Contributing Factors of Dielectric Properties for Polymer Matrix Composites

Abstract

Due to the trend of multi-function, integration, and miniaturization of electronics, traditional dielectric materials are difficult to satisfy new requirements, such as balanced dielectric properties and good designability. Therefore, high dielectric polymer composites have attracted wide attention due to their outstanding processibility, good designability, and dielectric properties. A number of polymer composites are employed in capacitors and sensors. All these applications are directly affected by the composite’s dielectric properties, which are highly depended on the compositions and internal structure design, including the polymer matrix, fillers, structural design, etc. In this review, the influences of matrix, fillers, and filler arrangement on dielectric properties are systematically and comprehensively summarized and the regulation strategies of dielectric loss are introduced as well. Finally, the challenges and prospects of high dielectric polymer composites are proposed.

PANI/Zn‐Cu ferrite polymer composites as free‐standing high dielectric materials

“…With the dispersion of 5 wt.% different ferrite NPs, the dielectric loss was decreased by as low as bare film. This dielectric tangent loss is mainly affected by polarization loss and conductivity loss 79 . Notably, PANI polymer films with varying ferrite dispersions all have dielectric loss tangent values <0.1, which is acceptable for some applications like decoupling capacitors.…”

Enhancement of Energy Density in the BOPP-Based Sandwich-Structured Film by the Synergistic Effect of BaTiO3@Polyaniline Hybrid Dielectric Fillers

“…The frequency dependences of the dielectric constant and dielectric loss of the composites are shown in Figures S4–S6. The dielectric constant of composites became higher with more PANI being coated on BaTiO 3 accompanied by the rapid increase of the dielectric loss at the same time as the adjacent conductive particles may form a conductive path in the matrix. , The movement of dipoles cannot follow the electric field at high frequencies and result in the decrease of the dielectric constant …”

“…The dielectric constant of composites became higher with more PANI being coated on BaTiO 3 accompanied by the rapid increase of the dielectric loss at the same time as the adjacent conductive particles may form a conductive path in the matrix. 42,43 The movement of dipoles cannot follow the electric field at high frequencies and result in the decrease of the dielectric constant. 17 Grafting polymers onto the conductive particles is an effective way to suppress their dielectric loss as the polymer can isolate the conductive particles from each other.…”

Tailoring the Electrical Response of Polyvinylidene Fluoride Nanocomposites with Electrically Conductive and Dielectric Fillers

“…[34] The addition of BT and SrT, on the other hand, does not have a strong influence on the electrical conductivity, increasing up to σ = 1.5 Â 10 À9 (Ω.m) À1 , due to the dielectric nature of the fillers. Dielectric composites are excellent materials for sensors, actuators, and capacitive energy storage devices, among others, based on their large dielectric response, [35] whereas conductive composites are suitable for electrodes, conductive interconnections, and resistive sensing applications, [36] among others, the combination of both allows a large variety of electronic devices. [37] The dielectric response of neat PVDF and ceramic composites as a function of frequency is shown in Figure 6A, whereas the dielectric constant and losses are shown in Figure 6B as a function of filler content.…”