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Silicona de alta permitividad para actuadores de elastómero dieléctrico y proceso de síntesis

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TOCH20150107001
Publicado:
06/07/2015
Caducidad:
05/07/2016
Resumen:
Un instituto de investigación suizo ha desarrollado un proceso de síntesis sencillo, de bajo coste, ecológico, rápido y escalable para elastómeros y polímeros basados en silicona de alta permitividad. Las áreas de aplicación incluyen actuadores, elastómeros, disposivos de rehabilitación y prótesis implantables, industria de automoción y aeronáutica, captura de energía, sensores táctiles, dispositivos ópticos, etc. Se buscan socios para fabricar los elastómeros a gran escala y desarrollar aplicaciones de actuadores de elastómero dieléctrico. El objetivo es establecer acuerdos de licencia y cooperación técnica.



Details

Tittle:
High permittivity silicone for dielectric elastomer actuators and its synthesis process offered for licensing and technical cooperation
Summary:
Swiss research institute developed a simple, low cost, eco-friendly, fast and easily up-scalable synthesis process for high permittivity silicone-based polymers and elastomers. Main application is in dielectric elastomer actuators and tactile sensors. Cooperation partner sought for large scale production of the elastomer and for application development of dielectric elastomer actuators. Types of cooperation: License agreement and/or technical cooperation agreement.
Description:
Background and need:
Dielectric elastomer actuators (DEA) are stretchable capacitors that consist of a thin elastomeric film sandwiched between two compliant electrodes.

When a voltage is applied, an electrostatic force is acting on the film, which is compressed. Since elastomers conserve their volume upon deformation, the film is elongated perpendicular to the applied electric field. This process is reversible; the polymer relaxes back to its original form after removal of the field. Common elastomers meet the mechanical requirements for actuators, however, they suffer from a low permittivity (e ').
Therefore high driving voltages are needed to induce mechanical work which hinders applications in, for example, medical prosthetics or make the electronics complex and expensive.

Synthesis process of high permittivity silicone elastomers:
A possible way to improve the performance is to increase e' of the elastomers. This is what the Swiss research Institute - active in material science and technology development - did. The Swiss research institute offers a low cost, simple and up-scalable synthesis process for (polar) high permittivity silicone elastomers with e' higher than 10 and excellent mechanical properties. The new materials allow the needed reduction of the driving voltage in the dielectric elastomer actuators as mentioned above.

See figure 1 - functioning of the DEA: the new material shows 20% strain at 10 V/µm.

Application areas of the high permittivity silicone elastomers:
The high permittivity silicone elastomers can be used as dielectricum in dielectric elastomer actuators (DEA) technologies. Due to DEA simple working principle and their excellent properties that include lightweight, quiet muscle like actuation, high actuation strain and electromechanical efficiency, their application potential is immense (see figure 2), especially if they have the advantages of the high permittivity silicone elastomer e.g.:
- actuators
- robotics
- implantable prosthetic and rehabilitation devices
- automotive and aeronautic industry
- energy harvesting
- sensors, and
- optical devices
- etc.

Other application areas:
Additionally, materials with high permittivity are also interesting for capacitors and transistors.

Cooperation:
Cooperation partners are sought for large scale production of the elastomer and for application development of the dielectric elastomer in actuation/tactile sensing applications.
In the first situation the Swiss research institute foresees a license agreement related to the synthesis process and in the second mainly a technical cooperation agreement (or other) depending on the cooperation partner and the application to be developed.
Advantages and Innovations:
The preparation of this high permittivity silicone elastomers with the offered synthesis process (and advantages of the materials):
- is straightforward and allows tuning the dielectrical as well as the mechanical properties of the resulting materials,
- leads to homogenous materials - in contrast to the commonly applied blending of higher permittivity phases into a silicone matrix,
- low cost: uses starting materials which are readily available and cheap, and
- is simple and up-scalable.

Comparing polar silicone and conventional PDMS (Polydimethylsiloxane):
Polar silicone outperforms conventional PDMS (a silicon-based polymer) in permittivity and mechanical properties as the table below - and figure 3 - shows:

Sample : Actuation @ 10 V/µm - e @ 103 Hz - Y [kPa]10% strain - Y [kPa] 20% strain
Polar silicone : 20 % - 10 - 150 - 125
PDMS : 0.5 % - 2.5 - 206 - 169

(Figure 3, if shown) Lateral actuation strain of membrane actuators for the new polar silicone and PDMS as function of applied electric field, showing that polar silicone outperforms PDMS.
Stage of Development:
Under development/lab tested
IPs:
Patent(s) applied for but not yet granted

Partner sought

Type and Role of Partner Sought:
The specific area of activity of the partner:
- Chemical Industry
- Automotive Industry
- Robotic Industry

The tasks to be performed by the partner sought:
- Produce silicones in large quantities
- Apply dielectric elastomer actuator in actuation/tactile sensing applications

Client

Type and Size of Client:
R&D Institution
Already Engaged in Trans-National Cooperation:
No
Languages Spoken:
English
French
German

Keywords

Technology Keywords:
01001001 Automatización, sistemas robóticos de control
02007016 Caucho
02009014 Electricidad y electrónica para automoción
01002002 Impresión 3D
03004010 Productos químicos especiales, productos intermedios