Method of aerogel synthesis

摘要

The present disclosure provides a method for producing an aerogel, the method comprising reacting at least one acid monomer with at least one diamino monomer in a first solvent under conditions appropriate to form a polyimide polymer; conducting a solvent exchange wherein the first solvent is exchanged for a second solvent, said second solvent having a freezing point, wherein said solvent exchange further comprises (1) submersing the polyimide polymer in the second solvent in a pressure vessel and (2) creating a high pressure environment inside the pressure vessel for a first period of time; cooling the polyimide polymer to a first temperature below the freezing point of the second solvent; and subjecting cooled polyimide polymer to a first vacuum for a second period of time at a second temperature.

主权项

1. A method of producing a polyimide aerogel, the method comprising:
(a) reacting at least one acid monomer with at least one diamino monomer in a reaction solvent to form a composition comprising a polyimide precursor polymer; (b) forming a polyimide gel; (c) conducting a solvent exchange process on the polyimide gel such that the resulting gel comprises an exchange solvent that includes a freezing point; (d) cooling the gel from step (c) to a temperature below the freezing point of the exchange solvent; and (e) subjecting the cooled gel to vacuum conditions to obtain the polyimide aerogel.