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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
26/08/2020 |
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Data da última atualização: |
16/08/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FARIA, D. L.; MESQUITA JUNIOR, L.; RESENDE, A. A.; LOPES, D. E.; MENDES, L. M.; MARTINS, M. A.; MARCONCINI, J. M.; GUIMARÃES JUNIOR, J. B. |
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Afiliação: |
MARIA ALICE MARTINS, CNPDIA; JOSE MANOEL MARCONCINI, CNPDIA. |
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Título: |
Physical and mechanical properties of polyurethane thermoset matrices reinforced with green coconut fibres. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Journal of Composite Materials, v. 54, n. 30, 2020. |
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Páginas: |
4841-4852 |
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DOI: |
10.1177/0021998320940023 |
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Idioma: |
Inglês |
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Conteúdo: |
Currently, the use of composites to replace parts made only with plastics has been gradually employed. The advantages of these composites are low cost, high availability of raw materials and good physical and mechanical properties. Thus, this work aimed at producing and characterizing composites produced with coconut fibre reinforced polyurethane matrices. The coconut fibres were studied as to their chemical constituents, aspect ratio, bulk density, pH, tensile properties, and surface SEM images. The composites were prepared using the hand lay-up process and four different concentrations of coconut fibre were evaluated: 30, 40, 50, and 60%. The composites were assessed as for water absorption after 20 days of immersion, bulk density, impact IZOD, tensile tests, and visualize the matrix-reinforcement interface using SEM. The electron micrographs showed a great deal of impurities on the surface of coconut fibres, such as greases, waxes, and gums, due to the high amount of extraction material (19.78%), which damages the adherence of the polymer onto the coconut fibre and, as observed, cause detachment between the reinforcement and the matrix. The tensile strength of the composites tended to increase as greater amounts of coconut fibres were added to the matrix. The averages were around 6.51 to 6.72 MPa for composites with 30 and 60% fibres, respectively. Therefore, coconut fibres can be considered as an alternative to synthetic fibres commonly used in composites, and they can be used at a ratio of 60% without prejudicing the properties of the composites, making them lighter and cheaper. MenosCurrently, the use of composites to replace parts made only with plastics has been gradually employed. The advantages of these composites are low cost, high availability of raw materials and good physical and mechanical properties. Thus, this work aimed at producing and characterizing composites produced with coconut fibre reinforced polyurethane matrices. The coconut fibres were studied as to their chemical constituents, aspect ratio, bulk density, pH, tensile properties, and surface SEM images. The composites were prepared using the hand lay-up process and four different concentrations of coconut fibre were evaluated: 30, 40, 50, and 60%. The composites were assessed as for water absorption after 20 days of immersion, bulk density, impact IZOD, tensile tests, and visualize the matrix-reinforcement interface using SEM. The electron micrographs showed a great deal of impurities on the surface of coconut fibres, such as greases, waxes, and gums, due to the high amount of extraction material (19.78%), which damages the adherence of the polymer onto the coconut fibre and, as observed, cause detachment between the reinforcement and the matrix. The tensile strength of the composites tended to increase as greater amounts of coconut fibres were added to the matrix. The averages were around 6.51 to 6.72 MPa for composites with 30 and 60% fibres, respectively. Therefore, coconut fibres can be considered as an alternative to synthetic fibres commonly used in composites, and they can b... Mostrar Tudo |
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Palavras-Chave: |
Thermoset matrices. |
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Categoria do assunto: |
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Marc: |
LEADER 02357naa a2200241 a 4500
001 2124574
005 2022-08-16
008 2020 bl uuuu u00u1 u #d
024 7 $a10.1177/0021998320940023$2DOI
100 1 $aFARIA, D. L.
