Dielectric elastomer actuator with excellent electromechanical performance using slide-ring materials/barium titanate composites
JOURNAL OF MATERIALS CHEMISTRY A(2015)
摘要
Dielectric elastomers are referred to as artificial muscles because of their excellent properties. However, the need for high operating voltage limits their practical application. A reduction of the operating voltage can be achieved with novel elastomers offering intrinsically high electromechanical sensitivity. In this work, slide-ring materials with a necklace-like molecular structure are prepared as dielectric elastomer materials. These slide-ring materials are found to exhibit high dielectric constants, low elastic moduli, and high electromechanical sensitivity due to their special structural characteristics. Barium titanate particles modified by g-methacryloxypropyl trimethoxy silane (KH570) are incorporated into the slide-ring materials to further improve the actuated performance of the slide-ring materials. A high actuated strain (26%) at a relatively low electric field (12 kV mm(-1)) is obtained on the circular membrane actuator without any pre-strains, much more excellent than those of other dielectric elastomers reported in the literature. In addition, an obviously larger displacement is achieved by the slide-ring composite than that of commercial dielectric elastomer VHB 4910 on a cone-type actuator at the same electric field. These results demonstrate that our research might help to establish a new synthetic route to high performance dielectric elastomers.
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关键词
dielectric elastomer actuator,excellent electromechanical performance,materials/barium titanate,slide-ring
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