Improved dielectric permittivity of NBCTO/epoxy composite films with low dielectric loss

Abstract

In this paper, NBCTO/epoxy composite films with different contents of NBCTO were prepared by solution mixing and casting method. The structure, morphology, thermostability and dielectric properties of the composite films were studied by X-ray diffraction, scanning electron microscopy, thermo-gravimetric analysis and broadband dielectric spectrometer. The composite film showed a homogeneous structure and better thermostability, and the dielectric permittivity was almost independent of the frequency range from 10 to 10 6 Hz at room temperature. The dielectric permittivity and dielectric loss of NBCTO/epoxy composite film increased with increasing in NBCTO content, and the dielectric permittivity was as high as 37.10 whereas the dielectric loss was only 0.019 at 1 kHz when the NBCTO volume fraction reached 50 vol%. Theoretical analysis indicated that the dielectric permittivity calculated by the EMT model was close to the experimental data. The results showed that NBCTO/epoxy composite might have potential applications in the electronic devices.

Simultaneously Improved Thermal and Dielectric Performance of Epoxy Composites Containing Ti3C2Tx Platelet Fillers

“…Similar phenomenon were also observed for epoxy composites [ 11 , 38 , 39 ], which can be attributed to the relaxation process [ 11 , 38 ], i.e., the decrease in dipolar polarization and interfacial polarization [ 39 ]. Moreover, the fact that the decrease of the dielectric permittivity with the frequency is quite smooth (i.e., dielectric permittivity decreases slightly with the increasing frequency) may reflect a uniform filler distribution in the epoxy matrix [ 11 ]. Figure 7 a also shows that the dielectric permittivity of epoxy composite increases as the filler content increases.…”

“…Polymer composites with substantially improved thermal conductivity ( k ) [ 1 , 2 , 3 ] and dielectric permittivity ( ε ) [ 4 ] are in great need for many applications, such as thermal interface materials [ 5 , 6 ], heat dissipation and thermal management [ 7 , 8 , 9 ], microelectronics, and energy storage related applications [ 4 , 10 , 11 , 12 ]. Appropriate fillers with inherent high performance are essential for preparing these desired functional polymer composites.…”

Synthesis, characterization and dielectric studies of poly(1-naphthylamine)–tungsten disulphide nanocomposites

“…IGA based dielectrics and capacitors are attractive due to their ease of synthesis, low cost and high stability. Polymeric dielectrics are attractive as they have high dielectric breakdown field strength along with the additional advantage of processability, flexibility and chemical stability, but dielectric permittivity of polymers is low [29][30][31]. Conjugated polymers (CPs) are a particular category of macromolecules with highly polar structure and conjugated backbone, which are gaining more academic interest as the dielectric materials.…”