scholarly journals Fabrication of Dielectric Elastomer Composites by Locking a Pre-Stretched Fibrous TPU Network in EVA

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1687 ◽  
Author(s):  
Liang Jiang ◽  
Yanfen Zhou ◽  
Yuhao Wang ◽  
Zhiqing Jiang ◽  
Fang Zhou ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Thermoplastic Polyurethane ◽  
Ethylene Vinyl Acetate ◽  
Tensile Tests ◽  
Dielectric Elastomer ◽  
Electromechanical Property ◽  
Electrical Breakdown Strength ◽  
Elastomer Composites

Dielectric elastomer (DE) composites with high electrical breakdown strength and large voltage-induced deformation were developed by retaining pre-stretched thermoplastic polyurethane (TPU) fibers in ethylene vinyl acetate copolymer (EVA). The microstructure of the candidate E-TPU fiber membrane and EVA coated E-TPU (E-TPU/EVA) film were characterized by scanning electron microscopy (SEM). The quasi-static and dynamic mechanical property, and the electromechanical properties, including the dielectric constant, dielectric loss tangent, and electromechanical sensitivity, of the DE composites were evaluated. Initially, tensile tests demonstrated that the DE composites based on E-TPU/EVAs had a higher elongation at break of above 1000% but a low elastic modulus of approximately 1.7 MPa. Furthermore, dielectric spectroscopy showed that the E-TPU/EVA had a dielectric constant of 4.5 at the frequency of 1000 Hz, which was 1.2 times higher than that of pure EVA film. Finally, it was found from electromechanical test that the voltage induced strain of E-TPU/EVA rose to 6%, nearly 3 times higher than that of pure TPU film, indicating an excellent electromechanical property. The DE composites developed have demonstrated the potential to be good candidate materials in the fields of artificial intelligence, biomimicry and renewable energy.

Development of Dielectric Elastomer Actuators - Part II: Preparation of the High Dielectric Constant Film Actuators Containing BaTiO3 Particles

2012 ◽  
Vol 557-559 ◽  
pp. 1869-1874 ◽  
Author(s):  
Takeshi Fukuda ◽  
Zhi Wei Luo ◽  
Aya Ito
Keyword(s):  
Particle Size ◽  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Volume Fraction ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Dielectric Elastomer ◽  
Dielectric Elastomer Actuators ◽  
Electrical Breakdown Strength ◽  
High Dielectric

Dielectric elastomer actuators with high dielectric constant and flexibility were prepared. These actuators were fabricated by the composite of barium titanate (BaTiO3) and polyester-type thermosetting polyurethane (TSU), which was molecularly-designed to become less hard segment content. In this study, the effects of particle size, volume fraction and manufacturing method of BaTiO3 were investigated. In addition, the mechanically-stretched effect in composites was also evaluated. It turned out that the electrical breakdown strength increased with the increase of particle size of BaTiO3 and in volume fraction as well as the use of BaTiO3 synthesized by the oxalate method. In addition, prestrain of composites also raised the electrical breakdown strength. However, the addition of BaTiO3 to polyurethane didn’t contribute to the actuation under a lower electric field.

The Effects of Moisture in Metal Oxide on the Mechanical and Electric Properties of Dielectric Elastomer Composites

2020 ◽  
Vol 981 ◽  
pp. 40-44
Author(s):  
Syed Muhammad Aiman Syed Mohd Hakhiri ◽  
Ahmad Farimin Ahmad Osman ◽  
Siti Noor Hidayah Mustapha ◽  
Lau Kwan Yiew ◽  
Shamsul Zakaria
Keyword(s):  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Metal Oxides ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Dielectric Elastomer ◽  
Pdms Film ◽  
Pdms Elastomer ◽  
Elastomer Composites ◽  
Major Factors

Dielectric elastomer (DE) technology are used in several applications for example generator, sensor and actuator. One of the major factors that limits the DE performance is premature electrical breakdown. Compositing is the example that have been reported to increase the breakdown strength. In this study polydimethylsiloxane (PDMS) film will be incorporated with two different fillers which are titanium dioxide (TiO2) and zinc oxide (ZnO). Both metal oxides will be calcined up to 300°C before they are added to the PDMS elastomer as fillers. The results show that the calcined TiO2 and ZnO that incorporated in PDMS films show significant increase of breakdown strengths. Meanwhile, the calcined TiO2 PDMS film give higher breakdown strength as comparison to the calcined ZnO counterpart.

scholarly journals The investigation of electrical properties and microstructure of ZnO-doped Ba0.9Sr0.1TiO3 ceramics

2017 ◽  
Vol 07 (01) ◽  
pp. 1750007 ◽  
Author(s):  
Gang Liu ◽  
Wentao Jiang ◽  
Jingyong Jiao ◽  
Li Liu ◽  
Ziyang Wang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Grain Size ◽  
Dielectric Properties ◽  
Solid State ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Xrd Analysis ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
Electrical Breakdown Strength

