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Updated: May 12, 2026
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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
Published on: May 20, 2018
High-strength, programmable energy-dissipating liquid crystal elastomers via hydrogen-bond-locked 4D printing
1School of Materials Science and Engineering, Tianjin University, Tianjin 300350, P.R. China.
Iscience
|May 11, 2026
Summary
Researchers developed 4D-printed liquid crystal elastomers (LCEs) with enhanced strength and programmable damping. Grafting a UPy motif created strong hydrogen bonds, improving impact energy dissipation and tensile strength for advanced soft protection applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Soft Robotics
Background:
- Soft elasticity in liquid crystal elastomers (LCEs) offers potential for impact absorption.
- Limitations include low strength and limited structural tunability, hindering practical applications.
Purpose of the Study:
- To develop 4D-printable LCEs with enhanced strength and programmable damping capabilities.
- To investigate the role of quadruple hydrogen bonds (HBs) in improving material properties.
Main Methods:
- Grafting the 2-ureido-4[1H]-pyrimidinone (UPy) motif into the LCE network.
- Utilizing direct ink writing (DIW) for 4D printing and UV curing for fixation.
- Characterizing impact energy-dissipation ratios and tensile strengths.
Main Results:
- Achieved impact energy-dissipation ratios up to 89.24%.
- Demonstrated anisotropic hysteresis under cyclic compression (R ≈ 53.8% parallel, R ≈ 28.8% perpendicular to director).
- Materials exhibited tensile strengths up to 9.4 MPa.
Conclusions:
- The developed UPy-LCEs offer high-performance, geometry-programmable energy absorption.
- The strategy integrates HB alignment locking with 4D-printable architectures for soft protection and damping.
- This work paves the way for advanced soft robotics and impact-absorbing interfaces.
