scholarly journals Microstructure and Electrical Properties of Fluorene Polyester Based Nanocomposite Dielectrics

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3053
Author(s):  
Wenchao Zhang ◽  
Kuo Zhao ◽  
Feng Guan ◽  
Jinghua Yin ◽  
Yu Feng ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Breakdown Strength ◽  
Dielectric Material ◽  
Composite Films ◽  
High Strength ◽  
Sio2 Nanoparticles ◽  
X Ray ◽  
Low Dielectric ◽  
High Dielectric ◽  
Corona Resistance

As a new type of dielectric material, the low dielectric constant and corona resistance life of fluorene polyester (FPE) restricts the range of its applications. In order to simultaneously achieve a high dielectric constant and the long corona aging lifetime of FPE, SiO2 nanoparticles were chosen as additive to prepare FPE-based composite films. The microstructure of the composite film was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared spectroscopy (IR) and small-angle X-ray scattering (SAXS). The dielectric performances of the composites, including the dielectric constant, breakdown strength and corona resistance lifetime, were investigated. The results show that the introduced SiO2 does not destroy the structure of the FPE molecular chain and that it increases the thickness of the filler-matrix interface. The dielectric constant of SiO2/FPE composites increased from 3.54 to 7.30 at 1 Hz. Importantly, the corona resistance lifetime increased by about 12 times compared with the pure FPE matrix. In brief, this work shows what possibilities there might be when considering the potential applications of high-strength insulating materials.

NH2-functionalized carbon-coated Fe3O4 core–shell nanoparticles for in situ preparation of robust polyimide composite films with high dielectric constant, low dielectric loss, and high breakdown strength

RSC Advances ◽  
2016 ◽  
Vol 6 (109) ◽  
pp. 107533-107541 ◽  
Author(s):  
Xinliang Fang ◽  
Shanfeng Wang ◽  
Yanxiao Li ◽  
Xiaoyun Liu ◽  
Xinxin Li ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
High Dielectric Constant ◽  
Breakdown Strength ◽  
Composite Films ◽  
Shell Nanoparticles ◽  
Low Dielectric ◽  
In Situ Preparation ◽  
Carbon Coated ◽  
High Dielectric

Thermostable amine-functionalized carbon-coated Fe3O4/polyimide composites with high dielectric constant and low dielectric loss were created at a low percolation threshold.

Skin–core structured fluorinated MWCNTs: a nanofiller towards a broadband dielectric material with a high dielectric constant and low dielectric loss

2018 ◽  
Vol 6 (9) ◽  
pp. 2370-2378 ◽  
Author(s):  
Yang Liu ◽  
Cheng Zhang ◽  
Benyuan Huang ◽  
Xu Wang ◽  
Yulong Li ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
High Dielectric Constant ◽  
Dielectric Material ◽  
Epoxy Composite ◽  
Low Dielectric ◽  
High Dielectric

A novel skin–core structured fluorinated MWCNT nanofiller was prepared to fabricate epoxy composite with broadband high dielectric constant and low dielectric loss.

Preparation and properties of thermostable well-functionalized graphene oxide/polyimide composite films with high dielectric constant, low dielectric loss and high strength via in situ polymerization

2015 ◽  
Vol 3 (18) ◽  
pp. 10005-10012 ◽  
Author(s):  
Xinliang Fang ◽  
Xiaoyun Liu ◽  
Zhong-Kai Cui ◽  
Jun Qian ◽  
Jijia Pan ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Graphene Oxide ◽  
Dielectric Loss ◽  
High Dielectric Constant ◽  
In Situ Polymerization ◽  
Composite Films ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Low Dielectric ◽  
High Dielectric

Thermostable well-functionalized graphene oxide/polyimide composites with high dielectric constant and low dielectric loss were obtained at a low percolation threshold.

High Strength Low Dielectric Constant Aromatic Thermosets

2005 ◽  
Vol 863 ◽  
Author(s):  
Yongqing Huang ◽  
James Economy
Keyword(s):  
Thermal Stability ◽  
Dielectric Constant ◽  
Young’S Modulus ◽  
Breakdown Strength ◽  
Young's Modulus ◽  
Chemical Vapor ◽  
High Strength ◽  
Low Dielectric Constant ◽  
Crosstalk Noise ◽  
Low Dielectric

AbstractContinuing miniaturization of microelectronic devices requires development of low dielectric constant materials to lower the RC delay, power dissipation and crosstalk noise. Although spin-on polymer dielectrics usually have better potential for extendibility to lower dielectric constant (k) values compared to chemical-vapor-deposited dielectrics, their low mechanical properties prevent them from being successfully integrated with copper metal lines.Recent evaluation of a new thermosetting oligomer shows high thermal stability, low moisture pick-up and low dielectric constant. Techniques to optimize the solubility and spin coating characteristics of the oligomer have been developed. The thermally cured polymer displayed a thermal stability up to 480°C in nitrogen and 400°C in air. The cured polymer displayed a dielectric constant of 2.7 at 1 MHz and a breakdown strength larger than 230 V/μm. Nanoindentation testing showed that it had an extraordinarily high Young's modulus of 16.8 GPa and a hardness of 3.5 GPa. By use of porogens, a dielectric constant as low as 1.85 was obtained while still maintaining an acceptable high Young's modulus of 7.7 GPa and hardness of 2.0 GPa. Nanoscratch testing indicated that this material had good adhesion to the Si substrate, and Ta which is a diffusion barrier for copper. These results appear unique compared to all commercially available low-k candidates.

