Optimising the dielectric property of carbon nanotubes/P(VDF‐CTFE) nanocomposites by tailoring the shell thickness of liquid crystalline polymer modified layer

Abstract

Interfacial modification is a good approach to improve the dielectric properties of nanocomposites. However, there are few reports to study the influence of interfacial modified thickness. In this study, the graft-from strategy was adopted to introduce the rigid liquid crystalline fluoropolymer (poly[2,5-bis[(4-trifluoromethoxyphenyl)-oxycarbonyl]] styrene (PTFMS) onto the surface of carbon nanotubes (CNT). The shell thickness increased from 20 ± 3 to 62 ± 6 nm via controlling the ratio of monomer to the initiator. The results indicated that the dielectric properties of the P(VDF-CTFE) nanocomposites with the modified CNT were significantly enhanced compared with those original CNT, and the maximum dielectric constant of nanocomposites with 1.25 vol % CNT@PTFMS containing the thickest thickness reached 36 at 40 Hz due to the highest micro-capacitors, which was 360% than the neat P(VDF-CTFE). This work provides the perspective to understand the relationship between the shell thickness and dielectric property of polymer nanocomposites based on conductive fillers.

Improved Energy Density and Energy Efficiency of Poly(vinylidene difluoride) Nanocomposite Dielectrics Using 0.93Na0.5Bi0.5TiO3-0.07BaTiO3 Nanofibers

“…Therefore, dielectric capacitors are especially suitable for applications with the demands of pulsed voltage or current. − However, capacitors loaded components/device in modern electronics and electrical industries are bulky due to the problem of low energy storage density. To meet the needs of miniaturization, lightweight, and integration of electrical and electronic equipment, it is imperative to develop dielectric capacitors with high energy storage density. − …”

Functional performance evolution of urchin‐like structured SiO2‐carbon nanotube hybrid constructions reinforcing polyethylene‐based composites

“…[ 38 ] Specifically, the dielectric constant of both SCH/PE and SSCH/PE composites sharply increases with the hybrid loading, which can be explained by the development of micro‐capacitor network. [ 39–41 ] The dielectric constant improvement of SCH/PE composites is significantly higher than that of SSCH/PE composites at any same filler loading. It is mainly because that the detached CNTs could make an important contribution to the establishment of micro‐capacitor network.…”

Flexible Liquid Crystal Polymer Technologies from Microwave to Terahertz Frequencies

“…In addition to the traditional wireless applications, LCP films have been proposed in many other interesting applications, such as micro-electro-mechanical systems (MEMS) [16], biomedical devices [17], microfluidics [18], nanomaterial carriers [130][131][132], and roll-to-roll manufacturing [133]. In this section, we briefly review the first three applications, each of which has been extensively studied.…”