Electro-Actuator Polymers Exhibiting Giant Strain Coefficient and Polymer Devices Containing Such Polymers

ID# 2021-5250
Structural analysis of P(VDF-TrFE-CFE-FA) relaxor polymers.
Structural analysis of P(VDF-TrFE-CFE-FA) relaxor polymers

Technology Summary

This invention represents a new class of modified PVDF polymers that generate large actuation strain and large strain coefficient while maintaining the elastic modulus > 0.15 GPaThe polymeric material generates large actuation strength of ΔS/ΔE> 750 pm/V at electric fields below 60 MV/m.  The researchers have demonstrated these effects under different applied electric fields (from 30 MV/m to 70 MV/m) and formulationsA scholarly article describing the invention was published in Science (Chen, et al.; Vol. 375, pages 1418-1422; March 25, 2022) along with a third-party commentary. 

Application & Market Utility

Polyvinylidene difluoride and its copolymers are the most widely used piezoelectric polymers in the market for transducers, sensors, actuators, soft robots, artificial muscles, and wearable devicesHowever, many of these applications require larger electromechanical actuation strain than the polymers can currently provideWhile certain high-strain PVDF-based materials exist, they suffer from electric breakdown that limits the electric field, as a higher field will result in device failureDue to dielectric breakdown, larger films have a much lower breakdown field tolerance (<60 MV/m). 

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