Avaliação de sistemas compatibilizantes nas correlações entre processamento e propriedades térmicas, mecânicas e de transporte em nanocompósitos de blenda HDPE/LLDPE e OMMT
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/694 |
Resumo: | Polyolefin nanocomposites have attracted significant technological and scientific interest due to the possibilities of improvements in thermal, mechanical and barrier properties. However, the hydrophobic nature of polyolefins poses a challenge to the exfoliation and dispersion process of the nanoclay in the polymeric matrix, requiring usually the use of compatibilizing agents. In this work, it was studied the influence of the blending protocol of the components and the effects of the addition of three compatibilizing systems (HDPE-g-MA, LLDPE-g-MA and mixture of HDPE-g-MA and LLDPE-g-MA) in HDPE /LLDPE blend-based nanocomposites. HDPE-g-MA has a higher viscosity and play a important role in the breaking and dispersion of the clay tactoids. The LLDPE-g- MA, with lower viscosity, helped in the intercalation process of the polymer chains between the nanoclay s lamellae and the mixing of the compatibilizing agents optimized the breakdown and intercalation process, and dispersion of the organophilic clay in the polymeric matrix. HDPE/LLDPE/OMMT nanocomposites with predominantly intercalated structure were obtained using different compatibilizing systems and concentrations of nanoclay. The thermal, mechanical and transport properties were strongly affected by the different compatibilizing systems. The mixture of compatibilizing agents (HDPE-g-MA and LLDPE-g-MA) produced a stronger interface between the dispersed phase and the polymeric matrix contributing to the increase in rigidity, elastic and flexural moduli of the nanocomposites. The transport properties showed that the nanocomposites behave as good barrier to water vapor and but showed low barrier characteristics to CO2 and O2. The decrease of the permeability coefficient is related to the use of compatibilizer systems which provided a good dispersion of the inorganic filler, good wettability of the matrix and strong interactions with the interface which could facilitate the diffusion process. |
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Passador, Fabio RobertoPessan, Luiz Antoniohttp://lattes.cnpq.br/8276650236213537http://lattes.cnpq.br/01522138526951532016-06-02T19:10:10Z2012-09-062016-06-02T19:10:10Z2012-04-11PASSADOR, Fabio Roberto. Evaluation of compatibilizing systems on the correlations between processing and thermal, mechanical and transport properties of hdpe/lldpe blend-based nanocomposites. 2012. 313 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2012.https://repositorio.ufscar.br/handle/ufscar/694Polyolefin nanocomposites have attracted significant technological and scientific interest due to the possibilities of improvements in thermal, mechanical and barrier properties. However, the hydrophobic nature of polyolefins poses a challenge to the exfoliation and dispersion process of the nanoclay in the polymeric matrix, requiring usually the use of compatibilizing agents. In this work, it was studied the influence of the blending protocol of the components and the effects of the addition of three compatibilizing systems (HDPE-g-MA, LLDPE-g-MA and mixture of HDPE-g-MA and LLDPE-g-MA) in HDPE /LLDPE blend-based nanocomposites. HDPE-g-MA has a higher viscosity and play a important role in the breaking and dispersion of the clay tactoids. The LLDPE-g- MA, with lower viscosity, helped in the intercalation process of the polymer chains between the nanoclay s lamellae and the mixing of the compatibilizing agents optimized the breakdown and intercalation process, and dispersion of the organophilic clay in the polymeric matrix. HDPE/LLDPE/OMMT nanocomposites with predominantly intercalated structure were obtained using different compatibilizing systems and concentrations of nanoclay. The thermal, mechanical and transport properties were strongly affected by the different compatibilizing systems. The mixture of compatibilizing agents (HDPE-g-MA and LLDPE-g-MA) produced a stronger interface between the dispersed phase and the polymeric matrix contributing to the increase in rigidity, elastic and flexural moduli of the nanocomposites. The transport properties showed that the nanocomposites behave as good barrier to water vapor and but showed low barrier characteristics to CO2 and O2. The decrease of the permeability