Desenvolvimento de blendas poliméricas PVC/NBR através de processamento reativo e vulcanização dinâmica in situ
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/769 |
Resumo: | Dynamic vulcanization is a process of vulcanization of an elastomer during melt mixing with a thermoplastic which results in a material with better chemical and mechanical properties at high temperature. The PVC/NBR blends were obtained by reactive processing and in situ dynamic curing. The crosslinking of PVC/NBR blends was accomplished using sulphur (S)/tetramethylthiuram disulphide (TMTD) and mercaptobenzothiazyl disulphide (MBTS) curative system during the reactive processing. The blends of PVC/NBR at the ratio of 90/10; 80/20 and 70/30 wt% were melt mixed using an internal mixer at 160°C and rotor speed of 60rpm. The degrees of crosslinking of the blends obtained by the reactive process were analyzed through Fourier Transform InfraRed (FT-IR), swelling and degree of cure. Higher crosslink densities were obtained the systems with higher amount of elastomer. The mechanical properties evaluated by tensile properties, tear strength, hardness and compression set showed that the dynamic vulcanized blends have a better performance compared to the similar conventional ones. It was observed an increase of 92% in the tensile stress to the dynamic vulcanized blend PVC/NBR (70/30) with partitioning agent of PVC and an increase of 205% in the Young´s modulus to the dynamic vulcanized blend PVC/NBR (90/10) with partitioning agent of CaCO3. The morphology of the blends examined by scanning electron microscopy evidenced the crosslinking formation only in the elastomeric phase. The vulcanized rubber particles are responsible by the increase of stiffness and consequently displayed better mechanical properties. |
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Passador, Fabio RobertoPessan, Luiz Antoniohttp://lattes.cnpq.br/8276650236213537http://lattes.cnpq.br/0152213852695153fa8f3584-2caa-4515-9cae-cbbb375970e92016-06-02T19:11:50Z2008-08-292016-06-02T19:11:50Z2008-02-28PASSADOR, Fabio Roberto. Development of PVC/NBR blends by reactive processing and in situ dynamic vulcanization process. 2008. 206 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2008.https://repositorio.ufscar.br/handle/ufscar/769Dynamic vulcanization is a process of vulcanization of an elastomer during melt mixing with a thermoplastic which results in a material with better chemical and mechanical properties at high temperature. The PVC/NBR blends were obtained by reactive processing and in situ dynamic curing. The crosslinking of PVC/NBR blends was accomplished using sulphur (S)/tetramethylthiuram disulphide (TMTD) and mercaptobenzothiazyl disulphide (MBTS) curative system during the reactive processing. The blends of PVC/NBR at the ratio of 90/10; 80/20 and 70/30 wt% were melt mixed using an internal mixer at 160°C and rotor speed of 60rpm. The degrees of crosslinking of the blends obtained by the reactive process were analyzed through Fourier Transform InfraRed (FT-IR), swelling and degree of cure. Higher crosslink densities were obtained the systems with higher amount of elastomer. The mechanical properties evaluated by tensile properties, tear strength, hardness and compression set showed that the dynamic vulcanized blends have a better performance compared to the similar conventional ones. It was observed an increase of 92% in the tensile stress to the dynamic vulcanized blend PVC/NBR (70/30) with partitioning agent of PVC and an increase of 205% in the Young´s modulus to the dynamic vulcanized blend PVC/NBR (90/10) with partitioning agent of CaCO3. The morphology of the blends examined by scanning electron microscopy evidenced the crosslinking formation only in the elastomeric phase. The vulcanized rubber particles are responsible by the increase of stiffness and consequently displayed better mechanical properties.Vulcanização dinâmica é o processo de vulcanização de um elastômero durante a mistura no estado fundido com um termoplástico, que resulta em materiais com boa resistência química e mecânica em altas temperaturas. A obtenção de blendas PVC/NBR por processamento reativo e vulcanização dinâmica in situ foi realizada utilizando o sistema de cura a base de enxofre (S) e combinação dos aceleradores 2,2-ditiomercaptobenzotiazol (MBTS) e dissulfeto de tetrametiltiuram (TMTD), utilizando-se dois tipos de borracha nitrílica, com diferentes agentes de partição, que é utilizado para manter o elastômero particulado. As blendas PVC/NBR (90/10, 80/20 e 70/30 % em massa) foram processadas em um reômetro de torque Haake a 160°C, com rotação de 60rpm. Ensaios de FTIR, inchamento em solvente e determinação do grau de cura foram utilizados para quantificar a formação de ligações cruzadas nas blendas obtidas por processamento reativo, sendo obtida maior densidade de ligações cruzadas nos sistemas em que utilizaram maior quantidade de NBR. As propriedades mecânicas das blendas obtidas por processamento reativo foram avaliadas por ensaios de tração, rasgo, dureza e deformação permanente à compressão, sendo observado desempenho mecânico superior das blendas vulcanizadas comparadas às blendas convencionais, com aumento de 92% na tensão de ruptura para blenda vulcanizada com 30% em massa de NBR particulada com CaCO3, em relação à blenda convencional e aumento de 205% no módulo elástico de blendas vulcanizadas com 10% em massa de NBR particulada com PVC. A morfologia das blendas foi avaliada por microscopia eletrônica de varredura, que evidenciou a formação de ligações cruzadas apenas no interior da fase elastomérica, sendo responsável pelo aumento da rigidez e desempenho mecânico superior.Financiadora de Estudos e Projetosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarBRVulcanização dinâmicaBlendas poliméricasProcessamento reativoPVCNBRENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICADesenvolvimento de blendas poliméricas PVC/NBR através de processamento reativo e vulcanização dinâmica in situDevelopment of PVC/NBR blends by reactive processing and in situ dynamic vulcanization processinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis-1-127e170ed-63e5-4ae6-96cf-f7ccb26a3076info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL1971.pdfapplication/pdf1916099https://repositorio.ufscar.br/bitstream/ufscar/769/1/1971.pdfb1ac78cc29503b58427116dd446887d8MD51TEXT1971.pdf.txt1971.pdf.txtExtracted texttext/plain0https://repositorio.ufscar.br/bitstream/ufscar/769/2/1971.