3D Printing Phosphonium Ionic Liquid Networks with Mask Projection Microstereolithography

Area of Science:

• Materials Science
• Polymer Chemistry
• Additive Manufacturing

Background:

• Polymerized ionic liquids (PILs) are advanced materials with tunable properties.
• 3D printing offers precise fabrication of complex structures.
• Developing PILs for specific applications like electro-active membranes requires tailored material properties.

Purpose of the Study:

• To develop a method for 3D printing phosphonium PILs with high resolution and controlled properties.
• To investigate the relationship between material composition and the performance of 3D printed PILs.
• To evaluate the suitability of these 3D printed PILs for electro-active membrane technologies.

Main Methods:

• Utilized photopolymerization and mask projection microstereolithography.
• Varied phosphonium monomer concentration, diacrylate cross-linker content, and digital display images.
• Characterized material properties including thermal stability, glass transition temperature, optical clarity, and ion conductivity.

Main Results:

• Successfully fabricated various 3D printed phosphonium PILs with high digital resolution and low UV light requirements.
• Achieved tunable properties such as thermal stability, glass transition temperature, and ion conductivity.
• Demonstrated a systematic increase in ion conductivity with higher ionic liquid monomer content.
• Confirmed the formation of a robust polymerized ionic liquid network with over 95% gel fraction.

Conclusions:

• 3D printing of phosphonium PILs is feasible using microstereolithography, enabling precise control over structure and properties.
• The resulting materials exhibit excellent thermal stability, optical clarity, and ion conductivity.
• These 3D printed PILs are highly promising for applications in electro-active membrane technologies.