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| 1. |  | POKORNY, B.; GODAR, J.; HOCH, L.; JOHNSON, J.; KONING, J. de; MEDINA, G.; STEINBRENNER, R.; VOS, V.; WEIGELT, J. A produção familiar como alternativa de um desenvolvimento sustentável para a Amazônia: lições aprendidas de iniciativas de uso florestal por produtores familiares na Amazônia boliviana, brasileira, equatoriana e peruana. Bogor: CIFOR, 2014. 174 p. il. color.| Biblioteca(s): Embrapa Amazônia Ocidental. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
28/03/2005 |
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Data da última atualização: |
28/03/2005 |
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Autoria: |
GREGÓRIO JÚNIOR, R.; MALMONGE, L. F.; FERREIRA, G. F. L.; SANTOS, W. N.; MATTOSO, L. H. C. |
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Título: |
Dielectric behavior of PVDF/POMA blends that have a low doped POMA content. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Journal of applied polymer science, v. 87, p. 752-758, 2003. |
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Idioma: |
Inglês |
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Conteúdo: |
The real () and imaginary () components of the complex permittivity of blends of PVDF [poly(vinylidene fluoride)] with POMA [poly(o-methoxyaniline)] doped with toluenosulfonic acid (TSA) containing 1, 2.5, and 5 wt % POMA-TSA were determined in the frequency interval between 102 and 3 × 106 Hz and in the temperature range from -120 up to 120°C. It was observed that the values of and had a greater increase with the POMA-TSA content and with a temperature in the region of frequencies below 10 kHz. This effect decreased with frequency and it was attributed to interfacial polarization. This polarization was caused by the blend heterogeneity, formed by conductive POMA-TSA agglomerates dispersed in an insulating matrix of PVDF. The equation of Maxwell-Garnett, modified by Cohen, was used to evaluate the permittivity and conductivity behavior of POMA-TSA in the blends. A strong decrease was observed in POMA-TSA conductivity in the blend, which was bigger the lower the POMA-TSA content in the blend. This decrease could have been caused either by the POMA dedoping during the blend preparation process or by its dispersion into the insulating matrix. |
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Palavras-Chave: |
blenda; Permittivity; Polarização Interfacial; polianilina; Polímeros condutores; PVDF. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01840naa a2200241 a 4500
001 1028882
005 2005-03-28
008 2003 bl --- 0-- u #d
100 1 $aGREGÓRIO JÚNIOR, R.
245 $aDielectric behavior of PVDF/POMA blends that have a low doped POMA content.
260 $c2003
520 $aThe real () and imaginary () components of the complex permittivity of blends of PVDF [poly(vinylidene fluoride)] with POMA [poly(o-methoxyaniline)] doped with toluenosulfonic acid (TSA) containing 1, 2.5, and 5 wt % POMA-TSA were determined in the frequency interval between 102 and 3 × 106 Hz and in the temperature range from -120 up to 120°C. It was observed that the values of and had a greater increase with the POMA-TSA content and with a temperature in the region of frequencies below 10 kHz. This effect decreased with frequency and it was attributed to interfacial polarization. This polarization was caused by the blend heterogeneity, formed by conductive POMA-TSA agglomerates dispersed in an insulating matrix of PVDF. The equation of Maxwell-Garnett, modified by Cohen, was used to evaluate the permittivity and conductivity behavior of POMA-TSA in the blends. A strong decrease was observed in POMA-TSA conductivity in the blend, which was bigger the lower the POMA-TSA content in the blend. This decrease could have been caused either by the POMA dedoping during the blend preparation process or by its dispersion into the insulating matrix.
653 $ablenda
653 $aPermittivity
653 $aPolarização Interfacial
653 $apolianilina
653 $aPolímeros condutores
653 $aPVDF
700 1 $aMALMONGE, L. F.
700 1 $aFERREIRA, G. F. L.
700 1 $aSANTOS, W. N.
700 1 $aMATTOSO, L. H. C.
773 $tJournal of applied polymer science$gv. 87, p. 752-758, 2003.
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