Influência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidro
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/883 |
Resumo: | In short glass fiber (GF) reinforced polypropylene (PP) composites, despite of the chemically inert and non-polar nature of the matrix, the fiber-matrix interfacial integrity may be compromised in a hygrothermal active environment by the addition of maleic anhydride (MAH) molecules of the interfacial compatibilizer (PP-g-MAH). The use of organophilic nanoclay particles (O-MMT, Cloisite 20A) could contribute to minimize this hygrothermal deterioration, due to its moisture barrier properties. So, the main goal of this study was to analyze the influence of O-MMT on the long-term mechanical performance of PP/PP-g-MAH/GF composites under hygrothermal ageing. Several PP composite formulations with constant GF content (40wt%) and varying concentrations of nanoclay (0.5; 1; 2; and 5wt%) were compounded in a corotating twin-screw extruder. The degree of nanoclay particles intercalation/exfoliation was characterized by X-ray diffraction (WAXD) and SEM/TEM microscopy analysis. Short-term mechanical characterization was carried out through standard tensile and Izod impact tests on injection moulded specimen. From this results, certain specimen were subjected to hygrothermal ageing in hot water at 80 ºC for 240/480/720 hours and the evolution of the hygrothermal deterioration was monitored by tensile tests. The increasing O-MMT content in unaged PP/PP-g-MAH/40%GF composites had an unexpected negative influence on short-term mechanical properties. Mechanical damping data indicated higher Tan  values for the ternary composite (PP/PP-g-MAH/40%GF/2%O-MMT), in comparison to the binary composite (PP/PP-g-MAH/40%FV), demonstrating deleterious effect of O-MMT on the fiber-polymer interfacial adhesion. SEM microscopy analysis of cryofractured surfaces were decisive for visual elucidation of the erosive action of O-MMT particles on the GF sizing treatment. Consequently, the relative tensile strength (TS) of the hygrothermally aged composite, with respect to that of the unaged composite (TSenv./TSn-env.), indicated that the addition of nanoclay in the ternary composite contributed to a higher deterioration of the long-term mechanical performance of GF-reinforced PP composites. |
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Motezuki, Joice EricaSousa, José Alexandrino dehttp://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4780205U9http://lattes.cnpq.br/07638438402525413c1c288f-f916-44f2-8f3e-26aa935ff7942016-06-02T19:12:24Z2012-11-082016-06-02T19:12:24Z2010-05-21MOTEZUKI, Joice Erica. Influence of nanoclay on the hygrothermal ageing of polypropylene / maleated pp / glass fiber composites abstract. 2010. 204 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2010.https://repositorio.ufscar.br/handle/ufscar/883In short glass fiber (GF) reinforced polypropylene (PP) composites, despite of the chemically inert and non-polar nature of the matrix, the fiber-matrix interfacial integrity may be compromised in a hygrothermal active environment by the addition of maleic anhydride (MAH) molecules of the interfacial compatibilizer (PP-g-MAH). The use of organophilic nanoclay particles (O-MMT, Cloisite 20A) could contribute to minimize this hygrothermal deterioration, due to its moisture barrier properties. So, the main goal of this study was to analyze the influence of O-MMT on the long-term mechanical performance of PP/PP-g-MAH/GF composites under hygrothermal ageing. Several PP composite formulations with constant GF content (40wt%) and varying concentrations of nanoclay (0.5; 1; 2; and 5wt%) were compounded in a corotating twin-screw extruder. The degree of nanoclay particles intercalation/exfoliation was characterized by X-ray diffraction (WAXD) and SEM/TEM microscopy analysis. Short-term mechanical characterization was carried out through standard tensile and Izod impact tests on injection moulded specimen. From this results, certain specimen were subjected to hygrothermal ageing in hot water at 80 ºC for 240/480/720 hours and the evolution of the hygrothermal deterioration was monitored by tensile tests. The increasing O-MMT content in unaged PP/PP-g-MAH/40%GF composites had an unexpected negative influence on short-term mechanical properties. Mechanical damping data indicated higher Tan  values for the ternary composite (PP/PP-g-MAH/40%GF/2%O-MMT), in comparison to the binary composite (PP/PP-g-MAH/40%FV), demonstrating deleterious effect of O-MMT on the fiber-polymer