Eliminating the Misconceptions Regarding the Usage of Commercially Available Silicone Elastomers in Thin Film Actuators

Author:

Fukui Hiroshi1ORCID,Akasaka Masayasu1,Kishimoto Norihisa1,Tsuda Takeaki2,Sasaki Kaito3

Affiliation:

1. Dow Toray Company, Ltd. Chigusa‐Kaigan 2‐2 Ichihara 299‐0108 Japan

2. Kanazawa University Kakuma Kanazawa 920‐1192 Japan

3. Tokai University Kitakaname 4‐1‐1 Hiratsuka 259‐1292 Japan

Abstract

Dielectric elastomers (DEs) are actively being studied to develop soft transducers including DE actuators (DEAs). Poly(dimethylsiloxane) is a popular elastomer component and known for yielding a relatively low dielectric constant (ε′) for DEAs. Herein, a novel polysiloxane‐based DE, namely, DOWSIL ME 7540 Electroactive Elastomer is reported, offering ε′ = 5.2–5.5 over a broad frequency range that is nearly two times as high as that for commercially popular SYLGARD 184 Silicone Elastomer as a comparative DE. Weibull analysis is useful for statistically evaluating dielectric strength (DS). ME 7540 DE attains DS = 63.8 V μm−1, which is only 16% lower than DS = 75.7 V μm−1 obtained with 184 DE. The material parameters obtained by fitting uniaxial extension results with the Yeoh model are used to simulate an equibiaxial stress–stretch ratio (λib) curve, with i = 1 or 2, and the relationship between voltage and λ1b. Simulation and actuation experiments confirm that ME 7540 DE performs better than 184 DE over one million cycles. With these advantages, ME 7540 DE will help accelerate not only fundamental studies but also developments in real‐life applications in the DEA field.

Publisher

Wiley

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