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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
29/04/2010 |
Data da última atualização: |
29/06/2017 |
Tipo da produção científica: |
Folder/Folheto/Cartilha |
Autoria: |
MELLO, F. D. A.; CARGNIN, A.; MULLER, J. A.; ALBRECHT, J. C.; LAVAGNINI, G. V.; PIERDONÁ, R.; MOURA, S. B. de. |
Afiliação: |
FERNANDO DAMINELLI ARAÚJO MELLO, estagiário CPAC; ADELIANO CARGNIN, CPAC; João Augusto Muller, estagiário CPAC; JULIO CESAR ALBRECHT, CPAC; Gabriel Vinícius Lavagnini, estagiário CPAC; Rafael Pierdoná, estagiário CPAC; Sérgio Bento de Moura, estagiário CPAC. |
Título: |
Desempenho inicial de procedências de pinhão manso em condições de cerrado. |
Ano de publicação: |
2009 |
Fonte/Imprenta: |
Planaltina, DF: Embrapa Cerrados, 2009. |
Descrição Física: |
1 folder. |
Idioma: |
Português |
Palavras-Chave: |
Grain production; Pinhão manso; Produção de grãos; Savanna. |
Thesagro: |
Cerrado; Jatropha Curcas; Seleção. |
Thesaurus Nal: |
biodiesel; varieties. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/78144/1/p2009-034.pdf
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Marc: |
LEADER 00774nam a2200289 a 4500 001 1748267 005 2017-06-29 008 2009 bl uuuu u0uu1 u #d 100 1 $aMELLO, F. D. A. 245 $aDesempenho inicial de procedências de pinhão manso em condições de cerrado. 260 $aPlanaltina, DF: Embrapa Cerrados$c2009 300 $c1 folder. 650 $abiodiesel 650 $avarieties 650 $aCerrado 650 $aJatropha Curcas 650 $aSeleção 653 $aGrain production 653 $aPinhão manso 653 $aProdução de grãos 653 $aSavanna 700 1 $aCARGNIN, A. 700 1 $aMULLER, J. A. 700 1 $aALBRECHT, J. C. 700 1 $aLAVAGNINI, G. V. 700 1 $aPIERDONÁ, R. 700 1 $aMOURA, S. B. de
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Embrapa Cerrados (CPAC) |
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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
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
26/08/2020 |
Data da última atualização: |
16/08/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 2 |
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. |
Afiliação: |
MARIA ALICE MARTINS, CNPDIA; JOSE MANOEL MARCONCINI, CNPDIA. |
Título: |
Physical and mechanical properties of polyurethane thermoset matrices reinforced with green coconut fibres. |
Ano de publicação: |
2020 |
Fonte/Imprenta: |
Journal of Composite Materials, v. 54, n. 30, 2020. |
Páginas: |
4841-4852 |
DOI: |
10.1177/0021998320940023 |
Idioma: |
Inglês |
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 |
Palavras-Chave: |
Thermoset matrices. |
Categoria do assunto: |
-- |
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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