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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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Embrapa Instrumentação (CNPDIA) |
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Registro Completo
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
18/01/2002 |
Data da última atualização: |
18/01/2010 |
Autoria: |
DE-POLLI, H.; DUQUE, F. F.; ALMEIDA, D. L. de. |
Título: |
Formação de legumineira e capineira. |
Ano de publicação: |
1986 |
Fonte/Imprenta: |
Seropédica: EMBRAPA-UAPNPBS, 1986. |
Páginas: |
5 p. |
Série: |
(EMBRAPA-UAPNPBS. Documentos, 4).
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ISSN: |
0102-5260 |
Idioma: |
Português |
Conteúdo: |
Histórico da área. |
Palavras-Chave: |
Adubação mineral; Adubação orgânica; Elephant grass; Feed grasses; Feed legumes; Inoculation; Pasture. |
Thesagro: |
Calagem; Capim; Capim Elefante; Capim Guatemala; Gramínea; Gramínea Forrageira; Inoculação; Legume; Leguminosa; Leguminosa Forrageira; Pastagem; Ph. |
Thesaurus NAL: |
grasses; legumes; organic matter. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CNPAB-2010/27194/1/doc004.pdf
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Marc: |
LEADER 01079nam a2200433 a 4500 001 1623334 005 2010-01-18 008 1986 bl uuuu u0uu1 u #d 022 $a0102-5260 100 1 $aDE-POLLI, H. 245 $aFormação de legumineira e capineira. 260 $aSeropédica: EMBRAPA-UAPNPBS$c1986 300 $a5 p. 490 $a(EMBRAPA-UAPNPBS. Documentos, 4). 520 $aHistórico da área. 650 $agrasses 650 $alegumes 650 $aorganic matter 650 $aCalagem 650 $aCapim 650 $aCapim Elefante 650 $aCapim Guatemala 650 $aGramínea 650 $aGramínea Forrageira 650 $aInoculação 650 $aLegume 650 $aLeguminosa 650 $aLeguminosa Forrageira 650 $aPastagem 650 $aPh 653 $aAdubação mineral 653 $aAdubação orgânica 653 $aElephant grass 653 $aFeed grasses 653 $aFeed legumes 653 $aInoculation 653 $aPasture 700 1 $aDUQUE, F. F. 700 1 $aALMEIDA, D. L. de
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Embrapa Agrobiologia (CNPAB) |
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