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Highly Efficient Piezoelectrets through Ultra-Soft Elastomeric Spacers

Piezoelectrets are artificial ferroelectrics that are produced from non-polar air-filled porous polymers by symmetry breaking through high-voltage-induced Paschen breakdown in air. A new strategy for three-layer polymer sandwiches is introduced by separating the electrical from the mechanical respon...

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Autores principales: von Seggern, Heinz, Zhukov, Sergey, Dali, Omar Ben, Hartmann, Claas, Sessler, Gerhard M., Kupnik, Mario
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8587960/
https://www.ncbi.nlm.nih.gov/pubmed/34771310
http://dx.doi.org/10.3390/polym13213751
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author von Seggern, Heinz
Zhukov, Sergey
Dali, Omar Ben
Hartmann, Claas
Sessler, Gerhard M.
Kupnik, Mario
author_facet von Seggern, Heinz
Zhukov, Sergey
Dali, Omar Ben
Hartmann, Claas
Sessler, Gerhard M.
Kupnik, Mario
author_sort von Seggern, Heinz
collection PubMed
description Piezoelectrets are artificial ferroelectrics that are produced from non-polar air-filled porous polymers by symmetry breaking through high-voltage-induced Paschen breakdown in air. A new strategy for three-layer polymer sandwiches is introduced by separating the electrical from the mechanical response. A 3D-printed grid of periodically spaced thermoplastic polyurethane (TPU) spacers and air channels was sandwiched between two thin fluoroethylene propylene (FEP) films. After corona charging, the air-filled sections acted as electroactive elements, while the ultra-soft TPU sections determined the mechanical stiffness. Due to the ultra-soft TPU sections, very high quasi-static (22,000 pC N(−1)) and dynamic (7500 pC N(−1)) [Formula: see text] coefficients were achieved. The isothermal stability of the [Formula: see text] coefficients showed a strong dependence on poling temperature. Furthermore, the thermally stimulated discharge currents revealed well-known instability of positive charge carriers in FEP, thereby offering the possibility of stabilization by high-temperature poling. The dependences of the dynamic [Formula: see text] coefficient on seismic mass and acceleration showed high coefficients, even at accelerations approaching that of gravity. An advanced analytical model rationalizes the magnitude of the obtained quasi-static [Formula: see text] coefficients of the suggested structure indicating a potential for further optimization.
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spelling pubmed-85879602021-11-13 Highly Efficient Piezoelectrets through Ultra-Soft Elastomeric Spacers von Seggern, Heinz Zhukov, Sergey Dali, Omar Ben Hartmann, Claas Sessler, Gerhard M. Kupnik, Mario Polymers (Basel) Article Piezoelectrets are artificial ferroelectrics that are produced from non-polar air-filled porous polymers by symmetry breaking through high-voltage-induced Paschen breakdown in air. A new strategy for three-layer polymer sandwiches is introduced by separating the electrical from the mechanical response. A 3D-printed grid of periodically spaced thermoplastic polyurethane (TPU) spacers and air channels was sandwiched between two thin fluoroethylene propylene (FEP) films. After corona charging, the air-filled sections acted as electroactive elements, while the ultra-soft TPU sections determined the mechanical stiffness. Due to the ultra-soft TPU sections, very high quasi-static (22,000 pC N(−1)) and dynamic (7500 pC N(−1)) [Formula: see text] coefficients were achieved. The isothermal stability of the [Formula: see text] coefficients showed a strong dependence on poling temperature. Furthermore, the thermally stimulated discharge currents revealed well-known instability of positive charge carriers in FEP, thereby offering the possibility of stabilization by high-temperature poling. The dependences of the dynamic [Formula: see text] coefficient on seismic mass and acceleration showed high coefficients, even at accelerations approaching that of gravity. An advanced analytical model rationalizes the magnitude of the obtained quasi-static [Formula: see text] coefficients of the suggested structure indicating a potential for further optimization. MDPI 2021-10-29 /pmc/articles/PMC8587960/ /pubmed/34771310 http://dx.doi.org/10.3390/polym13213751 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
von Seggern, Heinz
Zhukov, Sergey
Dali, Omar Ben
Hartmann, Claas
Sessler, Gerhard M.
Kupnik, Mario
Highly Efficient Piezoelectrets through Ultra-Soft Elastomeric Spacers
title Highly Efficient Piezoelectrets through Ultra-Soft Elastomeric Spacers
title_full Highly Efficient Piezoelectrets through Ultra-Soft Elastomeric Spacers
title_fullStr Highly Efficient Piezoelectrets through Ultra-Soft Elastomeric Spacers
title_full_unstemmed Highly Efficient Piezoelectrets through Ultra-Soft Elastomeric Spacers
title_short Highly Efficient Piezoelectrets through Ultra-Soft Elastomeric Spacers
title_sort highly efficient piezoelectrets through ultra-soft elastomeric spacers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8587960/
https://www.ncbi.nlm.nih.gov/pubmed/34771310
http://dx.doi.org/10.3390/polym13213751
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