Review on the role of intrinsic structure on properties of dielectric elastomers for enhanced actuation performance

Abstract

Progress in the design and modifications of dielectric elastomers has offered numerous effective techniques to improve their electrically induced actuation response. The actuation behaviour improves due to changes in electromechanical properties that eventually signifies the adjustments in the aspects of the structure of elastomer. This report aims to insight into the role of intrinsic structure on the electromechanical properties, considering the influences of pre-strain, fillers, and chemical modification techniques to enhance actuation performance. The aspects of structure namely, molecular structure, crosslink density, micropores, and interfacial characteristics are focused to reaffirm their relationship with the dielectric and mechanical properties of the elastomer. Thus, the effects of considered modification techniques on properties are discussed in the context of their impacts on structural parameters. These efforts together so identify the key challenges and opportunities in a complete understanding of structure-property relationships to improve actuation behaviour. Indeed, this may serve as a report on important information and focus required to obtain flexible dielectrics with desired electromechanical properties.