Permittivity, loss factor and Cole-Cole model of acrylic materials for dielectric elastomers

Abstract

In this study, the dielectric constants of VHB4905 and VHB4910 are measured systematically, and the capacitance, edge capacitance, dielectric loss and dielectric loss factor are analyzed. The dielectric properties are revealed from the microstructure, and the Cole-Cole model is used to characterize the dielectric properties. The results show that the dielectric constant is very sensitive to the frequency dependence, but it is sensitive to the real and imaginary parts from 102 Hz to 106 Hz. The relative errors of their permittivity are small, when the edge effect is not taken into account. At high frequency, the orientation movement of the polar group on the side chain of VHB acrylic leads to the decrease of the molecular polarizability, and the energy consumption of electric dipole, shift polarization and turn polarization leads to the decrease of the dielectric constant and the increase of the dielectric loss. The fitting correlation coefficients of dielectric constant for VHB4905 and VHB4910 are high, which describe the polarization relaxation behavior of VHB acrylic acid. The research in this paper is helpful to understand the electrical characteristics of acrylic acid, and provides a basis for the design and control of dielectric elastomer actuator. © 2021