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Durable liquid-crystalline vitrimer actuators.

Qiaomei Chen1, Yongsan Li1, Yang Yang1

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Summary
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This study introduces a new method for creating stable liquid-crystalline elastomer (LCE) actuators by reducing catalyst content. This approach balances processability with long-lasting actuation performance for complex 3D structures.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Robotics

Background:

  • Liquid-crystalline elastomers (LCEs) offer unique properties for actuators but face challenges in balancing processability with stability.
  • Traditional LCEs often compromise durability for ease of fabrication.

Purpose of the Study:

  • To address the conflict between processability and actuation stability in vitrimer-based LCEs.
  • To develop a method for preparing robust LCE actuators with complex 3D structures.

Main Methods:

  • Investigated a vitrimer-based epoxy/acid LCE system.
  • Reduced catalyst content to 0.25 mol% relative to the carboxyl group.
  • Evaluated actuation strain and stability through heating-cooling cycles.

Main Results:

  • Achieved monodomain LCEs with a large actuation strain of approximately 95%.
  • Demonstrated excellent actuation stability, maintaining full strain after 100 cycles and over 90% after 500 cycles.
  • Confirmed the ability to realign or reconfigure LCEs into complex 3D actuators.

Conclusions:

  • Reducing catalyst content in LCE vitrimers effectively balances processability and actuation stability.
  • The developed method enables the facile preparation of highly stable and reconfigurable LCE actuators.
  • This strategy opens avenues for advanced, durable, and complex 3D LCE actuator designs.