High k dielectric elastomeric materials for low voltage applications

Walder, Christian; Molberg, Martin; Opris, Dorina M.; Nüesch, Frank; Löwe, Christiane; Plummer, C. J. G.; Leterrier, Y.; Månson, J.‐A. E.

doi:10.1117/12.815926

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…As is possible to see from the image, no secondary transitions are present in the temperature working range. Similar results have been obtained by other authors and are present in literature [10].…”

Section: Acrylic Films Characterizationsupporting

confidence: 93%

Dielectric elastomer based active layer for macro-scaled industrial application in roto-flexographic printing

2014

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The use of dielectric elastomer (DE) for the realisation of new generation actuators has attracted the interest of many researchers in the last ten years due to their high efficiency, a very good electromechanical coupling and large achievable strains [1-3]. Although these properties constitute a very important advantage, the industrial exploitation of such systems is hindered by the high voltages required for the actuation [4] that could potentially constitute also a risk for the operators. In this work we present a DE based active layer that can be used in different macro-scaled parts of industrial equipment for roto-flexographic printing substituting traditional mechanical devices, reducing manufacturing costs and enhancing its reliability. Moreover, the specific configuration of the system requires the driving voltage to be applied only in the mounting/dismounting step thus lowering further the operative costs without posing any threat for the workers. Starting from the industrial requirements, a complete thermo-mechanical characterisation using DSC and DMA was undertaken on acrylic elastomer films in order to investigate their behaviour under the operative frequencies and solicitations. Validation of the active layer was experimentally evaluated by manufacturing a DE actuator controlling both prestrain and nature of the complaint electrodes, and measuring the electrically induced Maxwell strain using a laser vibrometer to evaluate the relative displacement along the z-axis.

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Section: Acrylic Films Characterizationsupporting

confidence: 93%

Dielectric elastomer based active layer for macro-scaled industrial application in roto-flexographic printing

2014

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“…Based on these general conclusions we concentrate our effort for future material development on silicone‐based materials. The effect of using different hardeners in various concentrations has been studied26 and first results for doped silicones show that further improvements can be made 27–29…”

Section: Discussionmentioning

confidence: 99%

A comparison between silicone and acrylic elastomers as dielectric materials in electroactive polymer actuators

Suéry

Zhang

Wissler

et al. 2009

Polymer International

215

154

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Soft elastomers, mostly silicones and acrylics, are interesting candidates as dielectric materials in electroactive polymer actuator technology. Generally, characteristics like large strain, high stress, high energy density, good efficiency and high response speed are required for actuator applications. However, some of these material properties may be contradictory. For this reason a comparison between Dow Corning silicone and 3M acrylic elastomers was made based on a set of six electromechanical tests for actuator applications. The silicone elastomer shows a fast electromechanical response (3 s) with good reproducibility and the dissipated work is negligible and not frequency dependent. It also shows a stable mechanical behaviour over a wide temperature range. In contrast, the acrylic elastomer shows a slow electromechanical response with poor reproducibility. The dissipated work of the acrylic elastomer is significant: a strong frequency and temperature dependency of the dissipated work is observed for this material. The Dow Corning silicone (DC 3481) is a better material for many applications, where activation strains of less than 10% are sufficient. However, in applications where higher strains are required, it might be obligatory to use acrylic elastomers, because only these have the potential for use with activation strains beyond 10%. The electrical activation of a circular specimen is most useful in order to evaluate a material as a dielectric in electroactive polymer actuators.

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“…However, a high volume fraction of ceramic is needed to obtain a significant increase in . In previous work 16 on composites of TPE and PZT powder prepared via a thermoplastic extrusion process, surprisingly little influence of the filler concentration was observed on the tensile modulus (a 10 to 15% increase in the elastic modulus at 100 % strain at the highest filler levels investigated of 81 wt%). This encouraging result led to further investigations of the use of these materials as dielectric elastomers.…”

Section: Resultsmentioning

confidence: 84%

Elastomer actuators: systematic improvement in properties by use of composite materials

Molberg

Leterrier

Plummer

et al. 2010

Electroactive Polymer Actuators and Devices (EAPAD) 2010

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Dielectric elastomer actuators (DEAs) have attracted increasing attention over the last few years owing to their outstanding properties, e.g. their large actuation strains, high energy density, and pliability, which have opened up a wide spectrum of potential applications in fields ranging from microengineering to medical prosthetics. There is consequently a huge demand for new elastomer materials with improved properties to enhance the performance of DEAs and to overcome the limitations associated with currently available materials, such as the need for high activation voltages and the poor long-term stability. The electrostatic pressure that activates dielectric elastomers can be increased by higher permittivity of the elastomer and thus may lead to lower activation voltages. This has led us to consider composite elastomeric dielectrics based on thermoplastic elastomers or PDMS, and conductive polyaniline or ceramic (soft doped PZT) powder fillers. The potential of such materials and strategies to counter the adverse effects of increased conductivity and elastic modulus are discussed.

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High k dielectric elastomeric materials for low voltage applications

Cited by 7 publications

References 6 publications

Dielectric elastomer based active layer for macro-scaled industrial application in roto-flexographic printing

Dielectric elastomer based active layer for macro-scaled industrial application in roto-flexographic printing

A comparison between silicone and acrylic elastomers as dielectric materials in electroactive polymer actuators

Elastomer actuators: systematic improvement in properties by use of composite materials

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