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Dielectric and rheological properties of polyaniline organic dispersions

Published online by Cambridge University Press:  03 April 2009

N. Bohli ,
A. Belhadj Mohamed ,
V. Vignéras-Lefèbvre  and
J.-L. Miane
N. Bohli*
Affiliation:
Laboratoire de Nanomatériaux et des Systèmes pour l'Énergie, Centre de Recherches et de Technologies de l'Énergie, Technopole de Borj Cedria, BP 95, 2050 Hammam Lif, Tunisia Laboratoire de l'Intégration du Matériau au Système, UMR CNRS 5218, ENSCPB, 16 av. Pey Berland, 33607 Pessac, France
A. Belhadj Mohamed
Affiliation:
Laboratoire de Nanomatériaux et des Systèmes pour l'Énergie, Centre de Recherches et de Technologies de l'Énergie, Technopole de Borj Cedria, BP 95, 2050 Hammam Lif, Tunisia
V. Vignéras-Lefèbvre
Affiliation:
Laboratoire de l'Intégration du Matériau au Système, UMR CNRS 5218, ENSCPB, 16 av. Pey Berland, 33607 Pessac, France
J.-L. Miane
Affiliation:
Laboratoire de l'Intégration du Matériau au Système, UMR CNRS 5218, ENSCPB, 16 av. Pey Berland, 33607 Pessac, France
*
nadra.bohli@crten.rnrt.tn
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Abstract

This paper reports the examination of the evolution of polyaniline-organic solvent interactions in the temperature range of 294–353 K. For this purpose, rheological and dielectric investigations have been undertaken for dispersions of plast-doped polyaniline in two different solvents (dichloroacetic acid and formic acid/dichloroacetic acid mixture). Dielectric permittivity has been investigated using the open ended coaxial line method in the frequency range of [100 MHz, 10 GHz]. Dielectric loss spectra of both dispersions showed a relaxation peak which was well fitted by Havriliak-Negami function. The relaxation was attributed to a Maxwell Wagner Sillars relaxation within polyaniline clusters. The difference found between relaxation parameters of the pure solvent and polyaniline dispersions was attributed to the solvent/polyaniline interactions. The relaxation time relative to the PANI/DCAA dispersion followed an Arrhenius law. While a Vogel-Fulcher-Tammann law was found for the relaxation time of PANI/DCAA-FA dispersion. Above a certain temperature, 318 K for PANI/DCAA and 313 K for PANI/DCAA-FA, the rheological parameters of the dispersions changed, thus indicating a morphological change of polyaniline in the dispersion. In the same range of temperature, α and β relaxation parameters undergo significant changes. Those changes in dielectric and rheological parameters seem to be related to a structural change occurring in the polyaniline organic dispersion systems while increasing temperature. An interesting correlation between permittivity and viscosity was obtained.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 46 , Issue 2 , May 2009 , 20405
Copyright
© EDP Sciences, 2009

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