The synthesis of a new ionic liquid-type monomer has been performed by association of a methacrylate polymerizable group, a polar tri(ethylene oxide) (TEO) spacer, a trifluoromethane sulfonic (TFSI − ) anion and a free imidazolium (EMIm + ) cation. The ionic liquid monomer (ILM) has demonstrated a good thermal stability and a high ionic conductivity around 2.1×10 −3 Scm −1 at 20°C. The corresponding homopolymer has shown an ionic conductivity closely related to the monomer (6.5×10 −4 Scm −1 at 20°C), which confirms the ILM as a valuable monomer for the formation of polymeric ionic liquid (PIL) materials.