Effect of frequency on dielectric properties of TiO2/PDMS dielectric elastomers

Dielectric elastomeric materials are a new type of electroactive polymers that can produce large deformation under electric field stimulation and can be widely used as actuators and sensors. Among them, Dow Corning's PDMS is the most widely studied silicone rubber-based dielectric elastomer material. Its key electrical parameters, especially the dielectric constant, affect the overall electromechanical coupling performance. So far, people's understanding of the dielectric constant value of PDMS dielectric materials is not uniform, especially the influence of frequency on dielectric constant is very different, and few scholars analyze it from the mechanism. Based on this situation, different TiO2/PDMS dielectric elastomers were prepared firstly, and then the influence of frequency (0-10(5) Hz) on the dielectric properties of TiO2/PDMS dielectric materials was studied by high-low-frequency dielectric constant meter. It is found that the material has strong low frequency dependence and weak high frequency dependence. Finally, from the microscopic point of view, the mechanism of the dielectric constant of TiO2/PDMS dielectric material changing with frequency is due to the fact that material dipole steering polarizability changes with frequency.