coefficient is related to the use of compatibilizer systems which provided a good dispersion of the inorganic filler, good wettability of the matrix and strong interactions with the interface which could facilitate the diffusion process.A obtenção de nanocompósitos de matriz poliolefínica vem despertando grande interesse tecnológico e científico devido a possibilidade de incrementos significativos nas propriedades térmicas, mecânicas e de barreira dessa matriz. Entretanto, a natureza hidrofóbica das poliolefinas dificulta a dispersão e esfoliação das lamelas de nanoargila na matriz polimérica, sendo necessária a utilização de agente compatibilizante. Neste trabalho, estudou-se a influência da ordem de mistura dos componentes e da adição de três sistemas compatibilizantes (HDPE-g-MA, LLDPE-g-MA e mistura HDPE-g-MA/LLDPE-g- MA) em nanocompósitos de blendas HDPE/LLDPE e OMMT. O HDPE-g-MA, por possuir maior viscosidade auxiliou na quebra e dispersão dos tactóides de argila, o LLDPE-g-MA, com menor viscosidade, auxiliou no processo de intercalação das cadeias poliméricas entre as camadas da argila e a mistura dos agentes compatibilizantes otimizaram o processo de quebra, intercalação e dispersão de argila organofílica na matriz polimérica. Nanocompósitos de HDPE/LLDPE/OMMT com estrutura predominantemente intercalada foram obtidos utilizando-se os diferentes sistemas compatibilizantes e teores de nanoargila. O comportamento térmico, mecânico e as propriedades de transporte foram fortemente afetados pelos diferentes sistemas compatibilizantes. A mistura de agentes compatibilizantes (HDPE-g-MA e LLDPE-g-MA) propiciou melhor interação na interface entre a fase dispersa e a matriz polimérica contribuindo para o aumento da rigidez, módulo elástico e módulo de flexão dos nanocompósitos. O estudo das propriedades de transporte revelou que os nanocompósitos comportam-se como barreira ao vapor de água e baixa barreira ao CO2 e O2. A diminuição do coeficiente de permeabilidade está relacionada a utilização dos sistemas compatibilizantes que proporcionaram uma boa dispersão da carga inorgânica, boa molhabilidade desta pela matriz e forte interações na interface que diminuíram o número de microvazios, que poderiam ser facilitadores do processo difusional.Financiadora de Estudos e Projetosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarBRNanocompósitosBlendas poliméricasPropriedades de transportePermeabilidadeENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAAvaliação de sistemas compatibilizantes nas correlações entre processamento e propriedades térmicas, mecânicas e de transporte em nanocompósitos de blenda HDPE/LLDPE e OMMTEvaluation of compatibilizing systems on the correlations between processing and thermal, mechanical and transport properties of hdpe/lldpe blend-based nanocompositesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL4468.pdfapplication/pdf11546210https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/694/1/4468.pdf230fdc91c4d3e97e1f00ec01daa0179aMD51TEXT4468.pdf.txt4468.pdf.txtExtracted texttext/plain0https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/694/2/4468.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52THUMBNAIL4468.pdf.jpg4468.pdf.jpgIM Thumbnailimage/jpeg6979https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/694/3/4468.pdf.jpga5cbcd9653e6a194f880c3c3e59f9d54MD53ufscar/6942019-09-11 04:04:15.46oai:repositorio.ufscar.br:ufscar/694Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222019-09-11T04:04:15Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Avaliação de sistemas compatibilizantes nas correlações entre processamento e propriedades térmicas, mecânicas e de transporte em nanocompósitos de blenda HDPE/LLDPE e OMMT |
dc.title.alternative.eng.fl_str_mv |
Evaluation of compatibilizing systems on the correlations between processing and thermal, mechanical and transport properties of hdpe/lldpe blend-based nanocomposites |
title |
Avaliação de sistemas compatibilizantes nas correlações entre processamento e propriedades térmicas, mecânicas e de transporte em nanocompósitos de blenda HDPE/LLDPE e OMMT |
spellingShingle |
Avaliação de sistemas compatibilizantes nas correlações entre processamento e propriedades térmicas, mecânicas e de transporte em nanocompósitos de blenda HDPE/LLDPE e OMMT Passador, Fabio Roberto Nanocompósitos Blendas poliméricas Propriedades de transporte Permeabilidade ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Avaliação de sistemas compatibilizantes nas correlações entre processamento e propriedades térmicas, mecânicas e de transporte em nanocompósitos de blenda HDPE/LLDPE e OMMT |
