Synthesis and characterization of novel poly(ionic liquid)s and their viscosity-increasing effect

Three novel quaternary ammonium based poly(ionic liquid)s (PILs) were prepared and developed, expecting to increase the viscosity of liquid CO 2 (LCO 2 ). The Vinyl benzoate and various quaternary ammonium salts was used to provide CO 2 -philicity group and viscosity-increasing groups respectively. And the PILs products (TDBAS, HDBAS and SDBAS) were synthesized with three processes consisting of polymerization, sulfonation and ion exchange. The characterization results of gel permeation chromatography (GPC), nuclear magnetic resonance spectrum (NMR), fourier transform infrared spectrometer (FT-IR), element analysis (EA) and thermogravimetric analysis (TGA) confirmed the successful synthesis of the PILs. Based on the discussion of reverse micelle microstructures and interfacial tension of prepared PILs systems, the viscosity-increasing mechanisms of the prepared PILs were analyzed and explicated. The experimental results indicated that the HDBAS presented an outstanding viscosity-increasing effect and acceptable water solubility among all the PILs, which may have a prosperous prospect in the near future.