Effects of transitional phenomena on the electric field induced strain-electrostrictive response of a segmented polyurethane elastomer

Su, Ji; Zhang, Q. M.; Kim, C. H.; Ting, Robert Y.; Capps, Rodger N.

doi:10.1002/(sici)1097-4628(19970815)65:7<1363::aid-app14>3.0.co;2-w

Cited by 50 publications

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“…Tremendous amounts of research and development have led to Electroactive Polymers (EAP) that can change in size or shape when stimulated by an external electrical field, meaning they can convert electrical energy into mechanical energy [1]. Among the various EAPs, polyurethane (PU) elastomers are of great interest due to the significant electrical-field strains [2,3,4], and due to their attractive and useful properties, such as abrasion resistance, high mechanical strength and biocompatibility with blood and tissues [5]. The PU elastomers studied here are block copolymers of soft and hard segments (SS and HS).…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of segmented polyurethanes for electromechanical applications

Jomaa

Seveyrat

Lebrun

et al. 2015

Polymer

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Please cite this article as: Jomaa MH, Seveyrat L, Lebrun L, Masenelli-Varlot K, Cavaille JY, Dielectric properties of segmented polyurethanes for electromechanical applications, Polymer (2015), AbstractThe paper deals with electromechanical and dielectric properties of polyurethanes (PU) blockcopolymers. Most of the works published in the literature only consider electrostriction at room temperature at a given frequency. In this work, it is shown that electrostrictive coefficient M E is divided by 3 to 10 at increasing frequency over 3 decades of frequency, depending on the ratio of hard to soft segments in PU. Thus it is important to analyze the energy conversion efficiency by investigating the dielectric and viscoelastic properties. This work is divided into two parts. The first oneThis work deals with the study of dielectric properties of 3 PU with different fractions of hard segments. Three relaxation phenomena (β, α and conduction) were investigated for each PU in the temperature-frequency range studied here, in order to optimize the copolymer composition in view of their best efficiency as actuators or mechanical energy harvesting devices. Part 2 will analyze the effect of viscoelastic properties on electrostriction efficiency.

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Section: Introductionmentioning

confidence: 99%

Dielectric properties of segmented polyurethanes for electromechanical applications

Jomaa

Seveyrat

Lebrun

et al. 2015

Polymer

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“…The resonance frequency of the diaphragm is estimated to he 4 kHz, and no marked peak is observed in the frequency range examined, although a small peak is found at 550Hz, The rapid decrease of the deformation at very low frequency can be explained by the frequency dependence of the electric field induced strain, which is especially found in high dielectric material. It was suggested that the strain induced by the electric field decreases when the driving frequency increases [6]. According to the phase lag, the absolute value monotonically increases with the frequency, and becomes about 0.611 at 2kHz.…”

Section: ( 3 )mentioning

confidence: 99%

Micro electrostrictive actuator with metal compliant electrodes for flow control applications

Pimpin¹,

Suzuki²,

Kasagi³

17th IEEE International Conference on Micro Electro Mechanical Systems. Maastricht MEMS 2004 Technical Digest

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A micro synthetic jet actuator driven by electrostrictive diaphragm actuator was developed for flow control applications. Metal concentric ring electrodes were employed in order to obtain large out-of-plane deformation.It is found that the deformation strongly depends on the gap/width ratio of the ring electrode. The maximum deformation for 2m-diameter actuators is as large as 3 0 p , which is 3 times larger than that of the plain metal electrode actuator. A prototype synthetic jet actuator was fabricated by using the present electrostrictive actuator, and the jet flow issued from a 0.5mm orifice was visualized.

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“…The reason why the gain drops at very small frequencies remains unclear, but slow charge injection [27] or viscoelastic losses [19] might be the cause.…”

Section: B Dynamic Responsementioning

confidence: 99%

Microelectrostrictive Actuator With Large Out-of-Plane Deformation for Flow-Control Application

Pimpin

Suzuki

Kasagi

2007

J. Microelectromech. Syst.

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We have established methods for the design and fabrication of a novel MEMS actuator for flow control based on the electrostrictive principle. Patterned metal electrodes were employed in order to obtain large out-of-plane deformation. A series of finite-element method (FEM) analyses of the electrical and strain fields was performed in order to optimize the design parameters. The maximum deformation for 2-mm-diameter actuators reaches 112 µm, which is 5.6% of the actuator diameter and six times larger than that of the plain metal-electrode actuator. The elastic energy density reaches 29% of the stored electrostatic energy. The power consumption at the driving frequency of 100 Hz is estimated to be on the order of 100 µW. The present electrostrictive actuator has a fast response, and its operating frequency is up to several kilohertz. A synthetic jet issuing from a 0.4-mm orifice is successfully developed using the present electrostrictive actuator, and this demonstrates the viability of the present actuator in active flow control.[ 2006-1762]Index Terms-Electrostrictive polymer, finite-element method (FEM) analysis, out-of-plane deformation, patterned metal electrode, synthetic jet.

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Effects of transitional phenomena on the electric field induced strain-electrostrictive response of a segmented polyurethane elastomer

Cited by 50 publications

References 0 publications

Dielectric properties of segmented polyurethanes for electromechanical applications

Dielectric properties of segmented polyurethanes for electromechanical applications

Micro electrostrictive actuator with metal compliant electrodes for flow control applications

Microelectrostrictive Actuator With Large Out-of-Plane Deformation for Flow-Control Application

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