title: In situ Generation of Reticulate Micropores through Covalent Network/Polymer Nanocomposite Membranes for Reverse-Selective Separation of Carbon Dioxide.
abstract: We demonstrate the synthesis of a microporous covalent-network membrane derived from co-continuous blends of a porogenic urea network and a polyimide (PI). We show that the urea networks in the PI matrix may be thermally rearranged while selectively expelling small molecular fragments, thereby forming a new network bearing reticular microporous molecular pathways. The porous structures enable reverse-selective gas separation, efficiently blocking carbon dioxide to which most polymeric membranes exhibit selective permeability. The proposed method for fabricating microporous organic membranes with highly tunable porosities using a variety of chemical structures and processing parameters is facile and shows promise for the creation of new membrane-based molecular-separation techniques.
authors.affiliation: School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju, 61005, Korea.
authors.forename: Eunkyung
authors.initials: E
authors.lastname: Jeon
authors.affiliation: School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju, 61005, Korea.
authors.forename: Su-Young
authors.initials: SY
authors.lastname: Moon
authors.affiliation: School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju, 61005, Korea.
authors.forename: Jae-Sung
authors.initials: JS
authors.lastname: Bae
authors.affiliation: School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju, 61005, Korea. jiwoong@gist.ac.kr.
authors.forename: Ji-Woong
authors.identifier: http://orcid.org/0000-0002-8783-3675
authors.initials: JW
authors.lastname: Park
keywords: covalent networks; membranes; microporous materials; organic sol-gel synthesis; reverse-selective separation