Dielectric Polymer with Designable Large Motion under Low Electric Field.

Area of Science:

• Materials Science
• Robotics Engineering
• Polymer Chemistry

Background:

• Dielectric elastomers (DEs) offer fast, large in-plane actuation via electric field (e-field)-induced Maxwell stress, crucial for robotic applications.
• Existing DEs require high driving e-fields (20-100 V µm⁻¹), leading to bulky power systems and reduced durability.

Purpose of the Study:

• To develop a novel dielectric polymer capable of diverse, large-amplitude motions under low e-fields.
• To explore the potential of crystalline dynamic covalent networks for advanced soft robotic actuation.

Main Methods:

• Synthesized a crystalline dynamic covalent network polymer.
• Utilized heating above melting temperature to transform the polymer into a dielectric elastomer (DE).
• Investigated the geometric effect and crystallization transition for actuation amplification and multimodal motion.

Main Results:

• Achieved significant in-plane actuation at low e-fields (2-10 V µm⁻¹), a tenfold reduction compared to conventional DEs.
• Demonstrated programmable, diverse 3D motions through reconfiguration of the covalent network.
• Observed enhanced actuation amplification due to the geometric effect and dynamic multimodal motions from crystallization.

Conclusions:

• The novel crystalline dynamic covalent network offers a promising platform for low-field, high-performance dielectric elastomer actuators.
• This material provides unique design versatility for developing advanced soft robots with active deployability and complex movements.