Conversion of Soluble Polyimines to Covalent Organic Framework Films and Composites

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Covalent organic frameworks (COFs) show significant potential in various fields.
• Advanced processing techniques are needed for COF fabrication and composite synthesis.
• Existing methods often lack versatility for scalable COF production.

Purpose of the Study:

• To develop a versatile approach for synthesizing and processing imine-based COFs.
• To enable solution-based fabrication of COF films and composites.
• To demonstrate the scalability of COF synthesis and processing.

Main Methods:

• Synthesis of linear polyimines from diamines and dialdehydes.
• Exchange reactions with vertex amines to form imine-based COFs.
• Solution processing and vapor annealing for film fabrication.
• Incorporation of COFs with carbon nanotubes (CNTs) to form nanocomposites.

Main Results:

• High-crystallinity imine-based COFs were successfully synthesized.
• Soluble polyimine precursors allowed for solution-based processing and printing.
• Fabrication of COF films on microscopic and macroscopic scales was achieved.
• COF/CNT nanocomposites were synthesized using this straightforward approach.

Conclusions:

• The developed polyimine-based method offers a versatile route to high-crystallinity COFs.
• This approach facilitates solution-based processing and printing of COF materials.
• The method is scalable and enables the creation of advanced COF composites.