Polyamide/polyimide aerogels

Patent metadata

Field	Value
Publication number	US-10066073-B1
Application number	US-201615251317-A
Country	US
Kind code	B1
Filing date	Aug 30, 2016
Priority date	Aug 30, 2016
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

An aerogel and method of making the aerogel is disclosed. The aerogel is a polyimide/polyamide hybrid with a cross-linking agent that induces gelation.

First claim

What is claimed is:

1. A method of creating a polyamide/polyimide aerogel comprising:
preparing a solution including at least one dianhydride and at least one diamine in a first solvent;
adding at least one polyamide oligomer to the solution;
adding a cross-linking agent to the solution;
allowing the solution to become a gel; and
subjecting the gel to supercritical drying.

2. The method of claim 1 , wherein prior to adding the at least one polyamide oligomer to the solution, the method further comprising stirring the solution for a first time period.

3. The method of claim 2 , wherein after adding the at least one polyamide oligomer to the solution, the method further comprising stirring the solution for a second time period.

4. The method of claim 3 , wherein after stirring the solution for a second time period, the method further comprising adding a base and a reagent to the solution thereby facilitating chemical reactions.

5. The method of claim 4 , wherein after adding a base and a reagent to the solution thereby facilitating chemical reactions, the method further comprising stirring the solution for a third time period.

6. The method of claim 5 , wherein after adding a cross-linking agent to the solution, the method further comprising pouring the solution into molds, aging the gels for a fourth time period, and removing the gels from the molds.

7. The method of claim 4 , wherein after adding a cross-linking agent to the solution, the method further comprising stirring the solution for a third time period, pouring the solution into a mold, aging the gel for a fourth time period, and removing the gel from the mold.

8. The method of claim 3 , wherein prior to subjecting the gel to supercritical drying, the method further including placing the gel in a second solvent that is miscible with liquid carbon dioxide and exchanging the second solvent at least one time to remove the first solvent.

9. The method of claim 8 further comprising placing the gel in a supercritical drying chamber, exchanging a third solvent in the supercritical drying chamber with the liquid carbon dioxide, heating the supercritical drying chamber to a critical point of the liquid carbon dioxide, and venting the supercritical drying chamber.

Assignees

• Nasa
• The Us Administrator Of National Aeronautics And Space Administration

Inventors

• Williams Jarrod C
• Meador Mary Ann B

Classifications

• C08G73/1042

  Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds · CPC title

• C08J2201/026

  Crosslinking before of after foaming · CPC title

• C08J9/286 Primary

  the liquid phase being a solvent for the monomers but not for the resulting macromolecular composition, i.e. macroporous or macroreticular polymers · CPC title

• C08J2201/0502

  the liquid phase being organic · CPC title

• C08J2379/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title