| |
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
|
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.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Florestas (CNPF) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 76 | |
| 9. |  | NASCIMENTO, W. M.; FREITAS, R. A. de. Produção de semente. In: HENZ, G. P.; ALCÂNTARA, F. A. de; RESENDE, F. V. (Ed).Produção orgânica de hortaliças: o produtor pergunta, a Embrapa responde. Brasília, DF: Embrapa Informações Técnologicas, 2007. p. 263-274. (Coleção 500 perguntas, 500 respostas).| Tipo: Capítulo em Livro Técnico-Científico | Circulação/Nível: -- - -- |
| Biblioteca(s): Embrapa Hortaliças. |
|   |
| 13. | | SILVA, R. P.; FREITAS, R. A. de; NASCIMENTO, W. M. Condicionamento osmótico de sementes de pimenta e germinação sob diferentes temperaturas. Horticultura Brasileira, Brasília, DF, v. 27, n. 2, p. S1578-S1582, ago. 2009. CD-ROM. Suplemento. Trabalho apresentado no 49. Congresso Brasileiro de Olericultura, Águas de Lindóia, SP.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Hortaliças. |
| |
| 17. | | SILVA, P. P.; FREITAS, R. A. de; NASCIMENTO, W. M. Avaliação da qualidade fisiológica de sementes de tomate para indústria utilizando diferentes testes de vigor. CONGRESSO BRASILEIRO DE TOMATE INDUSTRIAL, 3.; SEMINÁRIO NACIONAL DE TOMATE DE MESA, 1., 2009, Goiânia. Tendências mundiais do processamento de tomate: anais... Brasília, DF: Embrapa Hortaliças: Associação Brasileira de Horticultura; Goiânia; FAEG: UFG: Secretaria de Agricultura, Pecuária e Abastecimento: Win Central de Eventos, 2009. CD ROM| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Hortaliças. |
| |
| Registros recuperados : 76 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
