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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Gerhard, Reimund
University of Potsdam
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2021Space-charge electret properties of polypropylene films with transcrystalline or spherulitic structurescitations
- 2021Tuning electro-mechanical properties of EAP-based haptic actuators by adjusting layer thickness and number of stacked layerscitations
- 2021Non-linear dielectric spectroscopy for detecting and evaluating structure-property relations in a P(VDF-TrFE-CFE) relaxor-ferroelectric terpolymercitations
- 2019Depth Profile and Transport of Positive and Negative Charge in Surface (2-D) and Bulk (3-D) Nanocomposite Filmscitations
- 2018Cellular polypropylene foam films as DC voltage insulation and as piezoelectretscitations
- 2018LDPE/MgO Nanocomposite Dielectrics for Electrical-Insulation and Ferroelectret-Transducer Applications
- 2017Novel high dielectric constant hybrid elastomers as candidates for dielectric elastomer actuators
- 2017Relaxation Processes Determining the Electret Stability of High-Impact Polystyrene/Titanium-Dioxide Composite Filmscitations
- 2016Glycerol as high-permittivity liquid filler in dielectric silicone elastomerscitations
- 2014Screen printing for producing ferroelectret systems with polymer-electret films and well-defined cavitiescitations
- 2011Characterization and calibration of piezoelectric polymers in situ measurements of body vibrationscitations
- 2011Enhancement of dielectric permittivity and electromechanical response in silicone elastomers molecular grafting of organic dipoles to the macromolecular Networkcitations
- 2010Enhanced Polarization in Melt-quenched and Stretched Poly(vinylidene Fluoride-Hexafluoropropylene) Filmscitations
- 2009Template-based fluoroethylenepropylene piezoelectrets with tubular channels for transducer applicationscitations
- 2008Cellular polyethylene-naphthalate films for ferroelectret applications: foaming, inflation and stretching, assessment of electromechanically relevant structural featurescitations
- 2006Relaxation processes at the glass transition in polyamide 11: From rigidity to viscoelasticitycitations
- 2006Novel heat durable electromechanical film : processing for electromechanical and electret applications
- 2006Thermal and temporal stability of ferroelectret films made from cellular polypropylene/air composites
- 2006Elastic properties and electromechanical coupling factor of inflated polypropylene ferroelectretscitations
- 2005Modeling electro-mechanical properties of layered electrets : application of the finite-element methodcitations
Places of action
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document
Elastic properties and electromechanical coupling factor of inflated polypropylene ferroelectrets
Abstract
Closed-cell polymer-foam electrets with internal bipolar charge exhibit strong longitudinal piezoelectricity. The size and the shape of their internal voids can be controlled by means of an inflation process that consists of a high-pressure treatment followed by a heat-setting procedure. Experimental data reveal a maximum of the piezoelectric coefficient and of the electromechanical coupling factor as functions of the polymer-foam density. These and related experimental results are discussed within a simplified model for polymer foams. The piezoelectric d33 coefficient and the respective coupling factor k33 are calculated by means of a series-connection model for cellular polymers. In the model, the piezoelectric coefficient and the coupling factor can be expressed in terms of the charge density on the respective void surface, the relative dielectric permittivity, the effective Young's modulus and the relative density of the foam. The effective Young's modulus is in turn determined by means of a truss-like mechanical model of the polymer foam. The model yields qualitative agreement with the experimentally observed data.