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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
Published on: May 20, 2018
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Fabricating liquid crystal actuators: from small pre-strain to large actuation strain
Enjian He1, Yixuan Wang1, Yanjin Yao1
1The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University Beijing 100084 China.
Chemical Science
|November 28, 2025
Summary
Researchers developed reconfigurable liquid crystal elastomer (xLCE) actuators that achieve large actuation strains with minimal pre-strains. This breakthrough simplifies processing for soft robotics and artificial muscles.
Area of Science:
- Materials Science
- Polymer Chemistry
- Soft Robotics
Background:
- Liquid crystal elastomers (LCEs) offer anisotropic deformation for actuators and sensors.
- Dynamic covalent bonds in LCEs (xLCEs) allow reconfigurability and programmable actuation.
- Conventional methods require high pre-strains and temperatures, limiting practical applications.
Purpose of the Study:
- To develop an efficient method for fabricating xLCE actuators with large actuation strains using minimal pre-strains.
- To investigate the influence of thermal programming parameters on actuation performance.
- To enable spatial programming of actuation for complex deformation modes.
Main Methods:
- Fabrication of monodomain xLCE actuators.
- Tuning thermal programming parameters (temperature, time) for bond exchange.
- Comparative studies with non-liquid crystalline dynamic polymer networks and LCEs without dynamic bonds.
- Local control over bond exchange kinetics for spatial programming.
Main Results:
- Achieved large actuation strains (up to 10%) with significantly reduced pre-strains.
- Demonstrated tunable actuation by optimizing temperature and time.
- Elucidated the mechanism of cooperative mesogen orientation and network rearrangement.
- Enabled spatial programming for complex, heterogeneous deformation in monolithic films.
Conclusions:
- An efficient method for fabricating high-performance xLCE actuators with minimal pre-strain was established.
- The findings significantly reduce processing constraints for reconfigurable LCEs.
- This work paves the way for advanced soft actuators with programmable and complex deformation capabilities.
