Mechanically strong polyimide aerogels cross-linked with low-cost polymers

Area of Science:

• Materials Science
• Polymer Chemistry

Background:

• Polyimide aerogels are advanced materials with desirable properties.
• Traditional synthesis methods often rely on expensive small molecule cross-linkers, limiting widespread application.
• Developing cost-effective alternatives is crucial for broader industrial adoption.

Purpose of the Study:

• To synthesize polyimide aerogels using low-cost polyamide oligomers as cross-linking agents.
• To investigate the impact of anhydride density and cross-linker structure on aerogel properties and microstructure.
• To establish these novel cross-linkers as viable, economical alternatives to conventional ones.

Main Methods:

• Preparation of polyimide aerogels utilizing polymers with structure-capped polyamide oligomers.
• Synthesis of two polymer types from maleic anhydride, endic anhydride, and styrene via radical polymerization.
• Characterization of aerogel properties including density, specific surface area, and mechanical modulus.

Main Results:

• Achieved low polyimide aerogel densities as low as 0.087 g cm^-3.
• Obtained high specific surface areas up to 456 m² g^-1.
• Demonstrated a maximum modulus of 21.3 MPa, indicating robust mechanical performance.

Conclusions:

• The developed polyimide aerogels offer competitive properties at a reduced cost.
• The novel cross-linkers are effective and economical alternatives to expensive small molecule cross-linkers.
• This research paves the way for more affordable production of high-performance polyimide aerogels.