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Dielectric properties of Poly(vinylidene fluoride)/CaCu3Ti4O12 composites

Thomas, P and Varughese, KT and Dwarakanath, K and Varma, KBR (2010) Dielectric properties of Poly(vinylidene fluoride)/CaCu3Ti4O12 composites. In: Composites Science and Technology, 70 (3). pp. 539-545.

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Abstract

The possibility of obtaining relatively high dielectric constant polymer-ceramic composite by incorporating the giant dielectric constant material, CaCu3Ti4O12 (CCTO) in a Poly(vinylidene fluoride) (PVDF) polymer matrix by melt mixing and hot pressing process was demonstrated. The structure, morphology and dielectric properties of the composites were characterized using X-ray diffraction, Thermal analysis. scanning electron microscope, and impedance analyzer. The effective dielectric constant a(epsilon(eff)) of the composite increased with increase in the volume fraction of CCTO at all the frequencies(100 Hz-1 MHz) under study. The dielectric loss did not show any variation up to 40% loading of CCTO, but showed an increasing trend beyond 40%. The room temperature dielectric constant as high as 95 at 100 Hz has been realized for the composite with 55 vol.% of CCTO, which has increased to about 190 at 150 degrees C. Theoretical models like Maxwell's, Clausius-Mossotti, Effective medium theory, logarithmic law and Yamada were employed to rationalize the dielectric behaviour of the composite and discussed. (C) 2010 Published by Elsevier Ltd.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Ceramics; Polymer matrix composites (PMCs); Electrical properties; Scanning electron microscopy (SEM)
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 23 Mar 2010 10:44
Last Modified: 19 Sep 2010 05:57
URI: http://eprints.iisc.ernet.in/id/eprint/26404

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