4D Printing of High-Performance Thermal-Responsive Liquid Metal Elastomers Driven by Embedded Microliquid Chambers

Area of Science:

• Materials Science
• Polymer Science
• Additive Manufacturing

Background:

• Four-dimensional (4D) printing utilizes swellable materials for shape-morphing architectures.
• Limited variety in high-performance swellable materials hinders 4D printing development.

Purpose of the Study:

• To design high-performance thermal-responsive swellable materials for 4D printing.
• To overcome limitations in existing swellable materials for advanced applications.

Main Methods:

• Developed a novel elastomer incorporating reversible liquid-vapor phase change chambers and liquid metal fillers.
• Investigated the thermal-responsive properties, including stability, response speed, and deformation.
• Fabricated and analyzed bilayer structures using the developed material to demonstrate shape morphing capabilities.

Main Results:

• The designed elastomer exhibits reversible thermal-responsive swelling with high stability and fast response.
• Liquid metal fillers enhance thermal conductivity, fracture toughness, and reduce stiffness, improving performance.
• Adjustable response speed and equilibrium deformation were achieved by modifying design parameters.

Conclusions:

• The proposed material system offers a new approach for 4D printing complex, shape-morphing architectures.
• This advancement expands the possibilities for creating sophisticated functional structures using 4D printing technology.