Free volume dependence of dielectric behaviour in sandwich-structured high dielectric performances of poly(vinylidene fluoride) composite films

Nanoscale ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 300-310
Author(s):  
Lei Yang ◽  
Lanqiong Yang ◽  
Kun Ma ◽  
Yu Wang ◽  
Tong Song ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Free Volume ◽  
Vinylidene Fluoride ◽  
Breakdown Strength ◽  
Composite Films ◽  
Atomic Scale ◽  
Scale Free ◽  
Volume Dependence ◽  
Poly Vinylidene Fluoride ◽  
High Dielectric

Atomic-scale free volume holes have significant effects on the dielectric constant and breakdown strength of polymer composite films.

scholarly journals Preparation of the high dielectric performance flexible materials achieved by polyacrylamide/poly(vinylidene fluoride) blends

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Rui Li ◽  
Chuanxi Xiong ◽  
Lijie Dong
Keyword(s):  
Dielectric Constant ◽  
Flexible Electronics ◽  
High Dielectric Constant ◽  
Vinylidene Fluoride ◽  
Volume Fraction ◽  
Breakdown Strength ◽  
Dielectric Behavior ◽  
Dielectric Performance ◽  
Poly Vinylidene Fluoride ◽  
High Dielectric

AbstractA novel all-polymeric material with high dielectric constant (k) has been developed by blending poly(vinylidene fluoride) (PVDF) with polyacrylamide (PAM). The dependence of the dielectric constant on frequency and polymer volume fraction was investigated. When the weight fraction of PAM is 1wt%, the dielectric constant of the blend could be up to 24, and the dielectric loss tanδ can be lowered to 0.06. The SEM investigations suggest that the enhanced dielectric behavior originates from significant interfacial interactions of polymer-polymer. XRD and FTIR demonstrate that blending PAM with PVDF affects the crystalline behavior of each component. Our finding suggests that the created high-k polymeric blends represent a novel type of material that are flexible and easy to process, and is of relatively high dielectric constant and high breakdown strength; moreover find applications as flexible electronics.

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

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%.

scholarly journals Enhanced Dielectric Performance of P(VDF-HFP) Composites with Satellite–Core-Structured Fe2O3@BaTiO3 Nanofillers

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1541 ◽  
Author(s):  
Yongchang Jiang ◽  
Zhao Zhang ◽  
Zheng Zhou ◽  
Hui Yang ◽  
Qilong Zhang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Flexible Electronics ◽  
Vinylidene Fluoride ◽  
Breakdown Strength ◽  
Composite Films ◽  
Interfacial Polarization ◽  
Dielectric Materials ◽  
Dielectric Performance ◽  
High Dielectric

Polymer dielectric materials are extensively used in electronic devices. To enhance the dielectric constant, ceramic fillers with high dielectric constant have been widely introduced into polymer matrices. However, to obtain high permittivity, a large added amount (>50 vol%) is usually needed. With the aim of improving dielectric properties with low filler content, satellite–core-structured Fe2O3@BaTiO3 (Fe2O3@BT) nanoparticles were fabricated as fillers for a poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix. The interfacial polarization effect is increased by Fe2O3 nanoparticles, and thus, composite permittivity is enhanced. Besides, the satellite–core structure prevents Fe2O3 particles from directly contacting each other, so that the dielectric loss remains relatively low. Typically, with 20 vol% Fe2O3@BT nanoparticle fillers, the permittivity of the composite is 31.7 (1 kHz), nearly 1.8 and 3.0 times that of 20 vol% BT composites and pure polymers, respectively. Nanocomposites also achieve high breakdown strength (>150 KV/mm) and low loss tangent (~0.05). Moreover, the composites exhibited excellent flexibility and maintained good dielectric properties after bending. These results demonstrate that composite films possess broad application prospects in flexible electronics.

Preparation, Morphology and Dielectric Properties of Polyamide-6/Poly(Vinylidene Fluoride) Blends

2012 ◽  
Vol 496 ◽  
pp. 263-267
Author(s):  
Rui Li ◽  
Jian Zhong Pei ◽  
Yan Wei Li ◽  
Xin Shi ◽  
Qun Le Du
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Flexible Electronics ◽  
High Dielectric Constant ◽  
Vinylidene Fluoride ◽  
Volume Fraction ◽  
Polyamide 6 ◽  
Dielectric Constants ◽  
Poly Vinylidene Fluoride ◽  
High Dielectric

A novel all-polymeric material with high dielectric constant (k) has been developed by blending poly (vinylidene fluoride) (PVDF) with polyamide-6 (PA6). The dependence of the dielectric properties on frequency and polymer volume fraction was investigated. When the volume fraction of PA6 is 20%, the dielectric property is better than others. The SEM investigations suggest that the enhanced dielectric behavior originates from significant interfacial interactions of polymer-polymer. The XRD demonstrate that the PA6 and PVDF affect the crystalline behavior of each component. Furthermore, the stable dielectric constants of the blends could be tuned by adjusting the content of the polymers. The created high-k all-polymeric blends represent a novel type of material that are simple technology and easy to process, and is of relatively high dielectric constant, applications as flexible electronics.

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