Experimental study on the dielectric properties of polyacrylate dielectric elastomer

The dielectric constant of elastomeric dielectric material is an
essential physical parameter, whose value may affect the
electromechanical deformation of a dielectric elastomer actuator. Since
the dielectric constant is influenced by several external factors as
reported before, and no certain value has been confirmed to our
knowledge, in the present paper, on the basis of systematical comparison
of recent past literature, we conducted extensive works on the
measurement of dielectric properties of VHB films, involving five
influencing factors: prestretch (both equal and unequal biaxial),
electrical frequency, electrode material, stress relaxation time and
temperature. Experimental results directly show that the dielectric
response changes according to these factors, based on which we
investigate the significance of each factor, especially the interaction
of two external conditions on the dielectric constant of deformable
dielectric, by presenting a physical picture of the mechanism of
polarization.

Smart Materials and Structures  http://iopscience.iop.org/0964-1726/21/2/025006