High dielectric performance of polyamide 11/poly(vinylidene fluoride) blend films induced by interfacial glycidyl methacrylate

AbstractIn this study, the solution method was used to prepare polyamide 11/polyvinylidene difluoride (PA11/PVDF) blend films. The crystal phase compositions and microstructures of the blends were studied by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy analysis. Additionally, the dielectric properties of the PA11/PVDF blends, with different ratios and concentrations, were tested. The results indicated that the solution method is more propitious in forming β crystals during the preparation of the PA11/PVDF blend films compared with the melt blending method. The amount of β crystals present in PVDF was dependent on the ratio of dimethyl sulfoxide (DMSO) and H2O. Specifically, for the 5:95 ratio of DMSO/H2O precipitants, the PA11/PVDF (80:20) blend films prepared by the solution method had a high dielectric constant of 188.1 and a dielectric loss of 1.37.

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Polar-fluoropolymer Blends for High Energy Density Low Loss Capacitor Applications

MRS Proceedings ◽

10.1557/opl.2011.905 ◽

2011 ◽

Vol 1312 ◽

Author(s):

Shan Wu ◽

Minren Lin ◽

David S-G. Lu ◽

Qiming Zhang

Keyword(s):

Dielectric Constant ◽

Energy Density ◽

Electric Fields ◽

Vinylidene Fluoride ◽

High Energy ◽

High Energy Density ◽

Low Loss ◽

Blend Films ◽

Dielectric Performance ◽

High Dielectric

ABSTRACTBesides energy density, the electric loss at high electric fields is another major concern for many capacitor applications. This paper presents recent works in developing high energy density low loss polymer capacitors. In order to reduce the dielectric loss while maintaining high energy density in poly(vinylidene fluoride-hexafluoropropylene) P(VDF-HFP) and P(VDF-CTFE) (CTFE: Chlorotrifluoroethylene) based polymers, a polymer blend approach was investigated. We show that by blending P(VDF-CTFE) with a proper low loss polymer such as poly(ethylene- chlorotrifluoroethylene) (ECTFE) can lead to marked improvement in the loss of dielectric films. In this study, P(VDF-CTFE) blends films with different wt% of ECTFE have been examined to find a balance between dielectric constant and the loss. In addition, crosslink in the blends has been employed to further improve the dielectric performance of the blends. The results indicate that these blends exhibit an excellent performance: relatively high dielectric constant (~ 6~7) and low loss (~ 0.01) at 1 kHz. For the crosslink blend films, the high field loss is reduced to below 5% with a discharged energy density 4.3 J/cm3 under a field of 300 MV/m.

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

e-Polymers ◽

10.1515/epoly.2011.11.1.892 ◽

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.

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