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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
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Data corrente: |
07/04/2015 |
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Data da última atualização: |
07/04/2015 |
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Autoria: |
MORAES, E. de; OTERO, J.; LOPES, J. M.; COSTA, P. T. C. |
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Título: |
Efeitos das fontes e níveis de cálcio no desempenho de poedeiras. II - níveis de cálcio do calcário moído na produção e qualidade dos ovos. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 14., 1977, Recife. Anais... Recife: Sociedade Brasileira de Zootecnia, 1977. p. 145-146. |
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Idioma: |
Português |
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Thesagro: |
Avicultura. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/121935/1/p.-145-146.pdf
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Marc: |
LEADER 00613naa a2200157 a 4500
001 2012923
005 2015-04-07
008 1977 bl uuuu u00u1 u #d
100 1 $aMORAES, E. de
245 $aEfeitos das fontes e níveis de cálcio no desempenho de poedeiras. II - níveis de cálcio do calcário moído na produção e qualidade dos ovos.
260 $c1977
650 $aAvicultura
700 1 $aOTERO, J.
700 1 $aLOPES, J. M.
700 1 $aCOSTA, P. T. C.
773 $tIn: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 14., 1977, Recife. Anais... Recife: Sociedade Brasileira de Zootecnia, 1977. p. 145-146.
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Embrapa Amazônia Ocidental (CPAA) |
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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. |
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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Circulação/Nível: |
A - 2 |
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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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