Overview
This research focuses on enhancing the electrostrictive strain of P(VDF-TrFE-CFE) terpolymer. The aim is to develop materials suitable for deformable mirror actuation within high-frequency adaptive optics systems. The study characterized material performance under alternating electric fields up to 50 V/um and within the kilohertz (kHz) frequency range.
Research Context
The work is conducted within the framework of the FlexSiMirror project, which targets adaptive optics systems requiring operation under specific electrical and frequency conditions. Existing deformable mirror actuators often necessitate materials that can sustain performance under alternating electric fields of up to 50 V/um and within the kHz frequency range. Traditional plasticizers, such as phthalates, commonly used in electroactive polymers, are typically suited for lower frequency ranges. This context informed the choice to investigate polymeric plasticizers for kHz operation.
Approach
The study sought to achieve greater strains by incorporating a polymeric plasticizer into the P(VDF-TrFE-CFE) terpolymer. The impact of plasticizer inclusion, up to 20 vol.%, on the actuation strain performance was investigated. Characterization involved assessing both the mechanical and dielectric properties of the modified materials in the kHz range. A key aspect of the approach was the utilization of a polymeric plasticizer, differentiating it from common phthalate plasticizers.
Findings
- Polymeric plasticizer addition resulted in a notable reduction of the elastic modulus in the kHz range.
- The plasticizer inclusion also restricted molecular migration.
- The figure of merit associated with strain (FOMstrain) increased by more than threefold.
- The modified P(VDF-TrFE-CFE) terpolymer achieved a strain output of 1.50% under 50 V/um.
- This achieved strain output was 3.6 times greater than that observed in the unmodified terpolymer.
- These results indicate enhanced electromechanical performance of the modified P(VDF-TrFE-CFE) in the kHz range.
Why This Matters
The observed enhancement in electromechanical performance of the modified P(VDF-TrFE-CFE) terpolymer in the kHz range suggests new possibilities for developing next-generation actuators. These actuators are intended for adaptive optics applications, where high-frequency operation and significant strain output are desirable.