Dielectric Elastomers

Dielectric elastomers belong to the family of electroactive polymers (EAP) and are flat elastomer composites made of an electrically non-conductive elastomer film covered on both sides by conductive and stretchable electrode layers. Electrotechnically, this is a flexible and expandable capacitor.

The dielectric between the electrodes can consist of different elastomers. Silicone elastomer has the main advantage that it is chemically inert, can be used in a wide temperature range (about -50 to +200 °C) and is extremely variable in its mechanical properties. The electrode layers consist, for example, of carbon or metal particles in a silicone matrix. Dielectric elastomers can be used for very different technologies such as mechanical sensors, actuators and generators.

At the Center Smart Materials and Adaptive Systems, dielectric elastomers can be manufactured from various material components and in a wide variety of shapes. Various manufacturing processes are available for this purpose.


Competences:

  • Know-how in elastomer chemistry and the control of structure-property relationships
  • Adjustment of electrical properties with additives
  • Understanding the composite properties of multilayer systems
  • Manufacturing processes of dielectric elastomers


Offer:

  • Development of dielectric elastomer materials
  • Production of individually adapted dielectric elastomers
  • Adaptation of manufacturing processes for dielectric elastomers
  • Characterization and testing of dielectric elastomers

Design of dielectric elastomer films

Design scheme of dielectric elastomers.
© Fraunhofer ISC
Design scheme of dielectric elastomers.

Dielectric elastomers (DE) consist of a highly stretchable elastomer film (silicone, acrylic, polyurethane, natural rubber) coated on both sides with stretchable electrodes.

  • Extremely stretchable (>100%)
  • Flexible
  • Thin (0.5 mm)
     

Dielectric elastomers can be produced on a roll to roll coating equipment by means of slot die and rotary screen printing over a large area (0.5 m wide, 100 m long).