| People | Locations | Statistics |
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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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article
Cellular polyethylene-naphthalate films for ferroelectret applications: foaming, inflation and stretching, assessment of electromechanically relevant structural features
Abstract
<jats:title>Abstract</jats:title><jats:p>Cellular polymer films are frequently employed for packaging, insulation, and printing. They can also be used as ferroelectrets in transducer applications. Here, we propose a preparation process for cellular polyethylene-naphthalate (PEN) films with the following steps: (1) foaming by means of supercritical carbon dioxide (CO<jats:sub>2</jats:sub>), (2) controlled inflation through gas diffusion and expansion, and (3) biaxial stretching. We describe and assess the cellular structure that is formed under suitable processing conditions. For foaming, the PEN films are saturated with supercritical CO<jats:sub>2</jats:sub> at room temperature for a few hours, at a pressure as high as 100 bar. The subsequent temperature treatment is very critical for controlling the sample density. Additional inflation can improve the cellular geometry and higher stabilization temperatures during the inflation process cause stronger inflation and thus lower densities. Stretching may be employed in order to achieve a regular cellular structure with lens-like voids. High electromechanical responses, i.e. large piezoelectric thickness coefficients are found only on samples within the proper density range and with optimal cellular structures</jats:p>