Actuating Shape Memory Polymer for Thermoresponsive Soft Robotic Gripper and Programmable Materials.

Area of Science:

• Materials Science
• Polymer Chemistry
• Robotics Engineering

Background:

• Soft robotics and programmable metamaterials require advanced thermoresponsive actuating systems.
• Current methods for creating integrated actuating systems are limited.
• Novel polymer-based solutions are needed for enhanced functionality.

Purpose of the Study:

• To synthesize and characterize a novel thermoresponsive polymer for actuating systems.
• To demonstrate the application of this polymer in soft robotics and programmable materials.
• To investigate the material's actuation performance and stability.

Main Methods:

• Polymer synthesis involving poly(1,10-decylene adipate) diol (PDA) and polyester urethane (PEU) formation.
• Additive manufacturing using fused-filament fabrication to create actuator elements.
• Thermomechanical treatment and cyclic heating-cooling tests to evaluate actuation properties.
• Integration of actuator elements into a gripper system and unit cells for programmable materials.

Main Results:

• A polyester urethane (PEU) was successfully synthesized and processed into filaments.
• The PEU demonstrated reliable stress-free actuation, expanding on cooling and shrinking on heating.
• Maximum thermoreversible strain reached 16.1%, stabilizing at 12.2% after 100 cycles.
• Actuators successfully operated a gripper to handle a hen's egg and enabled temperature-dependent behavior in unit cells.

Conclusions:

• The developed PEU offers a promising approach for creating integrated thermoresponsive actuating systems.
• This material enables new opportunities in soft robotics, programmable materials, and shape morphing applications.
• The study validates the potential of polymer-based actuators for advanced functional materials.