High-Performance Self-Cross-Linked PGP-POEM Comb Copolymer Membranes for CO2 Capture

Na Un Kim, Byeong Ju Park, Yeji Choi, Ki Bong Lee, Jong Hak Kim

    Research output: Contribution to journalArticlepeer-review

    28 Citations (Scopus)

    Abstract

    We report a high performance CO2 capture membrane based on the copolymerization and self-cross-linking of poly(glycidyl methacrylate-g-poly(propylene glycol))-co-poly(oxyethylene methacrylate) (PGP-POEM) comb copolymer. The epoxide-amine reaction is responsible for the self-cross-linking reaction, which takes place under mild conditions without any additional cross-linkers or catalysts. The effects of self-cross-linking on the membrane properties are investigated by comparing the copolymers with those containing a low PPG grafting density (l-PGP-POEM). Furthermore, the gas separation performance of the membranes is systematically investigated as a function of POEM content in the comb copolymer. Both the permeance and selectivity of the PGP-POEM membranes are enhanced simultaneously with increase in the POEM content up to 51.2 wt % (PGP-POEM13), at which the best performance was achieved among the membranes. The high performance results from the reduced diffusion of N2 due to the self-cross-linked structure as well as the increased CO2 solubility due to the high content of ether oxygen groups in the comb copolymer. By optimizing the membrane thickness, the performance is further improved up to a CO2 permeance of 500 GPU (1 GPU = 10-6 cm3 (STP)/(s cm2 cmHg)) and CO2/N2 selectivity of 22.4, which is close to the commercialization target area of CO2 capture membranes. This work suggests a simple and economical cross-linking method to fabricate the membranes with excellent gas separation performance.

    Original languageEnglish
    Pages (from-to)8938-8947
    Number of pages10
    JournalMacromolecules
    Volume50
    Issue number22
    DOIs
    Publication statusPublished - 2017 Nov 28

    Bibliographical note

    Funding Information:
    This work was supported by a National Research Foundation (NRF) grant funded by the Ministry of Science, ICT, and Future Planning (NRF-2017R1A4A1014569, NRF-2017M1A2A2043448, NRF-2017K1A3A1A16069486) and the Human Resources Program in Energy Technology (20154010200810) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP).

    Funding Information:
    This work was supported by a National Research Foundation (NRF) grant funded by the Ministry of Science, ICT, and Future Planning (NRF-2017R1A4A1014569, NRF- 2017M1A2A2043448, NRF-2017K1A3A1A16069486) and the Human Resources Program in Energy Technology (20154010200810) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP).

    ASJC Scopus subject areas

    • Organic Chemistry
    • Polymers and Plastics
    • Inorganic Chemistry
    • Materials Chemistry

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