Polysulfide polyurethane–urea-based dielectric composites with CeO₂-loaded MXene exhibiting high self-healing efficiency

Abstract

To overcome the dilemma of high actuation voltages that prone dielectric elastomer films to breakdown, fabricating films with excellent dielectric properties and high durability is the current focus. Previously reported...

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO2 loaded carbon nanotubes

“…where, σ, f , and f c denote the DC conductivity, the volume fraction, and the percolation threshold of the composite, respectively. 26 Noticeably, the dielectric constant of CNT/ARE and SiO 2 @CNT/ARE films decreases with increasing frequency in Figure 4D,E. The dielectric constant of the composites is known to be intimately related to the polarization such as electron polarization, interfacial polarization, and dipole polarization.…”

“…Since SiO 2 acts as an insulator and reduces the electrical conductivity when loaded on the CNT, in addition, the SiO 2 on the CNT surface prevents direct contact with each other and delays the establishment of the conductive network inside the composite, 24,25 as can be seen according to Figure 4C, the conductivity of 2.41 vol% CNT/ARE is 2.62 × 10 −8 S/m, whereas the conductivity of 3.22 vol% SiO 2 @CNT/ARE after the SiO 2 loading is 1.22 × 10 −8 S/m. Furthermore, the SEM images of the fracture surface of the composite film illustrate that SiO 2 @CNT is more compatible with the ARE, and SiO 2 @CNT can be dispersed more homogeneously in the ARE, retarding the establishment of the conductive paths and improving the value of f c . where, σ , , and denote the DC conductivity, the volume fraction, and the percolation threshold of the composite, respectively 26 …”