EFFECT OF EXTRUSION PROCESS AND VARIOUS ELONGATION RATIOS ON THE STRUCTURAL AND DIELECTRIC PROPERTIES OF PVDF-BASED COPOLYMER CONTAINING MICRO AND NANO-SIZED CRYSTALLITES

1 MRLÍK Miroslav
Co-authors:
1 Cvek Martin 1 OSIČKA Josef 2 MASLOWSKI Marcin 3 TOFEL Pavel
Institutions:
1 Tomas Bata University in Zlín, University Institute, Centre of Polymer Systems, Zlín, Czech Republic, EU, mrlik@utb.cz
2 Lodz University of Technology, Institute of Polymer and Dye Technology, Lodz, Poland, EU
3 Brno University of Technology, Department of Physics, Faculty of Electrical Engineering and Communication, Brno, Czech Republic, EU
Conference:
12th International Conference on Nanomaterials - Research & Application, Brno, Czech Republic, EU, October 21 - 23, 2020
Proceedings:
Proceedings 12th International Conference on Nanomaterials - Research & Application
Pages:
127-132
ISBN:
978-80-87294-98-7
ISSN:
2694-930X
Published:
28th December 2020
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
330 views / 156 downloads
Abstract

In this contribution, the effect of the extrusion process of the poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) with the subsequent elongation/poling on its structural and dielectric properties is presented. The extrusion can be understood as continuous processing of polymer melts in the large scale (in comparison to solvent casting), when the thickness of the final product can be varied depending on the final operation conditions. Herein, the PVDF-co-HFP sheets of 5 cm in width were extruded using a single screw extruder. The fabricated sheets were cooled down and then, they were cut to the stripes and subsequently stretched to various elongations (100, 200 and 500 %) using a universal tensile testing machine. Such samples were investigated using FTIR in order to determine the effect of the elongation process on the transformation of the α-phase to the β-crystalline phase. The extend of the electro-active β-phase was quantified and its impact on the dielectric properties was investigated. The results clearly demonstrated that the elongation has a crucial effect on the final dielectric properties of the PVDF-co-HFP.

Keywords: Poly(vinylidene fluoride), poly(vinylidene fluoride-co-hexafluoropropylene), extrusion, dielectric properties, electromechanical coupling

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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