interfacial adhesion. SEM microscopy analysis of cryofractured surfaces were decisive for visual elucidation of the erosive action of O-MMT particles on the GF sizing treatment. Consequently, the relative tensile strength (TS) of the hygrothermally aged composite, with respect to that of the unaged composite (TSenv./TSn-env.), indicated that the addition of nanoclay in the ternary composite contributed to a higher deterioration of the long-term mechanical performance of GF-reinforced PP composites.A durabilidade mecânica de compósitos poliméricos requer a preservação da integridade interfacial fibra-polímero contra a ação do ambiente agressivo. Em compósitos de polipropileno (PP) reforçado com fibra de vidro (FV) curta, apesar da natureza apolar da matriz, esta integridade poderá ser comprometida na presença de calor e umidade, devido à introdução de grupos polares de anidrido maleico do compatibilizante interfacial de PP maleado (PP-g-MAH), conduzindo ao desacoplamento interfacial e a rápida deterioração das propriedades mecânicas do compósito. A introdução de nanoargila organofílica de Montmorilonita (O-MMT, Cloisite 20A) poderá contribuir para redução desta deterioração termohidrolítica do compósito, em função das suas características de barreira à permeação de água. Portanto, é objetivo principal deste estudo avaliar a influência da introdução da nanoargila na durabilidade mecânica sob envelhecimento higrotérmico de compósitos de PP/PP-g-MAH/FV. Diversas formulações de compósitos de PP com teor constante de FV (40% em massa) e teores variados de nanoargila (0,5; 1; 2; e 5% em peso) e de PP-g-MAH foram preparados numa extrusora dupla-rosca corrotacional. O grau de intercalação/esfoliação da nanoargila em PP/PP-g-MAH foi avaliado por difração de raios-X (WAXD) e análise microestrutural por MEV e MET. Destes compósitos, algumas formulações de melhor desempenho mecânico foram submetidas ao envelhecimento higrotérmico em água deionizada a 80°C. A introdução de O-MMT nos compósitos de PP/PP-g-MAH/40%FV apresentou um efeito deletério inesperado nas propriedades mecânicas de curta duração em função do teor crescente de O-MMT. Dados de amortecimento mecânico (Tan ) indicaram o efeito deletério da O-MMT no grau de adesão interfacial no compósito ternário (PP/PP-g-MAH/40%FV/2%O-MMT), em relação ao compósito binário (PP/PP-g-MAH/40%FV). Análise de superfícies criofraturadas dos compósitos por MEV indica a ação abrasiva da O-MMT no recobrimento da FV. A resistência à tração sob envelhecimento higrotérmico, relativizada pela do material não envelhecido, indica que a presença da nanoargila contribuiu para um grau maior de deterioração destes compósitos de PP com reforço híbrido de FV/O-MMT.Financiadora de Estudos e Projetosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarBREngenharia de materiaisCompósitos poliméricosEnvelhecimento higrotérmicoPropriedades mecânicasCompatibilidade interfacialENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAInfluência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidroInfluence of nanoclay on the hygrothermal ageing of polypropylene / maleated pp / glass fiber composites abstractinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis-1-1bd92bc3e-74c8-433e-9e3f-2ed0a17a806binfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL4659.pdfapplication/pdf3782907https://repositorio.ufscar.br/bitstream/ufscar/883/1/4659.pdfe060d8da34ca505a42f2b053b8782c03MD51TEXT4659.pdf.txt4659.pdf.txtExtracted texttext/plain0https://repositorio.ufscar.br/bitstream/ufscar/883/2/4659.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52THUMBNAIL4659.pdf.jpg4659.pdf.jpgIM Thumbnailimage/jpeg6445https://repositorio.ufscar.br/bitstream/ufscar/883/3/4659.pdf.jpgc9c182e7aab9989ead421008335a32c9MD53ufscar/8832023-09-18 18:31:28.217oai:repositorio.ufscar.br:ufscar/883Repositório 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 |
Influência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidro |
dc.title.alternative.eng.fl_str_mv |
Influence of nanoclay on the hygrothermal ageing of polypropylene / maleated pp / glass fiber composites abstract |
title |
Influência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidro |
spellingShingle |
Influência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidro Motezuki, Joice Erica Engenharia de materiais Compósitos poliméricos Envelhecimento higrotérmico Propriedades mecânicas Compatibilidade interfacial ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Influência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidro |
