Improved Dielectric Tunability in Stretched P(VDF-DB)

Dielectric tunable materials have been widely used as various microwave devices, including varactors, phase shifters, and tunable resonators. Ferroelectric fluoropolymers show great potential in microwave tunable devices owing to their outstanding dielectric properties. However, the dielectric tunab...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2023-12, Vol.30 (6), p.2476-2481
Main Authors: Tan, Shaobo, Xi, Ziting, Li, Xinwei, Xiong, Jie, Wang, Xiao, Zhang, Zhicheng
Format: Article
Language:English
Subjects:
Ceramics
Chemicals
Copolymers
Dielectric properties
Dielectric tunability
Dielectrics
Electric fields
Ferroelectric materials
Ferroelectricity
fluoropolymer
Fluoropolymers
Nuclear magnetic resonance
Permittivity
Phase shifters
Phase transitions
Plastics
Polyvinylidene fluorides
Protons
relaxor ferroelectric (RFE) phase
Room temperature
stretching
Transition temperature
Vinylidene fluoride
X-ray scattering
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Summary:Dielectric tunable materials have been widely used as various microwave devices, including varactors, phase shifters, and tunable resonators. Ferroelectric fluoropolymers show great potential in microwave tunable devices owing to their outstanding dielectric properties. However, the dielectric tunability of fluoropolymers was rarely reported due to their low dielectric constant compared to ferroelectric ceramics. Herein, the effects of chemical structure and orientation on the conformation, crystal form, dielectric performances, and dielectric tunability of poly(vinylidene fluoride) bearing inner CF = CH double bond [P(VDF-DB)] were investigated. The resultant relaxor ferroelectric (RFE) copolymer exhibits large dielectric constant and tunability as a result of its phase transition temperature close to room temperature. A tunability of up to 73% was achieved in this stretched P(VDF-DB) at room temperature when a dc electric field of 100 MV/m was applied.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2023.3316636