Liquid Crystal-Based Organosilicone Elastomers with Supreme Mechanical Adaptability

Area of Science:

• Materials Science
• Polymer Chemistry
• Soft Robotics

Background:

• Elastomers with high mechanical adaptability are crucial for applications like artificial muscles and soft robotics.
• Existing elastomers often struggle with increasing stress during continuous deformation.
• There is a need for materials that can compensate for external mechanical work internally.

Purpose of the Study:

• To develop a novel liquid crystal-based organosilicon elastomer (LCMQ) with supreme mechanical adaptability.
• To investigate the role of liquid crystal units and recoverable fillers in achieving this adaptability.
• To provide a new template for modifying organosilicon elastomers.

Main Methods:

• Synthesis of LCMQ using a novel liquid crystal-based crosslinking agent (MBB grafted thiol silicone oil) and vinyl terminated polydimethylsiloxane.
• Utilizing a two-step thiol-ene "click" reaction for synthesis.
• Incorporation of fumed silica as a reinforcing filler.

Main Results:

• The synthesized LCMQs exhibit significantly inhibited stress increase during large deformations.
• The material demonstrates recoverable elasticity and internal compensation for external mechanical work.
• Increased liquid crystal content (1-4% w/w) led to a clearer stress plateau, enhancing mechanical adaptability.
• The elastomer maintained stable properties across a temperature range of 25 °C to 120 °C.

Conclusions:

• A novel LCMQ was successfully synthesized, offering superior mechanical adaptability.
• The combination of liquid crystal phase transitions and nano-fillers is key to the material's performance.
• The developed LCMQ shows promise for industrial applications requiring stable mechanical properties over a wide temperature range.