Microporous polyimide sponge and method for producing the same
AssigneeIndustry-Academic Cooperation Foundation, Yonsei University
InventorsHaksoo HAN, Jinuk KWON, Jinyoung KIM
Life of this patent
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Abstract
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.
Claims25
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:
- wherein
- are 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.
A method for producing a polyimide sponge, comprising (A) polymerizing one or two dianhydrides with one or more diamines to obtain a polyamic acid solution and (B) heating a closed reactor in which a substrate surface coated with the polyamic acid solution is immersed in a liquid medium wherein the polyamic acid has a structure of Formula 1:
- wherein
- are 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.
A method for producing a polyimide sponge, comprising (A′) reacting one or more dianhydrides with one or more diamines to obtain a polyamic acid solution, (A″) adding one or more end-capping agents to the polyamic acid solution to end-cap the polyamic acid solution, and (B) heating a closed reactor in which a substrate surface coated with the end-capped polyamic acid solution is immersed in a liquid medium wherein the polyamic acid has a structure of Formula 1:
- wherein
- are 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.
A polyimide sponge having a structure of Formula 2:
- wherein
- are 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:
- are the same as or different from each other and each independently have the structure of Formula 6:
- 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.
Dependencies are inferred from the claim text.