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Registro Completo |
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
25/04/2003 |
Data da última atualização: |
25/04/2003 |
Autoria: |
PATERNO, L. G.; CONSTANTINO, C. J. L.; OLIVEIRA JR. O. N.; MATTOSO, L. H. C. |
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. |
Título: |
Self-assembled films of poly(o-ethoxyaniline) complexed with sulfonated lignin. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
Colloids and Subsurfaces B: Biointerfaces, Amsterdam, v. 23, p. 257-262, 2002. |
Idioma: |
Inglês |
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. |
Palavras-Chave: |
Complexes; Conducting polymers; Espectroscopia; Polianilina; Polímero; Polyanilines; Polyelectrolytes; Self-assembly. |
Categoria do assunto: |
-- |
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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Embrapa Instrumentação (CNPDIA) |
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