Microstructure and Electrical Properties of Fluorene Polyester Based Nanocomposite Dielectrics

Abstract

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.

Adjusting the energy gap and interface effect of titania nanosheets synergistically enhances the energy storage performance of PVDF-based composites

“…23 Compared with PVDF and the PVDF/LTNS composite, the PVDF/STNS composite possesses interfaces with larger thickness, which may be associated with the interfacial interaction strength. 24…”

Low‐content metal‐organic framework enhanced interface effect to improve the insulation properties of polyimide‐based composite films

“…Besides, based on Porod law for polymers, the interface thickness ( t ) of the composites can be calculated. The formulas are as follows 25 : whereis the slope in each Porod curve and σ the standard deviation of the gaussian function. t value of UiO‐66/PI composites is shown in the Figure 2D.…”

“…18,24 Besides, based on Porod law for polymers, the interface thickness (t) of the composites can be calculated. The formulas are as follows 25 : respectively. β is the dimension factor of the filler used, For 3D structure UiO-66, β = 1/3 (Equation (S5)).…”

Microstructures and dielectric properties of fluorene polyester ternary nanocomposites optimized by zero‐dimensional and two‐dimensional fillers

“…According to the previous work of Zhang et al, the selected 9 wt% SiO 2 is reasonable and conducive to further research. 23 In this essay, a simple solution blending method was chosen to prepare FPE matrix nanocomposites. The preparation process of ternary films is illustrated in Figure 1.…”

“…Fluorene polyester (FPE) is a novel kind of dielectric material belonging to the hetero-aromatic family that can be used for insulating, storing energy, and other applications. 23 FPE establishes itself by its superior properties. The dielectric constant and breakdown strength of FPE are 3.5 and 524 kV/mm, respectively, while the dielectric loss is lower and can be kept to less than 0.003 in the range of 25-250 C. 23,24 At present, FPE films can be prepared by the solution blending method, which has higher charge and discharge efficiency and less temperature effect.…”