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Poly(ionic liquid)s with Dicationic Pendants as Gas Separation Membranes.

Sudhir Ravula1, Kathryn E O'Harra1, Keith A Watson2

  • 1Department of Chemical & Biological Engineering, University of Alabama, Tuscaloosa, AL 35487, USA.

Membranes
|March 24, 2022
PubMed
Summary

New norbornene-containing ionic liquid block copolymers were synthesized for gas separation membranes. These materials show tunable properties and a trade-off between CO2 permeability and selectivity.

Keywords:
ROMPblock copolymersgas separationsmembranesnorbornenepoly(ionic liquids)

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Membrane Technology

Background:

  • Poly(norbornene)s and poly(ionic liquid)s are studied for gas separation membranes due to tunable structures and thermal stability.
  • Incorporating ionic liquids into poly(norbornene)s yields synergistic properties, but direct polymerization of norbornene-containing ionic liquid monomers is limited.

Purpose of the Study:

  • To synthesize and characterize novel norbornene-containing ionic liquid monomers and their corresponding polymers.
  • To investigate the gas separation performance of these novel polymer membranes, focusing on block copolymers.

Main Methods:

  • Synthesis of norbornene-containing imidazolium-based mono- and di-cationic ionic liquids (NBM-mIm and NBM-DILs).
  • Ring-opening metathesis polymerization using Grubbs' catalyst to form homo-, random-, and block copolymers.
  • Characterization using 1H-NMR, GPC, and WAXD.
  • Fabrication of thin membranes and measurement of gas permeation (CO2, N2, CH4, H2) using a time-lag apparatus.

Main Results:

  • High molecular weight block copolymers ([NBM-mIM][Tf2N] and [NBM-ImCn mIm][Tf2N]2) with good solubility were synthesized.
  • Gas permeation studies revealed modest CO2 permeability and a reverse trend in CO2/N2 permselectivity with composition.
  • Observed trade-off behavior between permeability and permselectivity in the block copolymers.

Conclusions:

  • Successfully synthesized and characterized novel norbornene-containing ionic liquid block copolymers.
  • Demonstrated the potential of these materials for gas separation applications, highlighting tunable properties.
  • Addressed the limitations of direct polymerization for such materials, paving the way for future research.