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Registro Completo |
Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
23/08/2019 |
Data da última atualização: |
03/10/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
CADEMARTORI, P. H. G. de; ARTNER, M. A.; FREITAS, R. A. de; MAGALHAES, W. L. E. |
Afiliação: |
Pedro Henrique Gonzalez de Cademartori, UFPR; Mirela Angelita Artner, UFPR; Rilton Alves de Freitas, UFPR; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF. |
Título: |
Alumina nanoparticles as formaldehyde scavenger for urea-formaldehyde resin: rheological and in-situ cure performance. |
Ano de publicação: |
2019 |
Fonte/Imprenta: |
Composites Part B, v. 176, article 107281, Nov. 2019. 9 p. |
DOI: |
10.1016/j.compositesb.2019.107281 |
Idioma: |
Inglês |
Conteúdo: |
Formaldehyde emission in the environment from thermosetting resins, like urea-formaldehyde (UF), is one of the most negative aspects of wood-based composite panels. UF resins with low or zero formaldehyde emission and keeping or improving their remarkable properties have been designed by different approaches, with special attention to organic and inorganic nanofillers. Although formaldehyde emission can be mitigated, controlling of rheology kinetics, curing and thermal stability are essential to avoid restrictions for practical applications. Here, we investigated the incorporation of small percentages of Al2O3 nanoparticles into UF resin regarding its rheology, thermodynamic mechanics, thermal kinetics and morphology. Changes on formaldehyde emission was determined by desiccator method and qualitatively illustrated by thermogravimetry-mass spectrometry analysis. The Al2O3 incorporation without significant agglomerations changed the viscosity of UF resin, presenting a shear thinning behavior, especially for higher quantity of nanoparticles. Likewise, analysis of thermodynamic mechanisms shows Al2O3 as an effective additive for UF resin without changing important curing parameters like vitrification point and gel temperature. Al2O3 nanoparticles are also effective to reduce the formaldehyde emission during the UF resin cure reactions at high temperatures and up to 14% in MDF composite panels at environmental temperatures. |
Palavras-Chave: |
Alumina; Cure behavior; Formaldeído; Nanopartícula; Reologia; Thermosetting resin. |
Thesaurus Nal: |
Nanoparticles; Rheology. |
Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
Marc: |
LEADER 02262naa a2200265 a 4500 001 2111572 005 2019-10-03 008 2019 bl uuuu u00u1 u #d 024 7 $a10.1016/j.compositesb.2019.107281$2DOI 100 1 $aCADEMARTORI, P. H. G. de 245 $aAlumina nanoparticles as formaldehyde scavenger for urea-formaldehyde resin$brheological and in-situ cure performance.$h[electronic resource] 260 $c2019 520 $aFormaldehyde emission in the environment from thermosetting resins, like urea-formaldehyde (UF), is one of the most negative aspects of wood-based composite panels. UF resins with low or zero formaldehyde emission and keeping or improving their remarkable properties have been designed by different approaches, with special attention to organic and inorganic nanofillers. Although formaldehyde emission can be mitigated, controlling of rheology kinetics, curing and thermal stability are essential to avoid restrictions for practical applications. Here, we investigated the incorporation of small percentages of Al2O3 nanoparticles into UF resin regarding its rheology, thermodynamic mechanics, thermal kinetics and morphology. Changes on formaldehyde emission was determined by desiccator method and qualitatively illustrated by thermogravimetry-mass spectrometry analysis. The Al2O3 incorporation without significant agglomerations changed the viscosity of UF resin, presenting a shear thinning behavior, especially for higher quantity of nanoparticles. Likewise, analysis of thermodynamic mechanisms shows Al2O3 as an effective additive for UF resin without changing important curing parameters like vitrification point and gel temperature. Al2O3 nanoparticles are also effective to reduce the formaldehyde emission during the UF resin cure reactions at high temperatures and up to 14% in MDF composite panels at environmental temperatures. 650 $aNanoparticles 650 $aRheology 653 $aAlumina 653 $aCure behavior 653 $aFormaldeído 653 $aNanopartícula 653 $aReologia 653 $aThermosetting resin 700 1 $aARTNER, M. A. 700 1 $aFREITAS, R. A. de 700 1 $aMAGALHAES, W. L. E. 773 $tComposites Part B$gv. 176, article 107281, Nov. 2019. 9 p.
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Embrapa Florestas (CNPF) |
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Registro Completo
Biblioteca(s): |
Embrapa Arroz e Feijão; Embrapa Meio Ambiente. |
Data corrente: |
05/09/2006 |
Data da última atualização: |
16/10/2020 |
Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
Autoria: |
LEITE, L. F. C.; PESSOA, M. C. P. Y.; LIMA, M. A. de; MADARI, B. E. |
Afiliação: |
LUIZ FERNANDO CARVALHO LEITE, CPAMN; MARIA CONCEICAO PERES YOUNG PESSOA, CNPMA; MAGDA APARECIDA DE LIMA, CNPMA; BEATA EMOKE MADARI, CNPAF. |
Título: |
Computer simulations for the study of carbon and nitrogen dynamics and greenhouse gas emissions in agricultural production systems. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
In: BODDEY, R. M.; LIMA, M. A.; ALVES, B. J. R.; MACHADO, P. L. O. de A.; URQUIAGA, S. (Ed.). Carbon stocks and greenhouse gas emissions in Brazilian agriculture. Brasília, DF: Embrapa, 2014. Chapter 9. |
Idioma: |
Inglês |
Palavras-Chave: |
Emissão de gases. |
Thesagro: |
Agricultura; Carbono; Efeito Estufa; Modelo de Simulação; Nitrogênio; Programa de Computador. |
Thesaurus NAL: |
Computer simulation; Gas emissions; Greenhouse gas emissions; Greenhouse gases. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/216731/1/2014SP-Leite-Computer-13959.pdf
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Marc: |
LEADER 01024naa a2200277 a 4500 001 2011867 005 2020-10-16 008 2014 bl uuuu u00u1 u #d 100 1 $aLEITE, L. F. C. 245 $aComputer simulations for the study of carbon and nitrogen dynamics and greenhouse gas emissions in agricultural production systems.$h[electronic resource] 260 $c2014 650 $aComputer simulation 650 $aGas emissions 650 $aGreenhouse gas emissions 650 $aGreenhouse gases 650 $aAgricultura 650 $aCarbono 650 $aEfeito Estufa 650 $aModelo de Simulação 650 $aNitrogênio 650 $aPrograma de Computador 653 $aEmissão de gases 700 1 $aPESSOA, M. C. P. Y. 700 1 $aLIMA, M. A. de 700 1 $aMADARI, B. E. 773 $tIn: BODDEY, R. M.; LIMA, M. A.; ALVES, B. J. R.; MACHADO, P. L. O. de A.; URQUIAGA, S. (Ed.). Carbon stocks and greenhouse gas emissions in Brazilian agriculture. Brasília, DF: Embrapa, 2014. Chapter 9.
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