Large, Fast, and Bidirectional Bending of Slide‐Ring Polymer Materials

Kakizaki, Sho; Shintake, Jun; Iwatake, Yasunori; Baba, Kazumasa; Takeuchi, Hiromitsu; Yamamoto, Akio

doi:10.1002/aisy.201900155

Cited by 8 publications

(6 citation statements)

References 26 publications

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“…Charge accumulation modifies the electric field distribution inside the membrane and thus influences actuation strain. It has been shown that space charge accumulation in SRM occurs over a timescale of 10 s of seconds, but also shows long-term evolution on the order of hours [47]. This is consistent with the timescale of the drift in strain between positive and negative polarity that we observed during each high phase.…”

Section: Srm Deassupporting

confidence: 90%

“…The DEAs tested at FP all failed due to dielectric breakdown, while those tested at AP all failed due to electrode degradation (see figure S7). We hypothesize that, under FP, premature breakdown of the SRM membranes occurs as a result of charge accumulation, which is known to occur in SRM [47]. Charge accumulation leads to electric field concentrations that can cause partial breakdown at the membraneelectrode interface, thus contributing to degradation of the dielectric.…”

Section: Srm Deasmentioning

confidence: 99%

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Automated test setup to quantify the lifetime of dielectric elastomer actuators under a wide range of operating conditions

Kühnel¹,

Albuquerque²,

Py³

et al. 2021

Smart Mater. Struct.

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We present an automated test setup for the systematic performance and lifetime evaluation of dielectric elastomer actuators (DEAs). This setup, called the MAPLE setup, performs accelerated aging tests and allows quantifying how material choice, fabrication methods, voltage waveform, and environmental conditions influence DEA lifetime, an important step for commercial use of DEAs. The setup continuously monitors strain and electrode resistance of multiple DEAs under a wide range of environmental conditions (up to 85 °C and 85% relative humidity), with automatic breakdown detection to record device lifetime. To illustrate a use case, we investigate the lifetime of DEAs made of two different elastomer materials, comparing fixed polarity (FP) vs. periodically reversing the polarity of the actuation voltage. For DEAs made from a slide-ring material, lifetime improvements around 10× were observed at alternating polarity compared to FP. For DEAs made from silicone rubber, no improvement in lifetime was observed. This indicates that different degradation mechanisms are causing failure in the two materials.

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Section: Srm Deassupporting

confidence: 90%

Section: Srm Deasmentioning

confidence: 99%

Automated test setup to quantify the lifetime of dielectric elastomer actuators under a wide range of operating conditions

Kühnel¹,

Albuquerque²,

Py³

et al. 2021

Smart Mater. Struct.

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“…In our previous work, an SRM-DEA was found to exhibit 5% actuation strain at 20 V µm −1 [30]. Kakizaki et al have revealed that SRMs in a specific composition generates a large bending actuation with fast response time (180 • achieved within 0.4 s) [31]. Kühnel et al have investigated the lifetime of SRM-DEAs under a wider range of environmental conditions (up to 85 • C and 85% RH) [32].…”

Section: Introductionmentioning

confidence: 98%

Characterization of slide ring materials for dielectric elastomer actuators

Shintake

Matsuno

Baba

et al. 2022

Smart Mater. Struct.

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This paper investigates the characteristics of sliding ring materials (SRMs), which are promising elastomeric materials for dielectric elastomer actuators (DEAs). Two different types of SRMs with Young's modulus of 0.8 MPa and 3.3 MPa, respectively, are prepared, and their material and mechanical properties and electro-mechanical performances at electric fields of up to 30 V/um are characterized. For comparison, the same tests are also performed on several commercially available elastomers: Elastosil 2030, Ecoflex 00-30, CF19-2186, and VHB 4905. The results reveal that SRMs demonstrate negligible Mullins effect and hysteresis, while their dielectric strength (62.4‒112.4 V/µm) and viscoelasticity (tan⁡δ 0.07‒0.24 at 10 Hz) are comparable or even superior to those of other elastomers. In addition, elongation at break is found to be 163.8‒172.1%. SRMs exhibit excellent electro-mechanical performance; for instance, one of the two types has an actuation force 293.2 mN at 24.9 V/µm and a strain of 5.2% at 22.3 V/µm. These values are the largest or larger than most of the tested elastomers. The high performance of SRMs results from their dielectric constant, which ranges from 10.3‒13.4, leading to an electro-mechanical sensitivity of up to 15.3 MPa-1. These results illustrate SRMs as attractive material options for DEAs.

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“…In general, shape memory materials are promising due to their ability to store and relax back their elastic energy when triggered by several external stimuli such as heat, light, electricity, and magnetic fields. − The ability to change shape is useful for designing structures to fulfill various demands such as functionality, durability, and shape conformability. − Among various materials, soft and stretchable shape memory composites with electrical conductivity are potentially useful for unconventional electronics such as stretchable displays, , soft robotics, − and wearable sensors. − …”

Section: Introductionmentioning

confidence: 99%

Soft and Stretchable Liquid Metal Composites with Shape Memory and Healable Conductivity

Bhuyan

Wei

Sin

et al. 2021

ACS Appl. Mater. Interfaces

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Shape memory composites are fascinating materials with the ability to preserve deformed shapes that recover when triggered by certain external stimuli. Although elastomers are not inherently shape memory materials, the inclusion of phase-change materials within the elastomer can impart shape memory properties. When this filler changes the phase from liquid to solid, the effective modulus of the polymer increases significantly, enabling stiffness tuning. Using gallium, a metal with a low melting point (29.8 °C), it is possible to create elastomeric materials with metallic conductivity and shape memory properties. This concept has been used previously in core–shell (gallium-elastomer) fibers and foams, but here, we show that it can also be implemented in elastomeric films containing microchannels. Such microchannels are appealing because it is possible to control the geometry of the filler and create metallically conductive circuits. Stretching the solidified metal fractures the fillers; however, they can heal by body heat to restore conductivity. Such conductive, shape memory sheets with healable conductivity may find applications in stretchable electronics and soft robotics.

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Large, Fast, and Bidirectional Bending of Slide‐Ring Polymer Materials

Cited by 8 publications

References 26 publications

Automated test setup to quantify the lifetime of dielectric elastomer actuators under a wide range of operating conditions

Automated test setup to quantify the lifetime of dielectric elastomer actuators under a wide range of operating conditions

Characterization of slide ring materials for dielectric elastomer actuators

Soft and Stretchable Liquid Metal Composites with Shape Memory and Healable Conductivity

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