Ice-templated poly(vinylidene fluoride) ferroelectrets

Abstract : Ferroelectrets are piezoelectrically-active polymer foams that can convert externally applied loads into electric charge. Existing processing routes used to create pores of the desired geometry and degree of alignment appropriate for ferroelectrets are based on complex mechanical stretching and chemical dissolution steps. As a simple, cost effective and environmentally friendly approach, freeze casting is able to produce aligned pores with almost all types of the materials, including polymers. In this work, we present the first demonstration of freeze casting to create polymeric ferroelectrets. The pore morphology, phase analysis, relative permittivity and direct piezoelectric charge coefficient (d33) of porous poly(vinylidene fluoride (PVDF) ferroelectrets with porosity volume fractions ranging from 24% to 78% were analysed. The long-range alignment of pore channels produced during directional freezing was shown to be beneficial in forming a highly polarised structure after breakdown of air in the pore channels via corona poling. This new method opens a way to create tailored pores and voids in ferroelectret materials for transducer applications related to sensors and vibration energy harvesting.
Type de document :
Pré-publication, Document de travail
2018
Domaine :
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https://hal.archives-ouvertes.fr/hal-01859339
Contributeur : Sylvain Deville <>
Soumis le : mercredi 22 août 2018 - 08:55:47
Dernière modification le : jeudi 23 août 2018 - 01:00:23
Document(s) archivé(s) le : vendredi 23 novembre 2018 - 14:36:38

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  • HAL Id : hal-01859339, version 1

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Yan Zhang, Chris Bowen, Sylvain Deville. Ice-templated poly(vinylidene fluoride) ferroelectrets. 2018. 〈hal-01859339〉

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