3D Printed Silicones with Shape Morphing and Low-Temperature Ultraelasticity

Area of Science:

• Materials Science and Engineering
• Additive Manufacturing
• Polymer Chemistry

Background:

• 3D printed silicones offer design flexibility but lack low-temperature performance data.
• Critical applications in polar and space environments require materials that maintain functionality at sub-zero temperatures.

Purpose of the Study:

• To develop a 3D printed silicone foam with enhanced low-temperature elasticity.
• To investigate the material's performance under extreme compression and cyclic loading at low temperatures.
• To explore a novel shape morphing strategy for 3D printed silicone materials.

Main Methods:

• Direct writing of a phenyl silicone-based ink containing sodium chloride as a sacrificial template.
• Pore formation via water immersion, inducing osmotic pressure-driven shape morphing.
• Characterization of mechanical properties, including elasticity, fatigue resistance, and energy absorption down to -60 °C.

Main Results:

• Achieved unprecedented low-temperature elasticity in a 3D printed silicone foam down to -60 °C.
• Demonstrated extraordinary fatigue resistance (over 66,000 cycles) and shape recovery under extreme compression.
• Reported a novel osmotic pressure-driven shape morphing strategy, offering an alternative to hydrogels.

Conclusions:

• The developed 3D printed silicone foam overcomes limitations in low-temperature performance for silicone materials.
• The material's robust mechanical properties and shape morphing capability make it suitable for demanding applications.
• The study provides detailed insights into the mechanisms governing shape morphing and low-temperature elasticity.