4.7 Article

Ladder polymers of intrinsic microporosity from superacid-catalyzed Friedel-Crafts polymerization for membrane gas separation

Journal

JOURNAL OF MEMBRANE SCIENCE
Volume 644, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.memsci.2021.120115

Keywords

Polymer of intrinsic microporosity; Ladder polymers; Gas separation membrane; Superacid-catalyzed polymerization; Nature gas sweetening

Funding

  1. Dalian National Laboratory for Clean Energy (DNL) Cooperation Fund of CAS [DNL201917]
  2. Hebei Natural Science Foundation [B2020103009]
  3. Beijing Nova Program of Science and Technology [Z191100001119107]
  4. International Partner Program of CAS [122111KYSB20200035]
  5. National Natural Science Foundationof China [22008243, 22090063]

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Polymers of intrinsic microporosity with unique and tunable structures are suitable for efficient gas separation and have potential applications.
Polymers of intrinsic microporosity have attracted comprehensive attention in membrane-mediated gas separation because of their rigid and contorted structure that facilitates well-defined microporosity for fast and selective gas transport. We report a new macromolecular design synthesizes semi-ladder and fully-ladder polymers of intrinsic microporosity containing 9H-xanthene units by superacid-catalyzed Friedel-Crafts polymerization named SACPs. The prepared SACP membranes display high microporosity with amorphous chain packing structure, high FFV, and high BET surfaces areas. In particular, SACP-3 exhibited the most elevated BET surfaces area of 568 m(2)/g, fractional free volume (FFV) of 0.243, and bimodal micropore size distribution with two maxima at similar to 5 and similar to 8 angstrom, respectively. Due to its fully ladder architecture, SACP-3 exhibits highly permeable gas transport with CO2 permeability of 6497 Barrer and CO2/CH4 selectivity of 7.8, respectively. The microporosity and gas permeation properties of SACP membranes are also demonstrated to be highly tailorable by employing different monomers. The facile polymerization procedure, excellent solubility and processability, highly diverse tunability, and outstanding gas separation performance render SACP membranes attractive for many membrane mediated gas separation processes.

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