Water co-catalyst for polyimide process

Patent metadata

Field	Value
Publication number	US-2024254301-A1
Application number	US-202418435183-A
Country	US
Kind code	A1
Filing date	Feb 7, 2024
Priority date	Dec 11, 2020
Publication date	Aug 1, 2024
Grant date	—

Abstract

The present disclosure is directed to methods of forming polyimide gels. The methods generally include forming a polyamic acid and dehydrating the polyamic acid with a dehydrating agent in the presence of water. The resulting polyimide gels may be converted to polyimide or carbon xerogels or aerogels. The methods are advantageous in providing rapid or even instantaneous gelation, which may be particularly useful in formation of beads comprising the polyimide gels. Polyimide or carbon gel materials prepared according to the disclosed method are suitable for use in environments containing electrochemical reactions, for example as an electrode material within a lithium-ion battery.

First claim

1 - 41 . (canceled)

42 . A polyimide wet-gel comprising residual water.

43 . The polyimide wet-gel of claim 42 , wherein the residual water is present in a molar ratio of the water to the polyimide of about 5 or greater.

44 . The polyimide wet-gel of claim 42 , wherein the residual water is present in a molar ratio of the water to the polyimide from about 5 to about 500.

45 . The polyimide wet-gel of claim 42 , in the form of a monolith.

46 . The polyimide wet-gel of claim 45 , wherein the monolith has a thickness from about 5 to about 25 mm.

47 . The polyimide wet-gel of claim 45 , wherein the monolith is a film having a thickness from about 50 microns to about 1 mm.

48 . The polyimide wet-gel of claim 42 , in the form of beads having a diameter from about 5 microns to about 200 microns.

49 . The polyimide wet-gel of claim 42 , wherein the wet-gel is doped with silicon.

50 . The polyimide wet-gel of claim 49 , wherein the silicon is present in the form of wires, crystalline silicon, amorphous silicon, silicon alloys, silicon oxides (SiO x ), coated silicon, or combinations thereof.

51 . The polyimide wet-gel of claim 49 , wherein the silicon is present in the form of substantially planar flakes.

52 . The polyimide wet-gel of claim 49 , wherein the silicon is present in the form of particles which are substantially spherical, cubic, obloid, elliptical, disk-shaped, or toroidal.

53 . A nanoporous gel material comprising a pore structure, the pore structure comprising a fibrillar morphology and an array of pores, wherein the nanoporous gel material is a polyimide aerogel or is a carbon aerogel derived from a polyimide aerogel by carbonization, and wherein a corresponding polyimide wet-gel, prior to any drying, comprises water in a molar ratio of the water to the polyimide of about 5 or greater.

54 . The nanoporous aerogel material of claim 53 , wherein the nanoporous aerogel material is a polyimide aerogel.

55 . The nanoporous aerogel material of claim 53 , wherein the nanoporous aerogel material is a carbon aerogel derived from a polyimide aerogel by carbonization.

56 . The nanoporous aerogel material of claim 53 , wherein the corresponding polyimide wet-gel, prior to any drying, comprises water in a molar ratio of the water to the polyimide in a range from about 5 to about 500.

Assignees

• Aspen Aerogels Inc

Inventors

• Begag Redouane
• Trifu Roxana
• Zafiropoulos Nicholas A
• Miller Harris R
• Gould George L
• Leventis Nicholas

Classifications

• C08K2201/007

  Fragrance additive · CPC title

• C08K3/36

  Silica · CPC title

• C08J3/075

  Macromolecular gels · CPC title

• C08K5/3432

  Six-membered rings · CPC title

• C08K5/09

  Carboxylic acids; Metal salts thereof; Anhydrides thereof · CPC title