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Analysis and Prospects of enhanced Silicone Materials for Applications of Dielectric Elastomer Transducers

Mittwoch (22.05.2019)
10:40 - 11:00 Uhr
Bestandteil von:

Transducers based on dielectric elastomers (DE) are light-weight, energy efficient and especially multilayer topologies offer enormous potentials for applications. The functional principal described by the electrostatic pressure results in compressions and generated force that are proportional to the permittivity εr and maximum electrical field strength Emax squared, while the compression additionally increases with the reciprocal of the modulus Y [1].

Thus, to increase the resulting work output material modifications should aim at maximizing the field strength Emax with first priority directly followed by increasing the permittivity εr due to its square influence, while the modulus Y also can be used to adapt the transducer’s impedance. As elastomer material acryl, polyurethane or silicone is typically used. While the first two are characterized by insufficiently high viscose [1], silicone materials offer constant and almost lost free electromechanical properties over a typically specified temperature range for technical applications. However, the comparable low permittivity of standard silicone yields a small work output. Consequently, Wacker Chemie focused on increasing the permittivity and developed in 2018 a new silicone film called ELASTOSIL Film 5030 with approximately doubled permittivity.

Within this contribution, we present the full experimental evaluation of this new material including the static as well as dynamic behavior of the silicone material. By applying a graphite-based electrode the electrical and electromechanically coupled behavior is investigated according to the standards defined in [2], too, and compared to the standard silicone material as ELASTOSIL Film 2030. Besides the increased permittivity the Young’s modulus of the ELASTOSIL Film 5030 can be adjusted in a range between 0.1 MPa and 2.5 MPa, i.e. material adaptions for several applications for example in soft robotic devices or automation technology are possible. Based on the obtained results different integration and application possibilities of this smart actuators will be investigated and outlined including DE stack-transducers in valves or switches [3] as well as actuators for active vibrations suppression and noise cancellation.

[1] Maas et al: Actuator Design and Automated Manufacturing Process for DEAP-based Multilayer Stack-Actuators. Meccanica, 2015.

[2] Carpi et al.: Standards for dielectric elastomer transducers. Smart Mater. Struct. Vol. 24(10), 2015.

Prof. Dr. Jürgen Maas
Technische Universität Berlin
Weitere Autoren/Referenten:
  • Johann Ranzinger
    Technische Universität Berlin
  • Ozan Çabuk
    Technische Universität Berlin
  • Dr. Andreas Köllnberger
    Wacker Chemie AG