20 October 2009 Sub-percolative composites for dielectric elastomer actuators
Author Affiliations +
Proceedings Volume 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering; 74930Q (2009) https://doi.org/10.1117/12.841076
Event: Second International Conference on Smart Materials and Nanotechnology in Engineering, 2009, Weihai, China
Abstract
Dielectric elastomer actuators (DEA) based on Maxwell-stress induced deformation are considered for many potential applications where high actuation strain and energy are required. However, the high electric field and voltage required to drive them limits some of the applications. The high driving field could be lowered by developing composite materials with high-electromechanical response. In this study, a sub-percolative approach for increasing the electromechanical response has been investigated. Composites with conductive carbon black (CB) particles introduced into a soft rubber matrix poly-(styrene-co-ethylene-co-butylene-co-styrene) (SEBS) were prepared by a drop-casting method. The resulting composites were characterized by dielectric spectroscopy, tensile tests, and for electric breakdown strength. The results showed a substantial increase of the relative permittivity at low volume percentages, thereby preserving the mechanical properties of the base soft polymer material. Young's modulus was found to increase with content of CB, however, due to the low volume percentages used, the composites still retain relatively low stiffness, as it is required to achieve high actuation strain. A serious drawback of the approach is the large decrease of the composite electric breakdown strength, due to the local enhancement in the electric field, such that breakdown events will occur at a lower macroscopic electric field.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
H. Stoyanov, H. Stoyanov, M. Kollosche, M. Kollosche, D. McCarthy, D. McCarthy, A. Becker, A. Becker, S. Risse, S. Risse, G. Kofod, G. Kofod, } "Sub-percolative composites for dielectric elastomer actuators", Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74930Q (20 October 2009); doi: 10.1117/12.841076; https://doi.org/10.1117/12.841076
PROCEEDINGS
8 PAGES


SHARE
Back to Top