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Shape-Programmable Liquid-Crystalline Polyurethane-Based Multimode Actuators Triggered by Light-Driven Molecular

Jinying Bao1, Zizheng Wang1, Chenjie Song2

  • 1Beijing Advanced Innovation Center for Materials Genome Engineering & School of Materials Science and Engineering, Peking University, Beijing, 100871, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|July 17, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed light-responsive polymer films using molecular motors to create advanced soft actuators. These actuators enable complex, large-amplitude motions for biomimetic devices and artificial robots.

Keywords:
light-responsive materialsliquid-crystalline polyurethanemolecular motorsmultimode actuators

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Robotics

Background:

  • Light-driven soft actuators are crucial for artificial robots and biomimetic devices.
  • Amplifying molecular isomerization to macroscopic actuation with complex motions remains a challenge.

Purpose of the Study:

  • To develop a novel light-responsive liquid-crystalline polyurethane elastomer using phototriggered molecular motors.
  • To achieve amplified molecular motion into macroscopic actuation with large amplitude and complex motions.

Main Methods:

  • Synthesized a trifunctional molecular motor with an ethylene glycol spacer.
  • Utilized the molecular motor as a crosslinker and unidirectional stirrer in a polyurethane elastomer.
  • Investigated the phototriggered actuation of the resulting shape-programmable polymeric film.

Main Results:

  • The developed polymeric film exhibits superior mechanical properties and a shape-memory effect.
  • Achieved diverse macroscopic motions including bending, unwinding, and contracting.
  • Demonstrated tunable actuation speed over a wide range.

Conclusions:

  • The strategy effectively amplifies molecular isomerization to macroscopic actuation.
  • Paved a new way for designing advanced light-responsive soft actuators and robots.
  • Highlights the potential of overcrowded alkene-based molecular motors in soft robotics.