT2019 - Wanessa Aparecida Santos.pdf.txt2019 - Wanessa Aparecida Santos.pdf.txttext/plain328045http://localhost:8080/tede/bitstream/jspui/5488/3/2019+-+Wanessa+Aparecida+Santos.pdf.txt29324b03d4c2faf56f8f428cc42166edMD53ORIGINAL2019 - Wanessa Aparecida Santos.pdf2019 - Wanessa Aparecida Santos.pdfapplication/pdf3965678http://localhost:8080/tede/bitstream/jspui/5488/2/2019+-+Wanessa+Aparecida+Santos.pdf5be3ae049c46595ca613d86b21397d9cMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-82089http://localhost:8080/tede/bitstream/jspui/5488/1/license.txt7b5ba3d2445355f386edab96125d42b7MD51jspui/54882023-01-18 15:00:38.163oai:localhost: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Biblioteca Digital de Teses e Dissertaçõeshttps://tede.ufrrj.br/PUBhttps://tede.ufrrj.br/oai/requestbibliot@ufrrj.br||bibliot@ufrrj.bropendoar:2023-01-18T17:00:38Biblioteca Digital de Teses e Dissertações da UFRRJ - Universidade Federal Rural do Rio de Janeiro (UFRRJ)false |
dc.title.por.fl_str_mv |
Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto |
dc.title.alternative.eng.fl_str_mv |
Effects of aging and roughness on the surface properties and adhesion of a water-borne varnish on eucalypt woods |
title |
Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto |
spellingShingle |
Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto Santos, Wanessa Aparecida ?ngulo de contato energia livre da superf?cie espa?o de cor L*a*b* CIE 1976 rugosidade 3D teste de pull-off usinagem contact angle free surface energy CIE 1976 L*a*b* space color 3D roughness pull-off test machining Recursos Florestais e Engenharia Florestal |
title_short |
Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto |
title_full |
Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto |
title_fullStr |
Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto |
title_full_unstemmed |
Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto |
title_sort |
Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto |
author |
Santos, Wanessa Aparecida |
author_facet |
Santos, Wanessa Aparecida |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Garcia, Rosilei Aparecida |
dc.contributor.advisor-co1.fl_str_mv |
Hern?ndez, Roger E. |
dc.contributor.referee1.fl_str_mv |
Garcia, Rosilei Aparecida |
dc.contributor.referee2.fl_str_mv |
Lima, Jos? Tarc?sio |
dc.contributor.referee3.fl_str_mv |
Dias, Ananias Francisco |
dc.contributor.referee4.fl_str_mv |
Nascimento, Alexandre Miguel do |
dc.contributor.referee5.fl_str_mv |
Brito, Edv? Oliveira |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/0433671044783750 |
dc.contributor.author.fl_str_mv |
Santos, Wanessa Aparecida |
contributor_str_mv |
Garcia, Rosilei Aparecida Hern?ndez, Roger E. Garcia, Rosilei Aparecida Lima, Jos? Tarc?sio Dias, Ananias Francisco Nascimento, Alexandre Miguel do Brito, Edv? Oliveira |
dc.subject.por.fl_str_mv |
?ngulo de contato energia livre da superf?cie espa?o de cor L*a*b* CIE 1976 rugosidade 3D teste de pull-off usinagem |
topic |
?ngulo de contato energia livre da superf?cie espa?o de cor L*a*b* CIE 1976 rugosidade 3D teste de pull-off usinagem contact angle free surface energy CIE 1976 L*a*b* space color 3D roughness pull-off test machining Recursos Florestais e Engenharia Florestal |
dc.subject.eng.fl_str_mv |
contact angle free surface energy CIE 1976 L*a*b* space color 3D roughness pull-off test machining |
dc.subject.cnpq.fl_str_mv |
Recursos Florestais e Engenharia Florestal |
description |
The general objective of this study was to evaluate the effects of aging and surface roughness on wettability, surface energy and adhesion of a water-borne varnish on eucalypt woods. The specific objectives were: (1) to evaluate the effect of aging time on color change and surface inactivation and its correlations; (2) to evaluate the effect of the aging time of the surface after machining on the performance of a water-borne varnish and its correlation with wettability; and (3) to evaluate the effect of machining process (sanding and planing) on 3D roughness, wettability, surface energy, and adhesion of a water-borne varnish on eucalyptus woods. To meet these objectives, the thesis was divided into three chapters. In the first chapter, color and contact angle measurements were performed for seven eucalypt species (Corymbia citriodora, Eucalyptus camaldulensis, Eucalyptus pellita, Eucalyptus robusta, Eucalyptus saligna, Eucalyptus urophylla and Eucalyptus grandis) on the fresh surface (freshly machined) and aged after 7, 14, 21 and 28 days. The colorimetric analyzes were performed in the CIE 1976 L*a*b* color space and contact angle determined by a DSA 100 drop shape analyzer in static mode. In the second chapter, Corymbia citriodora, Eucalyptus camaldulensis, and Eucalyptus pellita woods were studied. Contact angle analysis and adhesion tests of a water-borne varnish were performed on the fresh surface (freshly machined) and aged surfaces after 4, 8, 24 and 48 h of planing. In the third chapter, 3D roughness parameters, wettability, surface energy and varnish adhesion on the sanded and planed surfaces of Eucalyptus grandis and Eucalyptus robusta woods were evaluated. The roughness was evaluated by 3D method using a MicroMeasure CHR 150 optic white light roughness meter. The wettability and surface energy were determined by contact angle analysis performed with FT? D200 goniometer. The surface energy was calculated by the Lifshitz-van der Walls/ Lewis acid-base theory using three different liquids: distilled water, formamide, and