title_full |
Avaliação de sistemas compatibilizantes nas correlações entre processamento e propriedades térmicas, mecânicas e de transporte em nanocompósitos de blenda HDPE/LLDPE e OMMT |
title_fullStr |
Avaliação de sistemas compatibilizantes nas correlações entre processamento e propriedades térmicas, mecânicas e de transporte em nanocompósitos de blenda HDPE/LLDPE e OMMT |
title_full_unstemmed |
Avaliação de sistemas compatibilizantes nas correlações entre processamento e propriedades térmicas, mecânicas e de transporte em nanocompósitos de blenda HDPE/LLDPE e OMMT |
title_sort |
Avaliação de sistemas compatibilizantes nas correlações entre processamento e propriedades térmicas, mecânicas e de transporte em nanocompósitos de blenda HDPE/LLDPE e OMMT |
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 |
contributor_str_mv |
Pessan, Luiz Antonio |
dc.subject.por.fl_str_mv |
Nanocompósitos Blendas poliméricas Propriedades de transporte Permeabilidade |
topic |
Nanocompósitos Blendas poliméricas Propriedades de transporte Permeabilidade ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
Polyolefin nanocomposites have attracted significant technological and scientific interest due to the possibilities of improvements in thermal, mechanical and barrier properties. However, the hydrophobic nature of polyolefins poses a challenge to the exfoliation and dispersion process of the nanoclay in the polymeric matrix, requiring usually the use of compatibilizing agents. In this work, it was studied the influence of the blending protocol of the components and the effects of the addition of three compatibilizing systems (HDPE-g-MA, LLDPE-g-MA and mixture of HDPE-g-MA and LLDPE-g-MA) in HDPE /LLDPE blend-based nanocomposites. HDPE-g-MA has a higher viscosity and play a important role in the breaking and dispersion of the clay tactoids. The LLDPE-g- MA, with lower viscosity, helped in the intercalation process of the polymer chains between the nanoclay s lamellae and the mixing of the compatibilizing agents optimized the breakdown and intercalation process, and dispersion of the organophilic clay in the polymeric matrix. HDPE/LLDPE/OMMT nanocomposites with predominantly intercalated structure were obtained using different compatibilizing systems and concentrations of nanoclay. The thermal, mechanical and transport properties were strongly affected by the different compatibilizing systems. The mixture of compatibilizing agents (HDPE-g-MA and LLDPE-g-MA) produced a stronger interface between the dispersed phase and the polymeric matrix contributing to the increase in rigidity, elastic and flexural moduli of the nanocomposites. The transport properties showed that the nanocomposites behave as good barrier to water vapor and but showed low barrier characteristics to CO2 and O2. The decrease of the permeability coefficient is related to the use of compatibilizer systems which provided a good dispersion of the inorganic filler, good wettability of the matrix and strong interactions with the interface which could facilitate the diffusion process. |
publishDate |
2012 |
dc.date.available.fl_str_mv |
2012-09-06 2016-06-02T19:10:10Z |
dc.date.issued.fl_str_mv |
2012-04-11 |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:10:10Z |
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 |
PASSADOR, Fabio Roberto. Evaluation of compatibilizing systems on the correlations between processing and thermal, mechanical and transport properties of hdpe/lldpe blend-based nanocomposites. 2012. 313 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2012. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/694 |
identifier_str_mv |
PASSADOR, Fabio Roberto. Evaluation of compatibilizing systems on the correlations between processing and thermal, mechanical and transport properties of hdpe/lldpe blend-based nanocomposites. 2012. 313 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2012. |
url |
https://repositorio.ufscar.br/handle/ufscar/694 |
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por |
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por |
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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 |
dc.publisher.program.fl_str_mv |
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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