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- W2954038269 abstract "Polyimide gels are produced by cross-linking anhydride capped polyamic acid oligomers with aromatic triamine in solution and chemically imidizing. The gels are then supercritically dried to form nanoporous polyimide aerogels with densities as low as 0.14 g/cm3 and surface areas as high as 512 m2/g. To understand the effect of the polyimide backbone on properties, aerogels from several combinations of diamine and dianhydride, and formulated oligomer chain length are examined. Formulations made from 2,2′-dimethylbenzidine as the diamine shrink the least but have among the highest compressive modulus. Formulations made using 4,4′-oxydianiline or 2,2′dimethylbenzidine can be fabricated into continuous thin films using a roll to roll casting process. The films are flexible enough to be rolled or folded back on themselves and recover completely without cracking or flaking, and have tensile strengths of 4–9 MPa. Finally, the highest onset of decomposition (above 600 °C) of the polyimide aerogels was obtained usi..." @default.
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- W2954038269 date "2012-01-01" @default.
- W2954038269 modified "2023-09-24" @default.
- W2954038269 title "Mechanically Strong, Flexible Polyimide Aerogels Cross-Linked with Aromatic Triamine" @default.
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