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Registro Completo
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
28/03/2005 |
Data da última atualização: |
28/03/2005 |
Autoria: |
GREGÓRIO JÚNIOR, R.; MALMONGE, L. F.; FERREIRA, G. F. L.; SANTOS, W. N.; MATTOSO, L. H. C. |
Título: |
Dielectric behavior of PVDF/POMA blends that have a low doped POMA content. |
Ano de publicação: |
2003 |
Fonte/Imprenta: |
Journal of applied polymer science, v. 87, p. 752-758, 2003. |
Idioma: |
Inglês |
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. |
Palavras-Chave: |
blenda; Permittivity; Polarização Interfacial; polianilina; Polímeros condutores; PVDF. |
Categoria do assunto: |
-- |
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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