Dielectric Elastomers: An Investigation in Strain Dependent Electrostatic Pressure of Soft Compliant Dielectric

Onyenucheya, Barnard; Allen, Jack; Pierre, K.; Zirnheld, J.; Burke, K.

doi:10.1109/ppps34859.2019.9009996

Cited by 3 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Orientational polarization is a common polarization mode in dielectric materials [ 33 ], and strain can induce orientational changes in TPU molecular chains [ 34 ]. The polarization ability and dielectric constant can be influenced by the formation of crystallization or orientation in the molecular chains under certain conditions [ 9 ]. To gain a deeper understanding of the orientation behavior of TPU during stretching, we used in situ WAXS to test the microstructure of TPU in different stretching states.…”

Section: Resultsmentioning

confidence: 99%

“…In the above scenario, dielectric elastomers typically need to operate while in deformation. Characterizing the dielectric properties during the strain process is not only beneficial for providing an important reference for improving the tensile stability of flexible capacitors [ 9 ] but also helps to improve the accuracy of modeling electrical parameters such as energy density and power density [ 10 , 11 ] for actuators under strain conditions. Due to the significant impact of different dielectric constants under strain on the electromechanical coupling of devices, studying the regulation of dielectric constants of dielectric elastomers under stress is crucial.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes

Wang,

Yang,

Xie

et al. 2024

Polymers

View full text Add to dashboard Cite

Dielectric elastomers, such as thermoplastic polyurethanes (TPUs), are widely used as the dielectric layer, encapsulation layer, and substrate of flexible and stretchable devices. To construct capacitors and actuators that work stably upon deformation, it has become urgent to investigate the evolution of dielectricity under stress and strain. However, the lack of effective methods for estimating the dielectric constant of elastomers under strain poses a big challenge. This study reports a device for the in situ measurement of the dielectric constant of TPU under strain. It is found that upon stretching TPU to a strain of 400%, its dielectric constant decreases from 8.02 ± 0.01 to 2.88 ± 0.25 (at 1 MHz). In addition, combined Fourier-transform infrared spectroscopy, the X-ray scattering technique, and atomic force microscopy were utilized to characterize the evolution of the microstructure under strain. The investigation under tensile strain reveals a decreased density and average size of polarized hard domains, along with a tendency of the molecular chains to align in parallel with the tensile stress. The evolution of the microstructures results in a reduction in the measured dielectric constant in TPU.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes

Wang,

Yang,

Xie

et al. 2024

Polymers

View full text Add to dashboard Cite

show abstract

“…The electric field established electrostatic pressure which is created pressure on the elastic sheet of DEAP that caused a compression of the elastomer sheet (Pelrine et al, 1998). The electric field dictate the electrostatic pressure (Onyenucheya et al, 2019). Thus, as voltage increased which mean electric field strength increases, the more stretches and reduces of the thickness of the elastomer sheet.…”

Section: Active Dynamic Characteristicmentioning

confidence: 99%

Electromechanical Characteristics of Core Free Folded Dielectric Electro-active Polymer Soft Actuator

Wahab¹,

Anuar²,

Hadi³

2021

JST

View full text Add to dashboard Cite

This paper investigates the active dynamic and electromechanical characteristics of a new thin folded dielectric electro-active polymer actuator developed by Danfoss PolyPower. The high voltage is supplied to the actuator during dynamic testing to identified the effect of the electrical field on dynamic characteristics. The electromechanical characteristics are investigated by varying the amplitude and frequency of the voltage supplied. The experimental results, such as natural frequency, amplitude response, and loss factor are presented to show the influence of such an electrical field on the characteristic of the actuator. There is a reduction of resonance frequency from 14 Hz to 12 Hz as voltage supply up to 2000 V. The actuating response of the actuator was subjected more to frequency rather than the amplitude of the voltage supplied. Hence, the results may guide the exploration of a new folded thin actuator as an active vibration controller.

show abstract

“…In the above scenario, dielectric elastomers typically need to operate while in deformation. Characterizing the dielectric properties during the strain process is not only beneficial for providing important reference for improving the tensile stability of flexible capacitors [9], but also helps to improve the accuracy of modeling electrical parameters such as energy density, power density [10,11] for actuators under strain conditions. Due to the significant impact of different dielectric constants under strain on the electromechanical coupling of devices, studying the regulation of dielectric constants of dielectric elastomers under stress is crucial.…”

Section: Introductionmentioning

confidence: 99%

Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes

Wang,

Yang,

Xie

et al. 2024

Preprint

View full text Add to dashboard Cite

Dielectric elastomers, such as thermoplastic polyurethanes (TPU), are widely used as dielectric layer, emulation layer and substrate of flexible and stretchable devices. To construct capacitors and actuators that work stably upon deformation, it has become an urgent need to investigate the evolution of dielectricity under stress and strain. However, the lack of effective methods for estimating the dielectric constant of elastomers under strain poses a big challenge. This article reports a device for in-situ measuring the dielectric constant of TPU under strain. It is found that upon stretching TPU to a strain of 400%, its dielectric constant decreases from 8.47 to 2.94. In addition, combined Fourier-transform infrared spectroscopy, X-ray scattering technique, and atomic force microscopy have been utilized to characterize the evolution of microstructure under strain. The investigation under tensile strain reveals that a decreased density and average size of polarized hard domains, along with a tendency of the molecular chains to align in parallel with the tensile stress. The evolution of the microstructures results in a reduction of the dielectric constant parallel to the electric field in TPU. Our work provides valuable experimental reference for improving the stability of flexible sensors and actuators based on dielectric elastomers.

show abstract

Dielectric Elastomers: An Investigation in Strain Dependent Electrostatic Pressure of Soft Compliant Dielectric

Cited by 3 publications

References 7 publications

Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes

Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes

Electromechanical Characteristics of Core Free Folded Dielectric Electro-active Polymer Soft Actuator

Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes

Contact Info

Product

Resources

About