diiodomethane. The adhesion of a water-borne varnish to the wood was determined by the tensile strength test (pull-off). The results of the first chapter permitted to classify woods into three density classes: very high, high, and low; and two color groups: yellowish and reddish. The storage of the eucalypt woods caused darkening (lower luminosity - L*) and increased chromaticity on the surface. The storage time increased the contact angle, resulting in surfaces more hydrophobic. The variables L*, a*, b* and C*ab had a greater impact on the wettability of the surface than the density. The results of the second chapter showed a decrease in surface wettability and loss of coating adhesion with increasing aging time. Loss of adhesion usually occurs shortly after 4 h of planning, however, a more important effect is observed after 48 h. Also, the results show that in some eucalypt species, loss of adhesion is faster than in others. No correlation was found between surface wettability and varnish adhesion on Eucalyptus camaldulensis and Eucalyptus pellita woods. However, in Corymbia citriodora wood, the tensile strength decreased with increasing mean contact angle, showing a significant correlation. The results of the third chapter showed that the planing increased the surface roughness showing higher values for the amplitude parameters (Sa, Sq, Sv, and Sz) than sanding. The sanded surfaces presented greater wettability and surface energy, however, this machining operation did not favor the penetration of the varnish. The planed surfaces of Eucalyptus grandis showed better adhesion of the coating than sanded surfaces. The rougher surfaces presented lower wettability and surface energy and higher adhesion of the coating, therefore, the roughness has a more important impact on the adhesion of the water-borne varnish to eucalypt woods than the wettability and surface energy properties. |
publishDate |
2019 |
dc.date.issued.fl_str_mv |
2019-02-26 |
dc.date.accessioned.fl_str_mv |
2022-03-28T18:09:22Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SANTOS, Wanessa Aparecida. Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto. 2019. 125 f. Tese (Doutorado em Ci?ncias Ambientais e Florestais) - Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, Serop?dica, 2019. |
dc.identifier.uri.fl_str_mv |
https://tede.ufrrj.br/jspui/handle/jspui/5488 |
identifier_str_mv |
SANTOS, Wanessa Aparecida. Efeito do envelhecimento e da rugosidade nas propriedades da superf?cie e na ader?ncia do verniz em madeiras de eucalipto. 2019. 125 f. Tese (Doutorado em Ci?ncias Ambientais e Florestais) - Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, Serop?dica, 2019. |
url |
https://tede.ufrrj.br/jspui/handle/jspui/5488 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.references.por.fl_str_mv |
AGOSTINETTO, D.; TAROUCO, C. P.; MARKUS, C.; OLIVEIRA, E.; SILVA, J. M. B. V.; TIRONI, S. P. Seletividade de gen?tipos de eucalipto a doses de herbicidas. Semina: Ci?ncias Agr?rias, v. 31, n. 3, p. 585-598, 2011. ALBINO, V. C. S.; MORI, F. A.; MENDES, L. M. Estudo da interface madeira-adesivo de juntas coladas com resorcinol-formalde?do e madeira de Eucalyptus grandis W. Hill ex Maiden, Scientia Forestalis, v. 38, n. 87, p. 509-516, 2010. ALLEN, W. K. Theories of adhesion. In: PACKHAM, D. E. Handbook of Adhesion, 2 ed. 638p. 2005a. ALLEN, W. K. Mechanical theory of adhesion. In: PACKHAM, D. E. Handbook of Adhesion, 2 ed. 638p. 2005b. ALVES, M. C. de S.; GON?ALVES, M. T. T.; VARASQUIM, F. M. F. de A.; SANTIAGO, L. F. F.; VARANDA, L. D.; BIANCHI, E. C. An?lise da influ?ncia da velocidade de corte, da granulometria da lixa e da press?o espec?fica de corte no processo de lixamento. VI CONGRESSO NACIONAL DE ENGENHARIA MEC?NICA. Anais...Para?ba: 2010. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM). ASTM D 2395-93: Standard test methods for specific gravity of wood and wood-based materials. Philadelphia, 1999. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM). ASTM D 4541: Standard test method for pull-off strength of coatings using portable adhesion testers. Philadelphia, 2002. ASSOCIA??O BRASILEIRA DE NORMAS T?CNICAS (ABNT). NBR ISO 4287: Especifica??es geom?tricas dos produtos (GPS) ? rugosidade: m?todo do perfil ? termos, defini??es e par?metros da rugosidade. Rio de Janeiro, 2002. ASSOCIA??O PAULISTA DE PRODUTORES DE FLORESTAS PLANTANDASFLORESTAR, 2015. Dispon?vel em: http://www.floresta.org.br. Acessado em: 25 de maio de 2015. ATAYDE, C. M.; GON?ALEZ, J. C.; CAMARGOS, J. A. Caracter?sticas colorim?tricas entre as se??es anat?micas da madeira de Muirapiranga (Brosimum sp.). Cerne, v. 17, n. 2, p. 231-235, 2011. ATKINS, P. W. F?sico-Qu?mica. 7 ed. Rio de Janeiro, BRJ: Livros t?cnicos e cient?ficos, v.1, 2003. AUCLAIR, N. Stabilit? des couleurs des syst?mes bois/vernis am?lior?e par les rev?tements nanocomposites aqueux ? usage ext?rieur. M?moire de ma?trise en sciences du bois, D?partement des sciences du bois et de la for?t, Universit? Laval, Qu?bec (Qu?bec). 2010. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal Rural do Rio de Janeiro |
dc.publisher.program.fl_str_mv |
Programa de P?s-Gradua??o em Ci?ncias Ambientais e Florestais |
dc.publisher.initials.fl_str_mv |
UFRRJ |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Instituto de Florestas |
publisher.none.fl_str_mv |
Universidade Federal Rural do Rio de Janeiro |
dc.source.none.fl_str_mv |
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UFRRJ |
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