Temperature dependence of the dielectric constant of acrylic dielectric elastomer

The dielectric constant is an essential electrical parameter to the
achievable voltage-induced deformation of the dielectric
elastomer. This paper primarily focuses on the temperature
dependence of the dielectric constant (within the range of 173 K
to 373 K) for the most widely used acrylic dielectric
elastomer (VHB 4910). First the dielectric constant was investigated
experimentally with the broadband dielectric spectrometer
(BDS). Results showed that the dielectric constant first increased
with temperature up to a peak value and then dropped to a
relative small value. Then by analyzing the fitted curves, the Cole–Cole
dispersion equation was found better to characterize the
rising process before the peak values than the Debye dispersion
equation,
while the decrease process afterward can be well described
by the simple Debye model. Finally, a mathematical model of dielectric
constant of VHB 4910 was obtained from the fitted results
which can be used to further probe the electromechanical stability
of the dielectric elastomers.

Applied Physics A:  http://www.springerlink.com/content/r884t6q543455722/