Relationship between surface potential and d33 constant in cellular piezoelectric polymers
| Autor: | Marcos Domínguez-Lagunilla, Gustavo Ortega-Braña, Pedro Llovera-Segovia, Alfredo Quijano-Lopez |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Work (thermodynamics)
Piezoelectric coefficient Materials science Piezoelectric sensor Analytical chemistry 02 engineering and technology 01 natural sciences Molecular physics Electric field 0103 physical sciences Polymer foams d33 constant Piezoelectrics Corona discharge Electrical and Electronic Engineering 010302 applied physics Charge density 021001 nanoscience & nanotechnology Condensed Matter Physics Piezoelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Dipole INGENIERIA ELECTRICA 0210 nano-technology Biotechnology |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| DOI: | 10.1016/j.elstat.2016.12.014 |
| Popis: | The development of cellular piezoelectric polymers has shown very promising results thanks to their high d 33 piezoelectric constants which make them candidates for many applications. Cellular piezoelectric polymers, known as ferroelectrets, are obtained by means of an activation process which consists in generating an internal dipole with electrostatic charges produced by internal electric discharges. The most common system for this activation process is the application of a corona discharge on the surface of the sample in order to produce a high internal electric field. The theoretical electrostatic model of the process which is widely used is the Sessler model which relates the internal surface charge density, the air and polymer layers thickness, the dielectric permittivity of the polymer and the Young's Modulus of the cellular material to the d 33 piezoelectric constant. In our work, we relate the internal charges of the material with the d 33 piezoelectric constant by means of a surface potential scanning of cellular polypropylene biaxially stretched samples. Samples were charged by a corona discharge controlled with a triode electrode. Surface potentials were high enough to generate internal discharges and obtain measurable d 33 piezoelectric constants but low enough to be measured with spatial resolution by means of a 3 kV electrostatic probe. Surface potential profiles showed some deviations from the expected bell-shape profile due to the internal electric field generated by the internal static charge. These deviations can be numerically related to the measured d 33 piezoelectric constant with the electrostatic Sessler model. |
| Databáze: | OpenAIRE |
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