Highly enhanced frequency- and temperature-stability permittivity of three-phase poly(vinylidene-fluoride) nanocomposites with retaining low loss tangent and high permittivity

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.

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Characterization and performance of plate-like Ba0.6Sr0.4TiO3/Poly(vinylidene fluoride – trifluoroethylene -chlorotrifluoroethylene) composites with high permittivity and low loss

Polymer ◽

10.1016/j.polymer.2020.122777 ◽

2020 ◽

Vol 203 ◽

pp. 122777

Author(s):

Yiting Guo ◽

Nan Meng ◽

Yiming Zhang ◽

Jie Xu ◽

Emilia Pawlikowska ◽

...

Keyword(s):

Vinylidene Fluoride ◽

Low Loss ◽

High Permittivity ◽

Poly Vinylidene Fluoride ◽

And Performance

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PVDF promotes TiO2 dispersion to obtain composite films with high dielectric constant and low loss

High Performance Polymers ◽

10.1177/09540083211044054 ◽

2021 ◽

pp. 095400832110440

Author(s):

Mingyun Peng ◽

Ke Li ◽

Bingliang Huang ◽

Jie Cheng

Keyword(s):

Dielectric Constant ◽

Room Temperature ◽

Vinylidene Fluoride ◽

In Situ Polymerization ◽

Composite Films ◽

Low Loss ◽

Three Phase ◽

Poly Vinylidene Fluoride ◽

High Dielectric

A series of three-phase composite films with different filler contents were prepared by in-situ polymerization. The composite films comprise polyimide (PI), poly (vinylidene fluoride) (PVDF), and titanium dioxide (TiO2). Compared with PI/TiO2 composite films, the PI/TiO2-PVDF composite films not only get a significant increase in dielectric constant, but also own better mechanical properties. Our results show that with the loading of 50wt% PVDF particles, the dielectric constant of PI/TiO2-PVDF composite films increased from 6.5 to 18.14 at 1 MHz and room temperature, while the tensile strength of PI/TiO2-PVDF composite films increased from 45 to 72 MPa. In addition, the films maintain a low loss tangent of about 0.02. PI/PVDF composite films were also prepared. It was found that dielectric constant of PI/PVDF composite was significantly lower than that of PI/TiO2-PVDF composite films when the loading of PVDF is 50wt%.

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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 ◽

10.3390/polym13213641 ◽

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.

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

RSC Advances ◽

10.1039/c7ra01675a ◽

2017 ◽

Vol 7 (28) ◽

pp. 17128-17136 ◽

Cited By ~ 14

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.

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