Dual-function photoinitiator-metal organic frameworks as a modular platform for tuneable composites

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) offer advanced functionalities but suffer from poor processability and compatibility with photopolymers.
• Conventional photoinitiators (PIs) in composites can leach, causing cytotoxicity and compromising material integrity.

Purpose of the Study:

• To develop a novel dual-function photoinitiator-MOF (PI-MOF) platform for improved material fabrication and performance.
• To covalently graft photoinitiators onto MOF frameworks, transforming them into active polymerization sites.

Main Methods:

• Covalent grafting of photoinitiators to MOF frameworks (e.g., UiO-66).
• Utilizing PI-MOFs in photopolymerization for 3D laser writing applications.
• Evaluating the secondary function of PI-MOFs as selective adsorbents.

Main Results:

• Covalent immobilization of PIs prevented leaching and initiated polymerization from the MOF surface, strengthening interfaces.
• UiO-66-NPYG stabilized resins for high-fidelity 3D laser writing.
• UiO-66-Tz demonstrated enhanced selectivity for cationic dye adsorption.

Conclusions:

• The PI-MOF platform offers a modular approach to creating high-performance composites with integrated fabrication and function.
• This strategy overcomes limitations of passive MOF fillers and leachable PIs.
• PI-MOFs enable tunable secondary functions alongside improved material properties.