Nanostructured block copolymer muscles

Area of Science:

• Materials Science
• Polymer Science
• Robotics

Background:

• High-performance actuating materials are crucial for advancements in robotics, prosthetics, and smart clothing.
• Current actuators often face limitations in efficiency, strain, and mechanical robustness.

Purpose of the Study:

• To develop novel fiber actuators with enhanced performance characteristics.
• To explore the potential of block copolymer self-assembly and strain-programmed crystallization for actuator fabrication.

Main Methods:

• Utilized solution-phase block copolymer self-assembly.
• Employed strain-programmed crystallization to create aligned nanoscale structures.
• Fabricated fiber actuators with alternating crystalline and amorphous domains.

Main Results:

• Achieved high efficiency (75.5%) and actuation strain (80%).
• Demonstrated exceptional mechanical properties, including strain-at-break up to 900% and toughness up to 121.2 MJ/m³.
• Exhibited on/off rotary actuation (450 rpm) and multi-trigger actuation (heat, hydration).

Conclusions:

• The nanostructured block copolymer muscles offer significant advantages over existing actuators.
• The facile fabrication method, versatility, and recyclability open new possibilities for multifunctional actuators.
• These findings pave the way for advanced robotics, prosthetics, and smart textiles.