MICROPOROUS POLYIMIDE SPONGE AND METHOD FOR PRODUCING THE SAME

摘要

Disclosed is a net-shaped polyimide sponge. The polyimide sponge has a stack structure of nets. Also disclosed is a method for producing a polyimide sponge. The method enables the production of a polyimide sponge in a simple manner compared to conventional methods based on wet or dry phase inversion techniques using porogens.

主权项

1. A method for producing a polyimide sponge, comprising (B) heating a closed reactor in which a substrate surface coated with a polyamic acid solution is immersed in a liquid medium wherein the polyamic acid has a structure of Formula 1: whereinare the same as or different from each other and each independently have one of the structures of Formulae 3a to 3f: -A2- and -A4- are the same as or different from each other and each independently have one of the structures of Formulae 4a to 4j: —X1 and —X2 are the same as or different from each other and each independently have one of the structures of Formulae 5a to 5d: both n1 and n4 are 0 or 1, and n2 and n3 are the same as or different from each other and are each independently an integer from 0 to 10,000, with the proviso that at least one of n2 and n3 is not zero.