Polymer Nanocomposites for Energy Storage Applications

2010 ◽  
Author(s):  
Amira B. Meddeb ◽  
Zoubeida Ounaies
Keyword(s):  
Dielectric Constant ◽  
Energy Storage ◽  
Polymer Nanocomposites ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Polarized Light ◽  
Scanning Calorimetry ◽  
Low Dielectric ◽  
Energy Storage Applications ◽  
High Dielectric

High dielectric polymer nanocomposites are promising candidates for energy storage applications. The main criteria of focus are high dielectric breakdown strength, high dielectric constant and low dielectric loss. In this study, we investigate the effect of the addition of TiO2 particles to PVDF matrix on the dielectric constant, breakdown and energy density of the system. The dispersion of the particles is qualified by scanning electron microscopy (SEM). The morphology of the composites is characterized by polarized light microscopy, Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). The dielectric properties are measured by a Novocontrol system with an Alpha analyzer. Finally, the breakdown measurements are carried out by a QuadTech hipot tester.

scholarly journals Dielectric Constant Enhancement with Low Dielectric Loss Growth in Graphene Oxide/Mica/Polypropylene Composites

2021 ◽  
Vol 5 (2) ◽  
pp. 52
Author(s):  
Chao-Yu Lee ◽  
Chia-Wei Chang
Keyword(s):  
Dielectric Constant ◽  
Graphene Oxide ◽  
Dielectric Loss ◽  
Energy Density ◽  
Breakdown Strength ◽  
Dielectric Material ◽  
Dielectric Strength ◽  
Self Healing ◽  
Organic Thin Film ◽  
Low Dielectric

Polypropylene has been widely used as dielectric material in organic thin-film capacitors due to their high breakdown strength, low dielectric loss and self-healing capability. However, polypropylene’s energy density is relatively low. Increasing the energy density of polypropylene by adding materials with a high dielectric constant is commonly used. Still, it often leads to an increase in dielectric loss, lower dielectric strength and other shortcomings. In this study, a thin 2D platelet of mica/graphene oxide composite material was made from exfoliated mica as a substrate and attached by graphene oxide. The mica/graphene oxide platelets were added to polypropylene to make a plastic dielectric composite. The non-conductive flat inorganic additive can increase the dielectric constant and dielectric strength of the composite without increasing dielectric loss. The tiny mica/graphene oxide platelets can significantly improve the dielectric properties of polypropylene. The results show that by adding a small amount (less than 1 wt%) mica/graphene oxide, the relative dielectric constant of polypropylene can increase to more than 3.7 without causing an increase in dielectric loss and the dielectric strength of polypropylene can also enhance.

scholarly journals The influence of the partially europium substitution on the AC electrical properties of BiSr2CaCu2O6.5 ceramics

2019 ◽  
Vol 13 (4) ◽  
pp. 323-332 ◽  
Author(s):  
Zeynep Özdemir ◽  
Mehmet Kılıç ◽  
Yaşar Karabul ◽  
Seda Erdönmez ◽  
Orhan İçelli
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
High Dielectric Constant ◽  
Earth Metal ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Low Dielectric ◽  
Fourier Transformed Infrared Spectroscopy ◽  
High Dielectric

In this work, EuxBi1-xSr2CaCu2O6.5 (where x = 0, 0.3, 0.5) samples were prepared by solid-state reaction method and sintered at 950?C for 24 h. The structural characterizations were done by X-ray diffraction, X-ray fluorescence, scanning electron microscope and Fourier transformed infrared spectroscopy. The thermal stability of the samples was also analysed by thermogravimetric TG and DTA measurements. It was shown that Eu0.5Bi0.5Sr2CaCu2O6.5 sample exhibited high dielectric constant and low dielectric loss relative to BiSr2CaCu2O6.5 material. Thus, the dielectric loss was lowered by heavy rare earth metal substitution on Bi-Sr-Ca-Cu-O ceramics while the dielectric constant still remained high. Temperature-dependent complex electrical modulus spectra obtained between 296 and 433K also revealed the temperature-activated relaxation process in the materials which can be attributed to the Maxwell-Wagner type polarization effect. Ultimately, it was suggested that the Eu0.5Bi0.5Sr2CaCu2O6.5 ceramics may have a promising potential for applications which require high dielectric constant with a low dielectric loss.

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