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Porous Cross-Linked Polyimide-Urea NetworksPorous cross-linked polyimide-urea networks are provided. The networks comprise a subunit comprising two anhydride end-capped polyamic acid oligomers in direct connection via a urea linkage. The oligomers (a) each comprise a repeating unit of a dianhydride and a diamine and a terminal anhydride group and (b) are formulated with 2 to 15 of the repeating units. The subunit was formed by reaction of the diamine and a diisocyanate to form a diamine-urea linkage-diamine group, followed by reaction of the diamine-urea linkage-diamine group with the dianhydride and the diamine to form the subunit. The subunit has been cross-linked via a cross-linking agent, comprising three or more amine groups, at a balanced stoichiometry of the amine groups to the terminal anhydride groups. The subunit has been chemically imidized to yield the porous cross-linked polyimide-urea network. Also provided are wet gels, aerogels, and thin films comprising the networks, and methods of making the networks.
Document ID
20150004019
Acquisition Source
Glenn Research Center
Document Type
Other - Patent
Authors
Meador, Mary Ann B.
Nguyen, Baochau N.
Date Acquired
April 1, 2015
Publication Date
March 10, 2015
Subject Category
Chemistry And Materials (General)
Funding Number(s)
CONTRACT_GRANT: NNC07BA13B
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-Patent-8,974,903
Patent Application
US-Patent-Appl-SN-13/804,546

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