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| 14. |  | CARVALHO, M. da C, S.; CERRI, C. C. Distribuição de raízes e atributos químicos de um neossolo quartzarênico sob pastagem degradada submetida a práticas de recuperação. In: REUNIÃO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRIÇÃO DE PLANTAS, 28., REUNIÃO BRASILEIRA SOBRE MICORRIZAS, 12., SIMPÓSIO BRASILEIRO DE MICROBIOLOGIA DO SOLO, 10., REUNIÃO BRASILEIRA DE BIOLOGIA DO SOLO, 7., 2008, Londrina, PR. Desafios para o uso do solo com eficiência e qualidade ambiental: anais... Londrina: SBCS: Embrapa Soja, 2008.| Biblioteca(s): Embrapa Algodão. |
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| Registros recuperados : 69 | |
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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: |
22/12/1999 |
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Data da última atualização: |
22/12/1999 |
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Autoria: |
MATTOSO, L. H. C.; MALMONGE, L. F. |
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Afiliação: |
EMBRAPA-CNPDIA; USP-IQSC. |
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Título: |
Structure and properties of blends of polyaniline and PVDF. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: WORKSHOP ON STRUCTURAL CHARACTERIZATION OF POLYMERS BY X-RAY SCATTERING (WORKPOL), July 1996, Sao Carlos, SP. Programme, abstracts and list of participants... Sao Carlos: USP-IFSC, 1996. |
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Páginas: |
p.1. |
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Idioma: |
Inglês |
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Conteúdo: |
Blends of poly(o-methoxyaniline)-POMA and poly(vinylidene fluoride)-PVDF exhibiting electrical conductivity with extremely low percolation threshold and great mechanical strength were prepared by casting in the doped state at various compositions. The structure and morphology of these blends depend on the dopant nature, doping state, film preparation conditions and blend composition. These belnds were studied by x-ray diffraction, scanning electron microscopy, thermal gravimetric analysis and conductivity measurements. For blends undoped or doped with trifluoroacetic acid the spherulitic morphology, peculiar of pure PVDF, was predominately preserved for contents as high as 25% of POMA in the blend. However, blends doped with toluene sulphonic acid (TSA) presented a transition in morphology from spherulites to fibris (characteristic of polyanilines), for increasing POMA content. Also, blends doped with TSA presented better conductivity and thermal stability. The conductivity of such blends remained practically unchanged in the range of 10E-3 to 10E-4 S/cm for long periods (500h), after treatment at temperatures of 70 and 90 Celsius degrees. Thermal analysis demonstrated that no mass loss was observed up to temperatures as high as the melting point of PVDF. The crystalline structure characteristic of PVDF is practically not affected by the presence of up to 25% of POMA in the blend. For higher POMA contents the crystalline diffraction peakes of the conducting polymer begin to appear as those of PVDF vanish (...) MenosBlends of poly(o-methoxyaniline)-POMA and poly(vinylidene fluoride)-PVDF exhibiting electrical conductivity with extremely low percolation threshold and great mechanical strength were prepared by casting in the doped state at various compositions. The structure and morphology of these blends depend on the dopant nature, doping state, film preparation conditions and blend composition. These belnds were studied by x-ray diffraction, scanning electron microscopy, thermal gravimetric analysis and conductivity measurements. For blends undoped or doped with trifluoroacetic acid the spherulitic morphology, peculiar of pure PVDF, was predominately preserved for contents as high as 25% of POMA in the blend. However, blends doped with toluene sulphonic acid (TSA) presented a transition in morphology from spherulites to fibris (characteristic of polyanilines), for increasing POMA content. Also, blends doped with TSA presented better conductivity and thermal stability. The conductivity of such blends remained practically unchanged in the range of 10E-3 to 10E-4 S/cm for long periods (500h), after treatment at temperatures of 70 and 90 Celsius degrees. Thermal analysis demonstrated that no mass loss was observed up to temperatures as high as the melting point of PVDF. The crystalline structure characteristic of PVDF is practically not affected by the presence of up to 25% of POMA in the blend. For higher POMA contents the crystalline diffraction peakes of the conducting polymer begin to ... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02065naa a2200145 a 4500
001 1027108
005 1999-12-22
008 1996 bl uuuu u00u1 u #d
100 1 $aMATTOSO, L. H. C.
245 $aStructure and properties of blends of polyaniline and PVDF.
260 $c1996
300 $ap.1.
520 $aBlends of poly(o-methoxyaniline)-POMA and poly(vinylidene fluoride)-PVDF exhibiting electrical conductivity with extremely low percolation threshold and great mechanical strength were prepared by casting in the doped state at various compositions. The structure and morphology of these blends depend on the dopant nature, doping state, film preparation conditions and blend composition. These belnds were studied by x-ray diffraction, scanning electron microscopy, thermal gravimetric analysis and conductivity measurements. For blends undoped or doped with trifluoroacetic acid the spherulitic morphology, peculiar of pure PVDF, was predominately preserved for contents as high as 25% of POMA in the blend. However, blends doped with toluene sulphonic acid (TSA) presented a transition in morphology from spherulites to fibris (characteristic of polyanilines), for increasing POMA content. Also, blends doped with TSA presented better conductivity and thermal stability. The conductivity of such blends remained practically unchanged in the range of 10E-3 to 10E-4 S/cm for long periods (500h), after treatment at temperatures of 70 and 90 Celsius degrees. Thermal analysis demonstrated that no mass loss was observed up to temperatures as high as the melting point of PVDF. The crystalline structure characteristic of PVDF is practically not affected by the presence of up to 25% of POMA in the blend. For higher POMA contents the crystalline diffraction peakes of the conducting polymer begin to appear as those of PVDF vanish (...)
700 1 $aMALMONGE, L. F.
773 $tIn: WORKSHOP ON STRUCTURAL CHARACTERIZATION OF POLYMERS BY X-RAY SCATTERING (WORKPOL), July 1996, Sao Carlos, SP. Programme, abstracts and list of participants... Sao Carlos: USP-IFSC, 1996.
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Embrapa Instrumentação (CNPDIA) |
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