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    Pristine and thermally-rearranged gas separation membranes from novel o-hydroxyl-functionalized spirobifluorene-based polyimides

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    Type
    Article
    Authors
    Ma, Xiaohua
    Salinas, Octavio cc
    Litwiller, Eric cc
    Pinnau, Ingo cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Chemical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2014-09-22
    Permanent link to this record
    http://hdl.handle.net/10754/563261
    
    Metadata
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    Abstract
    A novel o-hydroxyl-functionalized spirobifluorene-based diamine monomer, 2,2′-dihydroxyl-9,9′-spiro-bifluorene- 3,3′-diamine (HSBF), was successfully prepared by a universal synthetic method. Two o-hydroxyl-containing polyimides, denoted as 6FDA-HSBF and SPDA-HSBF, were synthesized and characterized. The BET surface areas of 6FDA-HSBF and SPDA-HSBF are 70 and 464 m2 g-1, respectively. To date, SPDA-HSBF exhibits the highest CO2 permeability (568 Barrer) among all hydroxyl-containing polyimides. The HSBF-based polyimides exhibited higher CO2/CH4 selectivity than their spirobifluorene (SBF) analogues (42 for 6FDA-HSBF vs. 27 for 6FDA-SBF) due to an increase in their diffusivity selectivity. Polybenzoxazole (PBO) membranes obtained from HSBF-based polyimide precursors by thermal rearrangement showed enhanced permeability but at the cost of significantly decreased selectivity.
    Citation
    Ma, X., Salinas, O., Litwiller, E., & Pinnau, I. (2014). Pristine and thermally-rearranged gas separation membranes from novel o-hydroxyl-functionalized spirobifluorene-based polyimides. Polym. Chem., 5(24), 6914–6922. doi:10.1039/c4py01221f
    Sponsors
    The authors acknowledge KAUST funding for Professor Ingo Pinnau.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    Polym. Chem.
    DOI
    10.1039/c4py01221f
    ae974a485f413a2113503eed53cd6c53
    10.1039/c4py01221f
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Engineering Program

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