245 $aPhysical and mechanical properties of polyurethane thermoset matrices reinforced with green coconut fibres.$h[electronic resource]
260 $c2020
300 $a4841-4852
520 $aCurrently, the use of composites to replace parts made only with plastics has been gradually employed. The advantages of these composites are low cost, high availability of raw materials and good physical and mechanical properties. Thus, this work aimed at producing and characterizing composites produced with coconut fibre reinforced polyurethane matrices. The coconut fibres were studied as to their chemical constituents, aspect ratio, bulk density, pH, tensile properties, and surface SEM images. The composites were prepared using the hand lay-up process and four different concentrations of coconut fibre were evaluated: 30, 40, 50, and 60%. The composites were assessed as for water absorption after 20 days of immersion, bulk density, impact IZOD, tensile tests, and visualize the matrix-reinforcement interface using SEM. The electron micrographs showed a great deal of impurities on the surface of coconut fibres, such as greases, waxes, and gums, due to the high amount of extraction material (19.78%), which damages the adherence of the polymer onto the coconut fibre and, as observed, cause detachment between the reinforcement and the matrix. The tensile strength of the composites tended to increase as greater amounts of coconut fibres were added to the matrix. The averages were around 6.51 to 6.72 MPa for composites with 30 and 60% fibres, respectively. Therefore, coconut fibres can be considered as an alternative to synthetic fibres commonly used in composites, and they can be used at a ratio of 60% without prejudicing the properties of the composites, making them lighter and cheaper.
653 $aThermoset matrices
700 1 $aMESQUITA JUNIOR, L.
700 1 $aRESENDE, A. A.
700 1 $aLOPES, D. E.
700 1 $aMENDES, L. M.
700 1 $aMARTINS, M. A.
700 1 $aMARCONCINI, J. M.
700 1 $aGUIMARÃES JUNIOR, J. B.
773 $tJournal of Composite Materials$gv. 54, n. 30, 2020.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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| Registros recuperados : 5 | |
| 1. |  | TAVARES, K. M.; CAMPOS, A.; LUCHESI, B. R.; RESENDE, A. A.; MARCONCINI, J. M. Influência da adição de carboximetilcelulose nas propriedades mecânicas e de hidrofobicidade em filmes de amido de mandioca. In: WORKSHOP DA REDE DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 9., 2017, São Carlos. Anais ... São Carlos: Embrapa Instrumentação, 2017. p. 295-298. Editores: Caue Ribeiro de Oliveira, Elaine Cristina Paris, Luiz Henrique Capparelli Mattoso, Marcelo Porto Bemquerer, Maria Alice Martins, Odílio Benedito Garrido de Assis.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
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| 2. | | RESENDE, A. A.; REIS, M. V. dos; TAVARES, K. M.; LORENÇO, M. S.; OLIVEIRA, J. E. de; MARCONCINI, J. M. Influência da concentração de alginato de sódio e do tempo de reticulação em microcápsulas de semente sintética de Miconia Ligustroides (DC). In: SIMPÓSIO NACIONAL DE INSTRUMENTAÇÃO AGROPECUÁRIA, 4., 2019, São Carlos, SP. Ciência, inovação e mercado: anais. São Carlos, SP: Embrapa Instrumentação, 2019. Editores: Paulino Ribeiro Villas-Boas, Maria Alice Martins, Débora Marcondes Bastos Pereira Milori, Ladislau Martin Neto. SIAGRO 2019. 446 - 450| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
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| 4. | | FARIA, D. L.; MESQUITA JUNIOR, L.; RESENDE, A. A.; LOPES, D. E.; MENDES, L. M.; MARTINS, M. A.; MARCONCINI, J. M.; GUIMARÃES JUNIOR, J. B. Physical and mechanical properties of polyurethane thermoset matrices reinforced with green coconut fibres. Journal of Composite Materials, v. 54, n. 30, 2020. 4841-4852| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Instrumentação. |
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| 5. | | CHAVES, M. S.; MARIA, A. N.; MATA, S. S. da; CARNEIRO, P. C. F.; RESENDE, A. A.; RIZZO, H.; C. NETO, J.; OLIVEIRA, J. C. V.; BICUDO, S. D.; AZEVEDO, H. C. Inseminação artificial transcervical em tempo fixo em ovinos utilizando sêmen refrigerado. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE TECNOLOGIA DE EMBRIOES, 27., 2013, Praia do Forte. Resumos... Praia do Forte, BA, 2013.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Tabuleiros Costeiros. |
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| Registros recuperados : 5 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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