Colorless and Transparent Semialicyclic Polyimide Aerogels with Mechanical Durability for Thermal Insulation

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Aerogel insulators require visible-light transparency, low thermal conductivity, and high mechanical resistance.
• Aromatic polyimide aerogels offer mechanical strength but lack transparency and optimal thermal insulation.
• Achieving all desired properties simultaneously in a single aerogel remains a significant challenge.

Purpose of the Study:

• To develop colorless and transparent aerogels with low thermal conductivity and high mechanical resistance.
• To explore the potential of semialicyclic polyimides for advanced transparent thermal insulation applications.

Main Methods:

• Strategic monomer design for semialicyclic polyimides.
• A novel imidization process to achieve reliable sol-gel transitions.
• Characterization of aerogel properties including transparency, mechanical strength, and thermal conductivity.

Main Results:

• Successfully synthesized colorless and transparent semialicyclic polyimide aerogels.
• Aerogels exhibit high bending strength, flexibility, and thermal decomposition temperature (~450 °C).
• Optimized aerogel achieved a low thermal conductivity of 27 mW m^-1 K^-1.

Conclusions:

• Semialicyclic polyimide aerogels possess unprecedented characteristics for transparent thermal insulation.
• These materials present a promising solution for applications requiring simultaneous transparency, mechanical robustness, and thermal insulation.