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Method For Synthesis of Poly (Ionic Liquid) Block Copolymers for Gas Separation

Date Posted
U.S. Patent Pending



Research is currently active on the patent pending technology titled, "Phase Segregated Poly(Ionic Liquid) Block Copolymers for Gas Separation." This technology is available for licensing and/or further collaborative research from the U.S. Department of Energy’s National Energy Technology Laboratory.


Ionic liquids possess high CO2 gas solubility compared to other gasses and are potentially important materials for gas removal applications. However, the liquid nature of ionic liquids in membrane application is a problem because it can lead to spillage and seepage. An alternative approach is to use poly(PILs). PILs in a block copolymer (BCP) architecture are excellent film formers that have potential for use in membrane applications.

This invention describes a simple and efficient synthesis methodology to produce a variety of phase-segregated PIL BCPs. Using PIL BCPs to control structure at the nanometer scale leads to higher permeability than that of standard PILs, which leads to more efficient transport of gases. This new synthesis approach can deliver a variety of architectures useful in many applications, such as ion transport and gas separation.

Ionic liquids possess high CO2 gas

  • Synthesis method reduces material development time
  • PILs can be used for applications where ionic liquids are not suitable due to their liquid nature
  • Solid electrolytes for batteries
  • Gas separation membranes for post-combustion carbon dioxide capture

Method For Synthesis of Poly (Ionic Liquid) Block Copolymers for Gas Separation

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