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Registro Completo |
Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
18/11/2014 |
Data da última atualização: |
18/11/2014 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
MATTOS, B.; LAZZAROTTO, M.; MAGALHAES, W. L. E.; GATTO, D. A. |
Afiliação: |
Bruno Dufau Mattos, PIPE, UFPR; MARCELO LAZZAROTTO, CNPF; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; Darci Alberto Gatto, Universidade Federal de Pelotas. |
Título: |
Thermal tools to evaluation of decayed and weathered wood polymer composites prepared by in situ polymerization. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE ANÁLISE TÉRMICA E CALORIMETRIA, 9., 2014, Serra Negra. Trabalhos. [S.l.]: ABRATEC, 2014. |
Páginas: |
6 p. |
Descrição Física: |
Disponibilizado online. |
Idioma: |
Inglês |
Notas: |
CBRATEC. |
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 |
Palavras-Chave: |
Compósito; DSC; Metacrilato; Methacrylate; Pinewood; Polímero; TGA. |
Thesagro: |
Aditivo; Madeira. |
Thesaurus Nal: |
additives. |
Categoria do assunto: |
-- |
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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1. | | ANHOLETO, A. L.; BRANCAGLION, A. G.; SANTOS, M. D. DOS.; KAPRITCHKOFF, I. T. R.; CASTRO, K. N. de C.; CANUTO, K. M.; RODRIGUES, R. A. F.; CORREA, D. S.; PASTRE, C. J.; CHAGAS, A. C. de S. Atividade acaricida do derivado sintético do espilantol contra carrapatos de importância médica e veterinária. In: JORNADA CIENTÍFICA - EMBRAPA SÃO CARLOS, 15., 2023, São Carlos, SP. Anais... São Carlos: Embrapa Pecuária Sudeste: Embrapa Instrumentação, 2023. p. 43.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Pecuária Sudeste. |
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2. | | ANHOLETO, A.; OLIVEIRA, P. R. de; RODRIGUES, R. A. F.; SPINDOLA, C. dos S.; LABRUNA, M. B.; PIZANO, M. A.; CASTRO, K. N. de C.; MATHIAS, M. I. C. Potential action of extract of Acmella oleracea (L.) R. K. Jansen to control Amblyomma cajennense (Fabricius, 1787) (Acari: Ixodidae) ticks. Ticks and Tick-borne Diseases, v. 8, p. 65-72, 2017.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
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