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Non Universal Scaling Law Exponents in the AC Dielectric Response of Polymer-Carbon Black Composites

Published online by Cambridge University Press:  03 September 2012

P. Hakizabera ,
R. Deltour  and
F. Brouers
P. Hakizabera
Affiliation:
Physique des Solides, Université Libre de Bruxelles CP233, B 1050, Belgium
R. Deltour
Affiliation:
Physique des Solides, Université Libre de Bruxelles CP233, B 1050, Belgium
F. Brouers
Affiliation:
Etude Physique des Matériaux, Université de Liège B5, B4000, Belgium
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Abstract

We report experimental and theoretical results concerning the ac properties of polymer-carbon black (CB) composites. For these materials, the theory of percolation has to be generalised to account for the complex structure of the CB and the observation that tunnelling plays an important role close to the percolation threshold. We have extended a model of Balberg [1] relating the non-universality of the exponent t to the CB morphology, to interpret the non universality of the dynamic scaling exponents t/(s+t) and s/(s+t) in the critical ac regime observed in these composites

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 367: Symposium P – Fractal Aspects of Materials , 1994 , 423
Copyright
Copyright © Materials Research Society 1995

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