title_full |
Influência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidro |
title_fullStr |
Influência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidro |
title_full_unstemmed |
Influência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidro |
title_sort |
Influência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidro |
author |
Motezuki, Joice Erica |
author_facet |
Motezuki, Joice Erica |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/0763843840252541 |
dc.contributor.author.fl_str_mv |
Motezuki, Joice Erica |
dc.contributor.advisor1.fl_str_mv |
Sousa, José Alexandrino de |
dc.contributor.advisor1Lattes.fl_str_mv |
http://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4780205U9 |
dc.contributor.authorID.fl_str_mv |
3c1c288f-f916-44f2-8f3e-26aa935ff794 |
contributor_str_mv |
Sousa, José Alexandrino de |
dc.subject.por.fl_str_mv |
Engenharia de materiais Compósitos poliméricos Envelhecimento higrotérmico Propriedades mecânicas Compatibilidade interfacial |
topic |
Engenharia de materiais Compósitos poliméricos Envelhecimento higrotérmico Propriedades mecânicas Compatibilidade interfacial ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
In short glass fiber (GF) reinforced polypropylene (PP) composites, despite of the chemically inert and non-polar nature of the matrix, the fiber-matrix interfacial integrity may be compromised in a hygrothermal active environment by the addition of maleic anhydride (MAH) molecules of the interfacial compatibilizer (PP-g-MAH). The use of organophilic nanoclay particles (O-MMT, Cloisite 20A) could contribute to minimize this hygrothermal deterioration, due to its moisture barrier properties. So, the main goal of this study was to analyze the influence of O-MMT on the long-term mechanical performance of PP/PP-g-MAH/GF composites under hygrothermal ageing. Several PP composite formulations with constant GF content (40wt%) and varying concentrations of nanoclay (0.5; 1; 2; and 5wt%) were compounded in a corotating twin-screw extruder. The degree of nanoclay particles intercalation/exfoliation was characterized by X-ray diffraction (WAXD) and SEM/TEM microscopy analysis. Short-term mechanical characterization was carried out through standard tensile and Izod impact tests on injection moulded specimen. From this results, certain specimen were subjected to hygrothermal ageing in hot water at 80 ºC for 240/480/720 hours and the evolution of the hygrothermal deterioration was monitored by tensile tests. The increasing O-MMT content in unaged PP/PP-g-MAH/40%GF composites had an unexpected negative influence on short-term mechanical properties. Mechanical damping data indicated higher Tan  values for the ternary composite (PP/PP-g-MAH/40%GF/2%O-MMT), in comparison to the binary composite (PP/PP-g-MAH/40%FV), demonstrating deleterious effect of O-MMT on the fiber-polymer interfacial adhesion. SEM microscopy analysis of cryofractured surfaces were decisive for visual elucidation of the erosive action of O-MMT particles on the GF sizing treatment. Consequently, the relative tensile strength (TS) of the hygrothermally aged composite, with respect to that of the unaged composite (TSenv./TSn-env.), indicated that the addition of nanoclay in the ternary composite contributed to a higher deterioration of the long-term mechanical performance of GF-reinforced PP composites. |
publishDate |
2010 |
dc.date.issued.fl_str_mv |
2010-05-21 |
dc.date.available.fl_str_mv |
2012-11-08 2016-06-02T19:12:24Z |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:12:24Z |
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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 |
MOTEZUKI, Joice Erica. Influence of nanoclay on the hygrothermal ageing of polypropylene / maleated pp / glass fiber composites abstract. 2010. 204 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2010. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/883 |
identifier_str_mv |
MOTEZUKI, Joice Erica. Influence of nanoclay on the hygrothermal ageing of polypropylene / maleated pp / glass fiber composites abstract. 2010. 204 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2010. |
url |
https://repositorio.ufscar.br/handle/ufscar/883 |
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Universidade Federal de São Carlos |
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Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
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Universidade Federal de São Carlos |
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