scholarly journals Effects of Sub-Micro Sized BaTiO3 Blocking Particles and Ag-Deposited Nano-Sized BaTiO3 Hybrid Particles on Dielectric Properties of Poly(vinylidene-fluoride) Polymer

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3641
Author(s):  
Kanyapak Silakaew ◽  
Prasit Thongbai
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Loss Tangent ◽  
Vinylidene Fluoride ◽  
Interfacial Polarization ◽  
Blocking Effect ◽  
Alternative Route ◽  
Hybrid Particles ◽  
High Permittivity ◽  
Poly Vinylidene Fluoride

This work provided an alternative route to balance the significantly increased dielectric permittivity (ε′) and effectively retained tanδ using an effective two-step concept. Ag-deposited nano-sized BaTiO3 (Ag-nBT) hybrid particle was used as the first filler to increase the ε′ of the poly(vinylidene-fluoride) (PVDF) polymer via the strong interfacial polarization and a high permittivity of nBT and suppress the increased loss tangent (tanδ) owing to the discrete growth of Ag nanoparticles on the surface of nBT, preventing a continuous percolating path. The ε′ and tanδ values at 103 Hz of the Ag-nBT/PVDF composite with fAg-nBT~0.29 were 61.7 and 0.036. The sub-micron-sized BaTiO3 (μBT) particle was selected as the blocking particles to doubly reduce the tanδ with simultaneously enhanced ε′ due to the presence of the tetragonal BT phase. The μBT blocking particles can effectively further inhibit the formation of conducting network and hence further reducing tanδ. By incorporation of μBT clocking particles with fμBT = 0.2, the ε′ value of the Ag-nBT/PVDF-μBT composite (fAg-nBT = 0.30) can significantly increase to 161.4, while the tanδ was reduced to 0.026. Furthermore, the tanδ was lower than 0.09 in the temperature range of −60–150 °C due to the blocking effect of μBT particles.

scholarly journals Suppressing loss tangent with significantly enhanced dielectric permittivity of poly(vinylidene fluoride) by filling with Au–Na1/2Y1/2Cu3Ti4O12 hybrid particles

RSC Advances ◽  
2020 ◽  
Vol 10 (66) ◽  
pp. 40442-40449
Author(s):  
Pornsawan Kum-onsa ◽  
Nutthakritta Phromviyo ◽  
Prasit Thongbai
Keyword(s):  
Dielectric Permittivity ◽  
Gold Nanoparticle ◽  
Loss Tangent ◽  
Vinylidene Fluoride ◽  
Hybrid Particles ◽  
Particle Volume ◽  
Hybrid Particle ◽  
Volume Fractions ◽  
Three Phase ◽  
Poly Vinylidene Fluoride

Three-phase gold nanoparticle–Na1/2Y1/2Cu3Ti4O12 (Au–NYCTO)/poly(vinylidene fluoride) (PVDF) composites with 0.095–0.487 hybrid particle volume fractions (f) were fabricated.

scholarly journals Greatly enhanced dielectric permittivity in La1.7Sr0.3NiO4/poly(vinylidene fluoride) nanocomposites that retained a low loss tangent

RSC Advances ◽  
2017 ◽  
Vol 7 (28) ◽  
pp. 17128-17136 ◽  
Author(s):  
Keerati Meeporn ◽  
Prasit Thongbai ◽  
Teerapon Yamwong ◽  
Santi Maensiri
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Loss Tangent ◽  
Polyvinylidene Fluoride ◽  
Vinylidene Fluoride ◽  
Low Loss ◽  
Poly Vinylidene Fluoride

The effect of La1.7Sr0.3NiO4 nanoparticles (LSNO-NPs) on the dielectric properties of LSNO-NPs/polyvinylidene fluoride (LSNO-NPs/PVDF) composites is presented.

scholarly journals High Electromechanical Deformation Based on Structural Beta-Phase Content and Electrostrictive Properties of Electrospun Poly(vinylidene fluoride- hexafluoropropylene) Nanofibers

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1817 ◽  
Author(s):  
Nikruesong Tohluebaji ◽  
Chatchai Putson ◽  
Nantakan Muensit
Keyword(s):  
Dielectric Properties ◽  
Smart Materials ◽  
Microelectromechanical Systems ◽  
Vinylidene Fluoride ◽  
Interfacial Polarization ◽  
Surface Charges ◽  
Thermal Compression ◽  
Β Phase ◽  
Interfacial Surface ◽  
Poly Vinylidene Fluoride

The poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) polymer based on electrostrictive polymers is essential in smart materials applications such as actuators, transducers, microelectromechanical systems, storage memory devices, energy harvesting, and biomedical sensors. The key factors for increasing the capability of electrostrictive materials are stronger dielectric properties and an increased electroactive β-phase and crystallinity of the material. In this work, the dielectric properties and microstructural β-phase in the P(VDF-HFP) polymer were improved by electrospinning conditions and thermal compression. The P(VDF-HFP) fibers from the single-step electrospinning process had a self-induced orientation and electrical poling which increased both the electroactive β-crystal phase and the spontaneous dipolar orientation simultaneously. Moreover, the P(VDF-HFP) fibers from the combined electrospinning and thermal compression achieved significantly enhanced dielectric properties and microstructural β-phase. Thermal compression clearly induced interfacial polarization by the accumulation of interfacial surface charges among two β-phase regions in the P(VDF-HFP) fibers. The grain boundaries of nanofibers frequently have high interfacial polarization, as they can trap charges migrating in an applied field. This work showed that the combination of electrospinning and thermal compression for electrostrictive P(VDF-HFP) polymers can potentially offer improved electrostriction behavior based on the dielectric permittivity and interfacial surface charge distributions for application in actuator devices, textile sensors, and nanogenerators.

Enhanced crystallization behaviors and dielectric performance of poly(vinylidene fluoride) film by induced polyamide-1

2021 ◽  
pp. 095400832110311
Author(s):  
Dandan Yuan ◽  
Rundi Yang ◽  
Yuanting Xu ◽  
Xufu Cai
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Polymer Composites ◽  
Loss Tangent ◽  
Vinylidene Fluoride ◽  
Crystallization Rate ◽  
Dielectric Materials ◽  
Crystallization Behaviors ◽  
Dielectric Performance ◽  
Poly Vinylidene Fluoride

Poly(vinylidene fluoride) (PVDF)-based composites attract tremendous attention as dielectric materials. However, their development has been limited due to the raised problem in the in-homogeneous polymer composites. In this work, a novel PVDF-based film incorporated with polyamide-1, containing the highest density of dipole among all polyamides, was prepared to improve the crystallization behaviors and dielectric properties. The results showed that the optimal concentration of polyamide-1 in PVDF was 6 wt.%. The crystallization rate of PVDF was improved in the presence of polyamide-1. Interestingly, the polyamide-1 was conductive to the formation of β form crystal of PVDF, which exhibited great electric performance. The dielectric constant of PVDF increased sharply and loss tangent still kept at a low level of 0.03@100 Hz when the concentration of polyamide-1 was 6 wt.%. This work may provide a new direction to design dielectric materials for PVDF blends.

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