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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
12/11/2015 |
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Data da última atualização: |
03/02/2016 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MATTOS, B. D.; CADEMARTORI, P. H. G. de; MISSIO, A. L.; GATTO, D. A.; MAGALHAES, W. L. E. |
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Afiliação: |
BRUNO D. MATTOS, Universidade Federal do Parana; PEDRO H. G. DE CADEMARTORI, Universidade Federal do Paraná; ANDRE L. MISSIO, Universidade Federal de Santa Maria; DARCI A. GATTO, Universidade Federal de Pelotas; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF. |
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Título: |
Wood-polymer composites prepared by free radical in situ polymerization of methacrylate monomers into fast-growing pinewood. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Wood Science and Technology, v. 49, n. 6, p. 1281-1294, Nov. 2015. |
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DOI: |
10.1007/s00226-015-0761-5 |
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Idioma: |
Inglês |
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Conteúdo: |
The aim of this study was to evaluate treatability, morphology and mechanical resistance of composites prepared by in situ polymerization of methyl methacrylate on Pinus taeda wood using glycidyl methacrylate and methacrylic acid as cross-linkers. Treatment consisted of impregnation by vacuum/pressure and polymerization at 90 C for 10 h using heat catalyst. The treatability was characterized by loads of monomers, conversion of monomers to polymers, weight percent gain, permanent swelling, and densification. The morphology was characterized by SEM images, X-ray diffraction, confocal Raman microscopy, and mechanical properties by static bending, shore D hardness and brittleness tests. Composites with cross-linkers showed the highest monomers retention, and the highest conversion. Brittleness of the composites increased significantly, modulus of elasticity increased from 17 to 32 %, flexural strength increased by 22.4?45.3 %, and shore D hardness increased between 60.2 and 89.6 %. The GMA cross-linker provided the highest increments for mechanical resistance. |
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Palavras-Chave: |
In situ polymerization; Metacrilato; Methacrylate; Pinewood; Polimerização in situ; Polímero; Tratamento de madeira; Wood polymer. |
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Thesagro: |
Madeira; Pinus Taeda. |
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Thesaurus Nal: |
wood treatment. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02029naa a2200313 a 4500
001 2028471
005 2016-02-03
008 2015 bl uuuu u00u1 u #d
024 7 $a10.1007/s00226-015-0761-5$2DOI
100 1 $aMATTOS, B. D.
245 $aWood-polymer composites prepared by free radical in situ polymerization of methacrylate monomers into fast-growing pinewood.$h[electronic resource]
260 $c2015
520 $aThe aim of this study was to evaluate treatability, morphology and mechanical resistance of composites prepared by in situ polymerization of methyl methacrylate on Pinus taeda wood using glycidyl methacrylate and methacrylic acid as cross-linkers. Treatment consisted of impregnation by vacuum/pressure and polymerization at 90 C for 10 h using heat catalyst. The treatability was characterized by loads of monomers, conversion of monomers to polymers, weight percent gain, permanent swelling, and densification. The morphology was characterized by SEM images, X-ray diffraction, confocal Raman microscopy, and mechanical properties by static bending, shore D hardness and brittleness tests. Composites with cross-linkers showed the highest monomers retention, and the highest conversion. Brittleness of the composites increased significantly, modulus of elasticity increased from 17 to 32 %, flexural strength increased by 22.4?45.3 %, and shore D hardness increased between 60.2 and 89.6 %. The GMA cross-linker provided the highest increments for mechanical resistance.
650 $awood treatment
650 $aMadeira
650 $aPinus Taeda
653 $aIn situ polymerization
653 $aMetacrilato
653 $aMethacrylate
653 $aPinewood
653 $aPolimerização in situ
653 $aPolímero
653 $aTratamento de madeira
653 $aWood polymer
700 1 $aCADEMARTORI, P. H. G. de
700 1 $aMISSIO, A. L.
700 1 $aGATTO, D. A.
700 1 $aMAGALHAES, W. L. E.
773 $tWood Science and Technology$gv. 49, n. 6, p. 1281-1294, Nov. 2015.
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Registro original: |
Embrapa Florestas (CNPF) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Agroindústria de Alimentos. Para informações adicionais entre em contato com ctaa.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Agroindústria de Alimentos. |
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Data corrente: |
01/10/2014 |
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Data da última atualização: |
03/06/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
FREITAS-SILVA, O.; OLIVEIRA, P. S. de; FREIRE JUNIOR, M. |
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Afiliação: |
OTNIEL FREITAS SILVA, CTAA; PATRÍCIA SOUZA DE OLIVEIRA, UFRRJ; MURILLO FREIRE JUNIOR, CTAA. |
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Título: |
Potential of electron beams to control mycotoxigenic fungi in food. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Food Engineering Reviews, v. 7, n. 2, p. 160-170, jun. 2015. |
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DOI: |
https://doi.org/10.1007/s12393-014-9093-8. |
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Idioma: |
Inglês |
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Conteúdo: |
Foods in general are excellent sources for growth of fungi. These microorganisms can infect food and grow whenever the ideal temperature and moisture conditions for the particular species are present, causing large losses during storage. Furthermore, some fungal species produce mycotoxins, which are compounds that are toxic to humans and animals. The use of electron beams has been shown effective in decontaminating foods, packaging materials, plastic articles and surgical and biological materials, among others. The ease of handling, low cost and employment of electricity to generate ionizing radiation instead of radioactive material such as cobalt-60 are factors that have increased the use of this method. Because of the growing use of electron beams on foods to control pathogenic microorganisms, this review focuses on their use to control fungi that produce mycotoxins on foods, covering the suitable doses, effects on food quality, microorganism reduction rates, applications in the food industry and legislation on use and operational safety. |
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Palavras-Chave: |
Fungos; Irradiação de alimentos; Micotoxinas. |
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Thesagro: |
Segurança Alimentar. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 01674naa a2200205 a 4500
001 1996237
005 2020-06-03
008 2015 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s12393-014-9093-8.$2DOI
100 1 $aFREITAS-SILVA, O.
245 $aPotential of electron beams to control mycotoxigenic fungi in food.
260 $c2015
520 $aFoods in general are excellent sources for growth of fungi. These microorganisms can infect food and grow whenever the ideal temperature and moisture conditions for the particular species are present, causing large losses during storage. Furthermore, some fungal species produce mycotoxins, which are compounds that are toxic to humans and animals. The use of electron beams has been shown effective in decontaminating foods, packaging materials, plastic articles and surgical and biological materials, among others. The ease of handling, low cost and employment of electricity to generate ionizing radiation instead of radioactive material such as cobalt-60 are factors that have increased the use of this method. Because of the growing use of electron beams on foods to control pathogenic microorganisms, this review focuses on their use to control fungi that produce mycotoxins on foods, covering the suitable doses, effects on food quality, microorganism reduction rates, applications in the food industry and legislation on use and operational safety.
650 $aSegurança Alimentar
653 $aFungos
653 $aIrradiação de alimentos
653 $aMicotoxinas
700 1 $aOLIVEIRA, P. S. de
700 1 $aFREIRE JUNIOR, M.
773 $tFood Engineering Reviews$gv. 7, n. 2, p. 160-170, jun. 2015.
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Embrapa Agroindústria de Alimentos (CTAA) |
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