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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
25/04/2003 |
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Data da última atualização: |
25/04/2003 |
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Autoria: |
PATERNO, L. G.; CONSTANTINO, C. J. L.; OLIVEIRA JR. O. N.; MATTOSO, L. H. C. |
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Afiliação: |
UFSCar-Departamento de Engenharia de Materiais, São Carlos, SP; USP-Instituto de Física de São Carlos, São Carlos, SP; Embrapa Instrumentação Agropecuária, São Carlos, SP. |
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Título: |
Self-assembled films of poly(o-ethoxyaniline) complexed with sulfonated lignin. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Colloids and Subsurfaces B: Biointerfaces, Amsterdam, v. 23, p. 257-262, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
The interaction of poly)o-ethoxyaniline) (POEA) doped with HC1 and sulfonated lignin (SL) was investigated using UV-Vis spectroscopy in order to probe the influence of pH and quantity of SL on the formation of a polyelectrolyte complex. The introduction of SL into the HC1 doped POEA solution screens the positive charges of the protonated POEA allowing further protons to be pumped into the conducting polymers thus increasing its doping level. In addition, the strong interaction between these two electrolytes caused POEA to remain doped within a wid pH range. Layers were built from aqueous solutions of the complex formed by POEA and SL which were alternated with either pure POEA or sulfonated polystyrene in the form of layer-by-layer films. The resultin multilayer films remained doped even at pH 9.0, due to the strong complex formation, which prevents POEA from deprotonating. Surface potential measurements showed that the potential for the POEA + SL complex is more positive than for films with each layer investigated separately, thus confirming the strong interaction between POEA and SL. |
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Palavras-Chave: |
Complexes; Conducting polymers; Espectroscopia; Polianilina; Polímero; Polyanilines; Polyelectrolytes; Self-assembly. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01830naa a2200253 a 4500
001 1024615
005 2003-04-25
008 2002 bl --- 0-- u #d
100 1 $aPATERNO, L. G.
245 $aSelf-assembled films of poly(o-ethoxyaniline) complexed with sulfonated lignin.
260 $c2002
520 $aThe interaction of poly)o-ethoxyaniline) (POEA) doped with HC1 and sulfonated lignin (SL) was investigated using UV-Vis spectroscopy in order to probe the influence of pH and quantity of SL on the formation of a polyelectrolyte complex. The introduction of SL into the HC1 doped POEA solution screens the positive charges of the protonated POEA allowing further protons to be pumped into the conducting polymers thus increasing its doping level. In addition, the strong interaction between these two electrolytes caused POEA to remain doped within a wid pH range. Layers were built from aqueous solutions of the complex formed by POEA and SL which were alternated with either pure POEA or sulfonated polystyrene in the form of layer-by-layer films. The resultin multilayer films remained doped even at pH 9.0, due to the strong complex formation, which prevents POEA from deprotonating. Surface potential measurements showed that the potential for the POEA + SL complex is more positive than for films with each layer investigated separately, thus confirming the strong interaction between POEA and SL.
653 $aComplexes
653 $aConducting polymers
653 $aEspectroscopia
653 $aPolianilina
653 $aPolímero
653 $aPolyanilines
653 $aPolyelectrolytes
653 $aSelf-assembly
700 1 $aCONSTANTINO, C. J. L.
700 1 $aOLIVEIRA JR. O. N.
700 1 $aMATTOSO, L. H. C.
773 $tColloids and Subsurfaces B: Biointerfaces, Amsterdam$gv. 23, p. 257-262, 2002.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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| Registros recuperados : 22 | |
| 21. |  | FRÓES, A. L.; ALVES, M. E. dos S.; PALHARINI, W. G.; SANTOS, S. A. dos; MARSCHALL, I. R.; MARQUES, R. F.; SILVA, C. J. da; CONCENCO, G.; LEME FILHO, J. R. A. Controle químico de plantas daninhas tolerantes ao glyphosate na cultura do pinhão-manso. In: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2014, Dourados. Resumos... Brasília, DF: Embrapa, 2014. 1 CD-ROM; JIPE 2014.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 22. | | RODRIGUES, D. da C.; ALVES, M. E. dos S.; PALHARINI, W. G.; SANTOS, S. A. dos; MARSCHALL, I. R.; MARQUES, R. F.; CONCENCO, G.; SALTON, J. C.; TOMAZI, M. Composição de plantas daninhas em áreas agrícolas consolidadas em função do preparo do solo. In: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2014, Dourados. Resumos... Brasília, DF: Embrapa, 2014. 1 CD-ROM; JIPE 2014.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| Registros recuperados : 22 | |
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