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28 March 2011Dielectric elastomer actuators with enhanced permittivity and strain
The impact of the modification of silicone rubber with barium titanate particles on the permittivity and hence on the
performance of dielectric elastomer actuators has been investigated. Barium titanate powders with different particle sizes
in the micrometer and nanometer range were used in this study. The mechanical properties of the composite materials in
terms of the Young's modulus in tension and compression load as well as the viscoelastic behavior in shear load were
experimentally determined. Additionally, the electric properties like permittivity, specific conductivity and electric
breakdown field strength were evaluated. Model film actuators with the modified silicone material were prepared and
their actuation strain was measured. With a concentration of 20 vol.% barium titanate particles, an enhancement of the
permittivity of 140 % and an increase of the actuation strain of about 100 % with respect to the unmodified material
could be achieved. Furthermore, first multilayer actuators were manufactured with an automatic spin coating process and
their permittivity and strain were measured. The results of these investigations are in good agreement with the data of the
experiments with single layer dielectric elastomer films.
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Holger Böse, Detlev Uhl, Klaus Flittner, Helmut Schlaak, "Dielectric elastomer actuators with enhanced permittivity and strain," Proc. SPIE 7976, Electroactive Polymer Actuators and Devices (EAPAD) 2011, 79762J (28 March 2011);