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Shape-Switchable Liquid-Crystal Polymer Actuators with Light-Induced Shape Memory Effect.

Jinlei Wang1, Feng Pan1, Xiaojun Liu1

  • 1College of Smart Materials and Future Energy, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, 2005 Songhu Road, Shanghai 200438, P. R. China.

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|August 12, 2025
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Summary
This summary is machine-generated.

Researchers developed shape-switchable liquid-crystal polymer (LCP) actuators that can change their form and function. This innovation allows soft actuators to perform multiple tasks like rolling, crawling, and gripping using light.

Keywords:
liquid-crystal polymersphoto-crosslinkingphotodeformationshape memory effectsoft actuators

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Robotics

Background:

  • The initial shape of soft actuators is critical for their performance, influencing stress distribution and deformation.
  • Photodeformable liquid-crystal polymers (LCPs) offer precise, light-induced deformation but typically have fixed initial shapes, limiting functionality.
  • Existing LCP actuators are generally monofunctional due to their nonswitchable initial shapes.

Purpose of the Study:

  • To create shape-switchable LCP actuators with multiple functionalities.
  • To integrate an athermal light-induced shape memory effect (SME) into photodeformable LCP systems.
  • To enable LCP actuators to transform between different shapes and motion modes.

Main Methods:

  • Fabrication of shape-switchable LCP actuators by incorporating a reversible photodimerization of coumarins for light-induced SME.
  • Utilizing the photothermal effect of disperse red 1 acrylate to control mesogen alignment and enable independent actuation of switched shapes.
  • Developing a novel strategy for integrating shape memory into photodeformable LCPs.

Main Results:

  • Demonstrated LCPs exhibiting a light-induced shape memory effect (SME) through reversible photodimerization.
  • Achieved independent actuation of different shapes via light-induced mesogen alignment changes.
  • Successfully fabricated a soft actuator capable of multiple motion modes: rolling, crawling, and gripping.

Conclusions:

  • This study presents a novel design for multimorphology and multifunctional soft actuators.
  • The developed shape-switching mechanism advances the complexity and versatility of LCP-based intelligent systems.
  • This work establishes a new paradigm for designing adaptable and versatile soft robotic components.