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52THUMBNAIL1971.pdf.jpg1971.pdf.jpgIM Thumbnailimage/jpeg6239https://repositorio.ufscar.br/bitstream/ufscar/769/3/1971.pdf.jpgb534d19be1b24470481d99485a0fc6deMD53ufscar/7692023-09-18 18:31:28.056oai:repositorio.ufscar.br:ufscar/769Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:28Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Desenvolvimento de blendas poliméricas PVC/NBR através de processamento reativo e vulcanização dinâmica in situ |
dc.title.alternative.eng.fl_str_mv |
Development of PVC/NBR blends by reactive processing and in situ dynamic vulcanization process |
title |
Desenvolvimento de blendas poliméricas PVC/NBR através de processamento reativo e vulcanização dinâmica in situ |
spellingShingle |
Desenvolvimento de blendas poliméricas PVC/NBR através de processamento reativo e vulcanização dinâmica in situ Passador, Fabio Roberto Vulcanização dinâmica Blendas poliméricas Processamento reativo PVC NBR ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Desenvolvimento de blendas poliméricas PVC/NBR através de processamento reativo e vulcanização dinâmica in situ |
title_full |
Desenvolvimento de blendas poliméricas PVC/NBR através de processamento reativo e vulcanização dinâmica in situ |
title_fullStr |
Desenvolvimento de blendas poliméricas PVC/NBR através de processamento reativo e vulcanização dinâmica in situ |
title_full_unstemmed |
Desenvolvimento de blendas poliméricas PVC/NBR através de processamento reativo e vulcanização dinâmica in situ |
title_sort |
Desenvolvimento de blendas poliméricas PVC/NBR através de processamento reativo e vulcanização dinâmica in situ |
author |
Passador, Fabio Roberto |
author_facet |
Passador, Fabio Roberto |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/0152213852695153 |
dc.contributor.author.fl_str_mv |
Passador, Fabio Roberto |
dc.contributor.advisor1.fl_str_mv |
Pessan, Luiz Antonio |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/8276650236213537 |
dc.contributor.authorID.fl_str_mv |
fa8f3584-2caa-4515-9cae-cbbb375970e9 |
contributor_str_mv |
Pessan, Luiz Antonio |
dc.subject.por.fl_str_mv |
Vulcanização dinâmica Blendas poliméricas Processamento reativo PVC NBR |
topic |
Vulcanização dinâmica Blendas poliméricas Processamento reativo PVC NBR ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
Dynamic vulcanization is a process of vulcanization of an elastomer during melt mixing with a thermoplastic which results in a material with better chemical and mechanical properties at high temperature. The PVC/NBR blends were obtained by reactive processing and in situ dynamic curing. The crosslinking of PVC/NBR blends was accomplished using sulphur (S)/tetramethylthiuram disulphide (TMTD) and mercaptobenzothiazyl disulphide (MBTS) curative system during the reactive processing. The blends of PVC/NBR at the ratio of 90/10; 80/20 and 70/30 wt% were melt mixed using an internal mixer at 160°C and rotor speed of 60rpm. The degrees of crosslinking of the blends obtained by the reactive process were analyzed through Fourier Transform InfraRed (FT-IR), swelling and degree of cure. Higher crosslink densities were obtained the systems with higher amount of elastomer. The mechanical properties evaluated by tensile properties, tear strength, hardness and compression set showed that the dynamic vulcanized blends have a better performance compared to the similar conventional ones. It was observed an increase of 92% in the tensile stress to the dynamic vulcanized blend PVC/NBR (70/30) with partitioning agent of PVC and an increase of 205% in the Young´s modulus to the dynamic vulcanized blend PVC/NBR (90/10) with partitioning agent of CaCO3. The morphology of the blends examined by scanning electron microscopy evidenced the crosslinking formation only in the elastomeric phase. The vulcanized rubber particles are responsible by the increase of stiffness and consequently displayed better mechanical properties. |
publishDate |
2008 |
dc.date.available.fl_str_mv |
2008-08-29 2016-06-02T19:11:50Z |
dc.date.issued.fl_str_mv |
2008-02-28 |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:11:50Z |
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 |
PASSADOR, Fabio Roberto. Development of PVC/NBR blends by reactive processing and in situ dynamic vulcanization process. 2008. 206 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2008. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/769 |
identifier_str_mv |
PASSADOR, Fabio Roberto. Development of PVC/NBR blends by reactive processing and in situ dynamic vulcanization process. 2008. 206 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2008. |
url |
https://repositorio.ufscar.br/handle/ufscar/769 |
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por |
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por |
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27e170ed-63e5-4ae6-96cf-f7ccb26a3076 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de São Carlos |
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Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
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UFSCar |
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BR |
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Universidade Federal de São Carlos |
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