The authors greatly appreciate the financial support of this work by NIH under grant 8R01EB002 078–04 and NASA under grant NAG-1–03008.
Enhanced Dielectric and Electromechanical Responses in High Dielectric Constant All-Polymer Percolative Composites †
Article first published online: 18 MAY 2004
Copyright © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 14, Issue 5, pages 501–506, May, 2004
How to Cite
Huang, C. and Zhang, Q. (2004), Enhanced Dielectric and Electromechanical Responses in High Dielectric Constant All-Polymer Percolative Composites . Adv. Funct. Mater., 14: 501–506. doi: 10.1002/adfm.200305021
- Issue published online: 18 MAY 2004
- Article first published online: 18 MAY 2004
- Manuscript Accepted: 14 NOV 2003
- Manuscript Received: 1 SEP 2003
- Dielectric constant;
- Electroactive materials;
- Polymer electroactive
A type of all-polymer percolative composite is introduced which exhibits a very high dielectric constant (> 7000). The experimental results also show that the dielectric behavior of this new class of percolative composites follows the predictions of the percolation theory and the analysis of conductive percolation phenomena. The very high dielectric constant of the all-polymer composites, which are also very flexible and possesses an elastic modulus close to that of the insulation polymer matrix, makes it possible to induce a high electromechanical response under a very reduced electric field (a strain of 2.65 % with an elastic energy density of 0.18 J cm–3 can be achieved under a field of 16 MV m–1). Data analysis also suggests that within the composites, the non-uniform local field distribution as well as interface effects can significantly enhance the strain responses. Furthermore, the experimental data as well as the data analysis indicate that conduction loss in the composites will not affect the strain hysteresis.