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Polyimide aerogels cross-linked through amine functionalized polyoligomeric silsesquioxane.

Haiquan Guo1, Mary Ann B Meador, Linda McCorkle

  • 1Ohio Aerospace Institute, 22800 Cedar Point Road, Cleveland, Ohio, USA. haiquan.n.guo@nasa.gov

ACS Applied Materials & Interfaces
|February 8, 2011
PubMed
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Researchers developed novel polyimide aerogels using octa(aminophenyl)silsesquioxane (OAPS) cross-linkers. These lightweight, highly porous materials exhibit excellent thermal insulation and mechanical properties for diverse applications.

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Traditional aerogels often rely on silica, limiting their mechanical flexibility.
  • Polyimides offer excellent thermal and chemical stability but can be brittle.
  • Developing robust, flexible, and lightweight insulating materials is crucial for advanced applications.

Purpose of the Study:

  • To synthesize and characterize novel polyimide aerogels cross-linked with octa(aminophenyl)silsesquioxane (OAPS).
  • To evaluate the structural, thermal, and mechanical properties of these new aerogels.
  • To explore their potential applications in areas requiring high-performance insulation.

Main Methods:

  • Synthesis of polyamic acid solutions using 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), bisaniline-p-xylidene (BAX), and OAPS.

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  • Chemical imidization of the gels.
  • Drying using supercritical CO(2) extraction to produce aerogels.
  • Characterization of density, porosity, surface area, thermal conductivity, and mechanical modulus.

    • Main Results:

    • Successful synthesis of polyimide aerogels cross-linked with OAPS.
    • Achieved low density (approx. 0.1 g/cm(3)) and high porosity (>90%).
    • Exhibited high surface areas (230-280 m(2)/g) and low thermal conductivity (14 mW/m-K).
    • Demonstrated higher modulus compared to silica aerogels and flexibility in thin-film form.

    Conclusions:

    • OAPS is an effective cross-linker for creating high-performance polyimide aerogels.
    • These aerogels offer a unique combination of low density, high porosity, excellent thermal insulation, and mechanical robustness.
    • The flexibility of thin-film aerogels makes them suitable for aerospace and terrestrial insulation applications.