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| 2. |  | ARAÚJO, M. L. de; ABREU, M. G. P. de; MELHORANÇA FILHO, A. L.; BATISTA, J. F. Verificação da quantidade de óleo presente em sementes de açai (Euterpe oleraceae Mart.). In: CONGRESSO BRASILEIRO DE MAMONA, 5.; SIMPÓSIO INTERNACIONAL DE OLEAGINOSAS ENERGÉTICAS, 2.; FÓRUM CAPIXABA DE PINHÃO-MANSO, 1., 2012, Guarapari. Desafios e Oportunidades: anais. Campina Grande: Embrapa Algodão, 2012. p. 13| Biblioteca(s): Embrapa Algodão. |
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| 4. | | ARAÚJO, J. M.; ANDRADE NETO, R. de C.; ALMEIDA, U. O. de; SEBIM, J. P. M.; ABREU, M. G. P. de; COSTA, D. A. da. Production of açaí seedlings under different shade levels and controlled release fertilizer. Revista de Agricultura Neotropical, v. 10, n. 3, e7325, July/Sept. 2023.| Biblioteca(s): Embrapa Acre. |
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Registro Completo
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
18/11/2014 |
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Data da última atualização: |
18/11/2014 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
MATTOS, B.; LAZZAROTTO, M.; MAGALHAES, W. L. E.; GATTO, D. A. |
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Afiliação: |
Bruno Dufau Mattos, PIPE, UFPR; MARCELO LAZZAROTTO, CNPF; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; Darci Alberto Gatto, Universidade Federal de Pelotas. |
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Título: |
Thermal tools to evaluation of decayed and weathered wood polymer composites prepared by in situ polymerization. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE ANÁLISE TÉRMICA E CALORIMETRIA, 9., 2014, Serra Negra. Trabalhos. [S.l.]: ABRATEC, 2014. |
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Páginas: |
6 p. |
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Descrição Física: |
Disponibilizado online. |
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Idioma: |
Inglês |
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Notas: |
CBRATEC. |
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Conteúdo: |
This study aims to apply thermal tools in the evaluation of decayed and weathered wood polymer composites prepared by in situ polymerization of methyl methacrylate (MMA) using glycidyl methacrylate (GMA) and methacrylic acid (MAA) as cross-linkers. The pine wood samples were impregnated in a vacuum/pressure system and polymerized in an oven at 90°C for 10h, using benzoyl peroxide at 1.5 wt% as catalyst. The untreated wood and composites were exposed to in vitro decay tests with Trametes versicolor and Gloeophyllum trabeum fungi, and to artificial weathering. The weight loss after tests was measured, and the characterization was performed by thermogravimetric (TGA) and differential scanning calorimetry (DSC) analysis. The mass loss caused by exposure to fungi was evidently higher in untreated wood in relation to the composites, ~2.5 to 10 times - the composites with GMA and MAA showed the highest resistance to both fungi. The composites without cross-linkers showed the higher mass loss in the artificial weathering tests (>11%), due to the leaching of part of poly(MMA) formed inside wood. By TGA and DSC analysis, we observed shifting in the temperature of thermal events related to polysaccharides and lignin after exposed to decays tests ? more significant changes were for Trametes versicolor tests. The thermograms related to weathered samples showed different results for each composite. The untreated wood and the composite without cross-linker presented loss in lignin, meanwhile the composites with cross-linkers presented degradation in the copolymer formed onto surface of wood. Keywords: TGA, DSC, pinewood, methacrylate, additives MenosThis study aims to apply thermal tools in the evaluation of decayed and weathered wood polymer composites prepared by in situ polymerization of methyl methacrylate (MMA) using glycidyl methacrylate (GMA) and methacrylic acid (MAA) as cross-linkers. The pine wood samples were impregnated in a vacuum/pressure system and polymerized in an oven at 90°C for 10h, using benzoyl peroxide at 1.5 wt% as catalyst. The untreated wood and composites were exposed to in vitro decay tests with Trametes versicolor and Gloeophyllum trabeum fungi, and to artificial weathering. The weight loss after tests was measured, and the characterization was performed by thermogravimetric (TGA) and differential scanning calorimetry (DSC) analysis. The mass loss caused by exposure to fungi was evidently higher in untreated wood in relation to the composites, ~2.5 to 10 times - the composites with GMA and MAA showed the highest resistance to both fungi. The composites without cross-linkers showed the higher mass loss in the artificial weathering tests (>11%), due to the leaching of part of poly(MMA) formed inside wood. By TGA and DSC analysis, we observed shifting in the temperature of thermal events related to polysaccharides and lignin after exposed to decays tests ? more significant changes were for Trametes versicolor tests. The thermograms related to weathered samples showed different results for each composite. The untreated wood and the composite without cross-linker presented loss in lignin, meanwhi... Mostrar Tudo |
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Palavras-Chave: |
Compósito; DSC; Metacrilato; Methacrylate; Pinewood; Polímero; TGA. |
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Thesagro: |
Aditivo; Madeira. |
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Thesaurus NAL: |
additives. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/111823/1/2014-MarceloL-CBATC-ThermalTools.pdf
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Marc: |
LEADER 02528nam a2200289 a 4500
001 2000392
005 2014-11-18
008 2014 bl uuuu u00u1 u #d
100 1 $aMATTOS, B.
245 $aThermal tools to evaluation of decayed and weathered wood polymer composites prepared by in situ polymerization.$h[electronic resource]
260 $aIn: CONGRESSO BRASILEIRO DE ANÁLISE TÉRMICA E CALORIMETRIA, 9., 2014, Serra Negra. Trabalhos. [S.l.]: ABRATEC$c2014
300 $a6 p.$cDisponibilizado online.
500 $aCBRATEC.
520 $aThis study aims to apply thermal tools in the evaluation of decayed and weathered wood polymer composites prepared by in situ polymerization of methyl methacrylate (MMA) using glycidyl methacrylate (GMA) and methacrylic acid (MAA) as cross-linkers. The pine wood samples were impregnated in a vacuum/pressure system and polymerized in an oven at 90°C for 10h, using benzoyl peroxide at 1.5 wt% as catalyst. The untreated wood and composites were exposed to in vitro decay tests with Trametes versicolor and Gloeophyllum trabeum fungi, and to artificial weathering. The weight loss after tests was measured, and the characterization was performed by thermogravimetric (TGA) and differential scanning calorimetry (DSC) analysis. The mass loss caused by exposure to fungi was evidently higher in untreated wood in relation to the composites, ~2.5 to 10 times - the composites with GMA and MAA showed the highest resistance to both fungi. The composites without cross-linkers showed the higher mass loss in the artificial weathering tests (>11%), due to the leaching of part of poly(MMA) formed inside wood. By TGA and DSC analysis, we observed shifting in the temperature of thermal events related to polysaccharides and lignin after exposed to decays tests ? more significant changes were for Trametes versicolor tests. The thermograms related to weathered samples showed different results for each composite. The untreated wood and the composite without cross-linker presented loss in lignin, meanwhile the composites with cross-linkers presented degradation in the copolymer formed onto surface of wood. Keywords: TGA, DSC, pinewood, methacrylate, additives
650 $aadditives
650 $aAditivo
650 $aMadeira
653 $aCompósito
653 $aDSC
653 $aMetacrilato
653 $aMethacrylate
653 $aPinewood
653 $aPolímero
653 $aTGA
700 1 $aLAZZAROTTO, M.
700 1 $aMAGALHAES, W. L. E.
700 1 $aGATTO, D. A.
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Embrapa Florestas (CNPF) |
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