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    Synthesis and characterization of 6FDA/3,5-diamino-2,4,6-trimethylbenzenesulfonic acid-derived polyimide for gas separation applications

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    Sulfonated_PI_OCT15.2020.pdf
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    PDF
    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Abdulhamid, Mahmoud A.
    Genduso, Giuseppe
    Ma, Xiaohua
    Pinnau, Ingo cc
    KAUST Department
    Functional Polymer Membranes Group, Advanced Membranes and Porous Materials Center, Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
    Advanced Membranes and Porous Materials Research Center
    Physical Science and Engineering (PSE) Division
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Engineering Program
    KAUST Grant Number
    BAS/1/1323-01-01
    Date
    2020-10-23
    Online Publication Date
    2020-10-23
    Print Publication Date
    2021-02
    Embargo End Date
    2021-10-23
    Submitted Date
    2020-10-07
    Permanent link to this record
    http://hdl.handle.net/10754/665774
    
    Metadata
    Show full item record
    Abstract
    A sulfonic acid-functionalized trimethyl-substituted polyimide was synthesized by reacting 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 3,5-diamino-2,4,6-trimethylbenzenesulfonic acid (TrMSA). The properties of 6FDA-TrMSA were compared to the related 6FDA-derived polyimide analogues made from 2,4,6-trimethylbenzene-1,3-diamine (6FDA-TrMPD) and 3,5-diamino-2,4,6-trimethylbenzene benzoic acid (6FDA-TrMCA). Compared to 6FDA-TrMPD and 6FDA-TrMCA, sulfonic acid functionalization resulted in significantly lower surface area, reduced fractional free volume, and tighter chain d-spacing. Consequently, 6FDA-TrMSA displayed lower gas permeabilities with a commensurate increase in permeability-based gas-pair selectivities. The enhanced CO2/CH4 selectivity of 6FDA-TrMSA was caused exclusively by higher diffusion selectivity, which was promoted by strong hydrogen bonding induced by the [sbnd]SO3H functionalization. Permeation experiments of 6FDA-TrMSA with a 1:1 CO2-CH4 mixture revealed the occurrence of competitive sorption effects (depressing CO2 gas permeability) and CO2-induced polymer matrix plasticization, which reduced the polymer selectivity by enhancing CH4 permeability. At ~20 atm total pressure, 6FDA-TrMSA showed a CO2 permeability of ~15 Barrer and an equimolar CO2/CH4 mixed-gas selectivity of 55, which are ~2-fold higher performance values than those of the state-of-the-art polymer used for industrial scale natural gas sweetening, i.e., cellulose triacetate.
    Citation
    Abdulhamid, M. A., Genduso, G., Ma, X., & Pinnau, I. (2021). Synthesis and characterization of 6FDA/3,5-diamino-2,4,6-trimethylbenzenesulfonic acid-derived polyimide for gas separation applications. Separation and Purification Technology, 257, 117910. doi:10.1016/j.seppur.2020.117910
    Sponsors
    This work was supported by funding from King Abdullah University of Science and Technology (BAS/1/1323-01-01).
    Publisher
    Elsevier BV
    Journal
    Separation and Purification Technology
    DOI
    10.1016/j.seppur.2020.117910
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1383586620323832
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.seppur.2020.117910
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Engineering Program

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