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Self-Healable and Recyclable Dual-Shape Memory Liquid Metal-Elastomer Composites.
Xiaobo Deng1, Guokang Chen1, Yifan Liao2
1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
Polymers
|June 10, 2022
Summary
This study introduces a novel self-healable composite combining liquid metal and a dual-shape memory polyurethane elastomer. This material enables reconfigurable electronics and soft robotics with high recyclability.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Liquid metal (LM)-polymer composites offer combined conductivity and shape-morphing properties.
- Limited research exists on the synergistic effects between LMs and polymer matrices for shape-changing applications.
Purpose of the Study:
- To develop a self-healable and recyclable dual-shape memory composite using LM and a Diels-Alder (DA) crosslinked crystalline polyurethane (PU) elastomer.
- To investigate the synergetic shape-changing capabilities of LMs and polymer matrices.
Main Methods:
- Fabrication of a bilayer composite structure integrating liquid gallium (LM) and a crystalline PU elastomer with reversible DA crosslinks.
- Characterization of shape programming abilities based on LM phase transitions and PU elastomer's crystalline behavior.
Main Results:
- The composite demonstrated excellent shape programming, enabling a heat-triggered soft gripper and a light-controlled reconfigurable switch.
- The DA bonds facilitated self-healing and recyclability, achieving up to 96.7% LM recycling efficiency with preserved mechanical properties.
Conclusions:
- The developed LM-PU composite exhibits significant potential for advanced reconfigurable electronics and soft robotics.
- The material's self-healable, recyclable, and dual-shape memory characteristics highlight its sustainability and versatility.
