Polyimide aerogels with three-dimensional cross-linked structure
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorMary Ann B. Meador
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Abstract
A method for creating a three dimensional cross-linked polyimide structure includes dissolving a diamine, a dianhydride, and a triamine in a solvent, imidizing a polyamic acid gel by heating the gel, extracting the gel in a second solvent, supercritically drying the gel, and removing the solvent to create a polyimide aerogel.
Claims10
An aerogel consisting of a porous cross-linked polyimide network comprising a plurality of anhydride end-capped polyamic acid oligomers, wherein the oligomers (i) comprise oligomers having repeating units of a dianhydride and a diamine that have terminal anhydride groups, (ii) are cross-linked after the oligomers are formed via a cross-linking agent, comprising three or more amine groups, at a balanced stoichiometry of the amine groups to the terminal anhydride groups, and (iv) have been imidized to yield the porous cross-linked polyimide network.
Dependencies are inferred from the claim text.