Constructing novel hyper-crosslinked conjugated polymers through molecular expansion for enhanced gas adsorption...

Area of Science:

• Materials Science
• Polymer Chemistry
• Environmental Science

Background:

• Porous organic polymers are crucial for gas storage and adsorption.
• Covalent triazine frameworks (CTFs) offer potential but require structural enhancement.

Purpose of the Study:

• To synthesize novel hyper-cross-linked conjugated polymers (HCCPs) with high surface area.
• To enhance the adsorption capacity and gas storage of CTFs.

Main Methods:

• Synthesized nitrogen-rich CTFs via polycondensation.
• Expanded CTF layers using Friedel-Crafts reaction with specific bis(chloromethyl)benzene derivatives.
• Characterized the resulting HCCPs for surface area, pore volume, and adsorption properties.

Main Results:

• HCCPs exhibited significantly increased specific surface area and pore volume compared to CTF-HUST.
• HCCP2-1.25 showed high adsorption capacities for various volatile organic compounds (VOCs), including ethyl acetate, ethanol, 1,2-dichloroethane, benzene, and toluene.
• Enhanced CO2 and H2 storage capacities were observed in HCCP2-1.25.

Conclusions:

• A simple molecular expansion strategy effectively created high-surface-area porous polymers.
• The developed HCCPs demonstrate excellent potential for environmental applications, particularly in VOC adsorption and gas storage.