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Updated: Jul 29, 2025
Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
Published on: January 19, 2016
Fully Room Temperature Reprogrammable, Recyclable, and Photomobile Soft Actuators from Physically Cross-Linked
Shengkui Ma1, Lei Wang1, Yan Zhou1
1State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Functional Polymer Materials (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and College of Chemistry, Nankai University, Tianjin 300071, China.
Researchers developed novel azobenzene (azo) liquid crystalline polymers (LCPs) that are 3D shape-reprogrammable, recyclable, and photomobile at room temperature. These advanced polymers offer new possibilities for photoactuating applications due to their unique structure-property relationships.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Azobenzene (azo) polymers are promising for photoactuating applications but face challenges in achieving room-temperature 3D shape-reprogrammability, recyclability, and photomobility.
- Developing polymers with multiple functionalities, such as dynamic bonding and ordered phases, is crucial for advanced actuator design.
Purpose of the Study:
- To efficiently synthesize main-chain azo liquid crystalline polymers (LCPs) with room-temperature 3D shape-reprogrammability, recyclability, and photomobility.
- To investigate the influence of polymer backbone structure, including flexible spacer length and hydrogen bonding groups, on material properties and photoactuation behavior.
Main Methods:
- Michael addition polymerization was used to synthesize a series of poly(ester-amide-secondary amine)s (PEAsAs) with varying flexible spacer lengths.
- Uniaxial orientation of polymer fibers was achieved via melt spinning.
- Photoresponse, mechanical properties, shape reprogramming, and recyclability were characterized at room temperature (25 °C).
Main Results:
- The synthesized PEAsAs exhibited low glass transition temperatures (Tg ≤ 18.4 °C), ordered smectic liquid crystalline phases, and reversible photoresponsivity.
- Melt-spun fibers demonstrated good mechanical strength, reversible photoinduced bending/unbending, and significant stress generation at room temperature.
- Fibers were successfully reprogrammed into stable fiber springs with a distinct unwinding/winding photomobile mode at 25 °C and were recyclable from solution.
Conclusions:
- This work presents the first azobenzene LCPs demonstrating 3D shape reprogrammability, recyclability, and photomobility at room temperature.
- The study provides critical insights into the structure-property relationships governing the performance of these photodeformable polymers.
- The findings are valuable for designing next-generation photoactuating materials with tailored functionalities.
