Soft Polydimethylsiloxane Thin Elastomeric Films by In Situ Polymerization to be Used as Dielectricum in Actuators

Cîrcu, Monica; Ko, Yee Song; Gerecke, Andreas C.; Opris, Dorina M.

doi:10.1002/mame.201300457

Cited by 11 publications

(13 citation statements)

References 34 publications

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“…Reducing thickness of a dielectric film is highly attractive as the actuation strain increases inversely proportional to the square of the thickness . Thin films can be prepared by spin coating, doctor blading, sputtering, melt pressing, printing, or electro‐spraying . However, for large‐scale production, reducing the thickness of films below 10 µm turned out to be rather challenging .…”

Section: Thin Film Formationmentioning

confidence: 99%

Polar Elastomers as Novel Materials for Electromechanical Actuator Applications

2017

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Dielectric elastomer actuators are stretchable capacitors capable of a musclelike actuation when charged. They will one day be used to replace malfunctioning muscles supposing the driving voltage can be reduced below 24 V. This focus here is on polar dielectric elastomers and their behavior under an electric field. Emphasis is placed on all the features that are correlated with the molecular structure, its synthetic realization, and its impact on properties. Regarding the polymer class, the focus, to some degree, is on polysiloxanes because of their attractively low glass transition temperatures. This enables introduction of highly polar groups to the backbone while maintaining soft elastic properties. The goal is to provide a few guidelines for future research in this emerging field that may be useful for those considering entering this fascinating endeavor. Because of the large number of materials available, a few restrictions in the selection have to be applied.

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Section: Thin Film Formationmentioning

confidence: 99%

Polar Elastomers as Novel Materials for Electromechanical Actuator Applications

2017

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“…As can be seen from Eq. (1), to maintain a given actuation strain while decreasing the voltage, either ε must be increased [9,14], or Y m and t m must be decreased [15,16]. The strain-to-voltage-squared ratio (S x /V 2 ) metric has been used to compare the performance of DEAs with different operating voltages [16].…”

Section: Introductionmentioning

confidence: 99%

Stretchable composite monolayer electrodes for low voltage dielectric elastomer actuators

Haitami

Sorba

et al. 2018

Sensors and Actuators B: Chemical

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In this work, a Multiwalled Carbon Nanotube/poly(alkylthiophene) (MWCNT/PT) composite is developed as the electrodes for dielectric elastomer actuators (DEAs) using the Langmuir-Schaefer (LS) method. These composites form stable monolayers at the air-water interface that can then be LS transferred onto a poly(dimethylsiloxane) (PDMS) elastomer membrane. The monolayer electrode remains conductive up to 100% uniaxial strain. We present a method to fabricate DEAs using the LS transferred electrodes. By using a mask during the transfer step, the electrodes can be patterned with better than 200 m resolution on both sides of a 1.4 m-thick pre-stretched PDMS membrane to produce an ultra-low voltage DEA. The DEA generates 4.0% linear strain at an actuation voltage of 100 V, an order of magnitude lower than the typical DEA operating voltage.

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“…[ 3 ] Thus, the driving voltage can be reduced by optimizing two material parameters: reducing Y and increasing ε′. [ 5 ] Elastomers with low Y can be prepared by reducing the cross-link density [ 6 ] or by adding a softener. [ 7 ] The reduction of Y increases the actuation strain but results in soft materials that have poor mechanical robustness and low output stress.…”

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Self‐Repairable, High Permittivity Dielectric Elastomers with Large Actuation Strains at Low Electric Fields

Dünki

Nüesch

et al. 2015

Adv Funct Materials

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156

139

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A one‐step process for the synthesis of elastomers with high permittivity, excellent mechanical properties and increased electromechanical sensitivity is presented. It starts from a high molecular weight polymethylvinylsiloxane, P1, whose vinyl groups serve two functions: the introduction of polar nitrile moieties by reacting P1 with 3‐mercaptopropionitrile (1) and the introduction of cross‐links to fine tune mechanical properties by reacting P1 with 2,2′‐(ethylenedioxy)diethanethiol (2). This twofold chemical modification furnished a material, C2, with a powerful combination of properties: permittivity of up to 10.1 at 104 Hz, elastic modulus Y10% = 154 kPa, and strain at break of 260%. Actuators made of C2 show lateral actuation strains of 20.5% at an electric field as low as 10.8 V μm–1. Additionally, such actuators can self‐repair after a breakdown, which is essential for an improved device lifetime and an attractive reliability. The actuators can be operated repeatedly and reversibly at voltages below the first breakdown. Due to the low actuation voltage and the large actuation strain applications of this material in commercial products might become reality.

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Soft Polydimethylsiloxane Thin Elastomeric Films by In Situ Polymerization to be Used as Dielectricum in Actuators

Cited by 11 publications

References 34 publications

Polar Elastomers as Novel Materials for Electromechanical Actuator Applications

Polar Elastomers as Novel Materials for Electromechanical Actuator Applications

Stretchable composite monolayer electrodes for low voltage dielectric elastomer actuators

Self‐Repairable, High Permittivity Dielectric Elastomers with Large Actuation Strains at Low Electric Fields

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