Enhanced Dielectric and Electromechanical Responses in High Dielectric Constant All‐Polymer Percolative Composites

Abstract

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.

Dielectric properties of binary polyvinylidene fluoride/barium titanate nanocomposites and their nanographite doped hybrids

“…-12 F·m -1 ) and E the applied field [16]. For instance, to generate an energy density of 0.1 J/cm 3 , which is the value for the high performing piezoelectric ceramics, assuming a 50% energy conversion efficiency, the electric field required is 47.5 MV/m for a capacitor with a dielectric constant of 10 (permittivity of pure PVDF).…”

The microstructure and dielectric properties of modified poly(aryl ether ketone)/metallophthalocyanine composites

“…In polymer composites, the compatibility between the filler and the polymer matrix can be enhanced by adding a dispersant, 14 forming intermolecular hydrogen bonding, [15][16][17] crosslinking 18,19 and grafting [20][21][22][23][24][25] and so on. The resulting products are fully functionalized nanopolymers and improve the compatibility of the two and three components, offer good dielectric and mechanical properties and increase the breakdown field as well.…”

Electroactive Thermoplastic Dielectric Elastomers as a New Generation Polymer Actuators

“…Thus, many endeavors have mainly focused on enhancing a dielectric constant of dielectric elastomer itself or dispersing high dielectric fillers in order to improve the Maxwell stress effect and thus to enhance the electric actuation (Huang & Zhang, 2004, 2005Xu et al, 2002;Zhang et al, 2002). Unfortunately, the true electrostriction effect, in particular, Q parameter is rarely taken into careful consideration in the electric actuation of dielectric elastomers.…”