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    Effect of the Amide Bond Diamine Structure on the CO 2 , H 2 S, and CH 4 Transport Properties of a Series of Novel 6FDA-Based Polyamide–Imides for Natural Gas Purification

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    Type
    Article
    Authors
    Vaughn, J.
    Koros, W. J.
    KAUST Grant Number
    KUS-I1-011-21
    Date
    2012-08-21
    Online Publication Date
    2012-08-21
    Print Publication Date
    2012-09-11
    Permanent link to this record
    http://hdl.handle.net/10754/598063
    
    Metadata
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    Abstract
    A series of higher permeability polyamide-imides based on 2,2′-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride with comparable plasticization resistance to Torlon were synthesized and formed into dense film membranes. Polymers possessing 2,4-diamino mesitylene (DAM) were stable up to 56 atm of pure CO 2, which is due to enhanced charge transfer complex formation compared to polymers containing 4,4′- (hexafluoroisopropylidene) dianiline (6FpDA) and 2,3,5,6-tetramethyl-1,4- phenylenediamine (TmPDA). The new polymers containing DAM and TmPDA showed ideal CO 2/CH 4 selectivities of near 50 with CO 2 and H 2S permeabilities over an order of magnitude higher than Torlon. CO 2 and CH 4 sorption in the DAM- and TmPDA-based materials was reduced, whereas H 2S sorption was enhanced relative to membranes containing fluorinated 6FpDA. Consequently, DAM- and TmPDA-based membranes showed increased stability toward high pressure CO 2 but lower plasticization resistance toward pure H 2S. These results highlight the differences between CO 2 and H 2S that challenge the rational design of materials targeting simultaneous separation of both contaminants. © 2012 American Chemical Society.
    Citation
    Vaughn J, Koros WJ (2012) Effect of the Amide Bond Diamine Structure on the CO 2 , H 2 S, and CH 4 Transport Properties of a Series of Novel 6FDA-Based Polyamide–Imides for Natural Gas Purification . Macromolecules 45: 7036–7049. Available: http://dx.doi.org/10.1021/ma301249x.
    Sponsors
    This publication is based on work supported by Award No. KUS-I1-011-21, made by King Abdullah University of Science and Technology (KAUST). The authors would also like to thank Dr. JR Johnson and Dr. Oguz Karvan (Ga. Tech.) for design and construction of the H<INF>2</INF>S systems as well as Megan Lydon (Ga. Tech.) for assistance in the XRD measurements.
    Publisher
    American Chemical Society (ACS)
    Journal
    Macromolecules
    DOI
    10.1021/ma301249x
    ae974a485f413a2113503eed53cd6c53
    10.1021/ma301249x
    Scopus Count
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    Publications Acknowledging KAUST Support

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