CO2 Responsive Imidazolium‐Type Poly(Ionic Liquid) Gels

Poly(ionic liquid) (PIL) gels with CO 2 stimulus responsiveness have been synthesized through the copolymerization of an imidazolium‐type ionic liquid monomer with 2‐(dimethyl amino) ethyl methacrylate. Upon bubbling with CO 2 gas, the prepared PIL solution is converted to a transparent and stable gel, which can be turned back to the initial solution state after N 2 bubbling. The reversible sol–gel phase transition behavior is proved by the reversible values of viscosity and ionic conductivity. The possible mechanism for such a reversible sol–gel phase transition is demonstrated by NMR, conductivity, and rheological measurements. image