Dielectric properties of ternary melt processed blends

Abstract

Thermal, morphological and dielectric properties of conductive thermoplastic blends based on polystyrene, styrene-butadiene-styrene block copolymer and doped polyaniline have been investigated with special emphasis on the effect of doped polyaniline concentration. Blends were prepared by melt blending using an internal mixer. Morphological studies by scanning electron microscopy of cryofractured surfaces indicated that thermoplastic matrix had a better miscibility with the presence of copolymer as compatibilizer and also good dispersability and structuring of doped polyaniline particles within polystyrene. A reduction in impedance from 26 to 2 M Omega at 10 Hz, with the increasing polyaniline content is also observed. the blends can be used for antistatic applications. From the fit to the impedance spectroscopy data we obtained the relaxation strength, the depression angle and the relaxation. (C) 2008 Elsevier B.V. All rights reserved.