Ba[Formula: see text]Sr[Formula: see text]TiO3 ceramics with or without ZnO have been prepared by traditional solid state reaction method. The XRD analysis showed that the doped Zn[Formula: see text] ions diffused into the BST crystal lattice, resulting in the variation of dielectric properties. Especially the dielectric constant at Curie point decreased with doping ZnO content when it is lower than 0.5[Formula: see text]mol%. Due to the promotion of sintering, doping ZnO can enhance the density of ceramics but increase grain size. However, ZnO is a kind of semiconductor and can lead to the decrease in electrical breakdown strength value.

scholarly journals Recoverable Electrical Breakdown Strength and Dielectric Constant in Ultralow-k Nanolattice Capacitors

Nano Letters ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 5689-5696 ◽  
Author(s):  
Min-Woo Kim ◽  
Max L. Lifson ◽  
Gallivan A. Rebecca ◽  
Julia R. Greer ◽  
Bong-Joong Kim
Keyword(s):  
Dielectric Constant ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Electrical Breakdown Strength

Estimation of Elastic Modulus of Dielectric Elastomer Materials Using Mooney-Rivlin and Ogden Models

2013 ◽  
Vol 685 ◽  
pp. 331-335 ◽  
Author(s):  
Raj Kumar Sahu ◽  
Karali Patra
Keyword(s):  
Elastic Modulus ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Electric Energy ◽  
Dielectric Elastomer ◽  
Accurate Estimation ◽  
Electrical Breakdown Strength ◽  
High Specific Energy ◽  
Predicted Values ◽  
High Dielectric

Elastomers have low elastic modulus, high specific energy density, light weight, high dielectric constant and high electrical breakdown strength. Due to these properties, elastomers are currently recognized as the future materials for actuator technology and actuators based on these materials are known as dielectric elastomer actuators (DEA). Based on Maxwell stress principle, these actuators transform electric energy directly into mechanical work. Modeling large actuation of this material depends on accurate estimation of E-modulus which varies with strain. In this work, E-modulus values at different strain are estimated based Mooney-Rivlin & Ogden Models. The model predicted values of E-modulus are compared with experimentally estimated values of E-modulus and found to be in good agreement.

Development of Dielectric Elastomer Actuators - Part I: Performance of Polyurethane Film Actuators with Dangling Chains and Network Structures

2012 ◽  
Vol 557-559 ◽  
pp. 1852-1856 ◽  
Author(s):  
Takeshi Fukuda ◽  
Zhi Wei Luo ◽  
Aya Ito
Keyword(s):  
Electric Field ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Dielectric Elastomer ◽  
Toluene Diisocyanate ◽  
Polypropylene Glycol ◽  
Dielectric Elastomer Actuators ◽  
Polyurethane Film ◽  
Electrical Breakdown Strength ◽  
Lower Electric Field

Dielectric elastomer actuators with enhanced flexibility were prepared by thermosetting polyurethane (TSU) consisting of polypropylene glycol (PPG) as an active hydrogen component and toluene diisocyanate (TDI) as an isocyanate component. The improvement was achieved by less hard segment content, i.e. less isocyanate index, the synthesized film actuators were compared with the actuator softened using a plasticizer. It was found that the film actuators prepared by this method had significant advantages in actuation under a lower electric field as well as the increase of electrical breakdown strength and of strain. Furthermore, the mechanically-stretched effect of the films was also evaluated. It turned out that prestrain up to 200% was effective in the increase of electrical breakdown strength while maintaining the actuation under a lower electric field. However, prestrain over 200% caused a decrease in actuation under a lower electric field.

Stretch dependence of the electrical breakdown strength and dielectric constant of dielectric elastomers

2013 ◽  
Vol 22 (10) ◽  
pp. 104012 ◽  
Author(s):  
Andreas Tröls ◽  
Alexander Kogler ◽  
Richard Baumgartner ◽  
Rainer Kaltseis ◽  
Christoph Keplinger ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Dielectric Elastomers ◽  
Electrical Breakdown Strength

scholarly journals The thickness and stretch dependence of the electrical breakdown strength of an acrylic dielectric elastomer

2012 ◽  
Vol 101 (12) ◽  
pp. 122905 ◽  
Author(s):  
Jiangshui Huang ◽  
Samuel Shian ◽  
Roger M. Diebold ◽  
Zhigang Suo ◽  
David R. Clarke
Keyword(s):  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Dielectric Elastomer ◽  
Electrical Breakdown Strength

Electrical breakdown strength enhancement in aluminum scandium nitride through a compositionally modulated periodic multilayer structure

2021 ◽  
Vol 130 (14) ◽  
pp. 144101
Author(s):  
Jeffrey X. Zheng ◽  
Dixiong Wang ◽  
Pariasadat Musavigharavi ◽  
Merrilyn Mercy Adzo Fiagbenu ◽  
Deep Jariwala ◽  
...  
Keyword(s):  
Multilayer Structure ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Scandium Nitride ◽  
Strength Enhancement ◽  
Electrical Breakdown Strength
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