Preparation And Application Of Supramolecular Gels Based On (Poly) Ionic Liquids

Ionic liquids（ILs） are room temperature molten salts with negligible vapor pressure, high thermal stability, chemical stability, wide liquid range and ionic conductivity, and the ability to dissolve organic and inorganic solutes as well as tunable solvent properties. Ionic liquids（ILs） have been recently applied for rganic synthesis, separation, electrochemistry and polymers. Poly ionic liquid is a kind of ionic polymer which is produced by the polymerization of ionic liquid monomer, and it is a kind of anion and cation repeating unit. Polymerized ionic liquid（PILs） synthesized by polymerizing ionic liquid monomers, have a good performance of both polymer and ionic liquid, which can overcome the mobility of ionic liquid, so they have been widely used in the field of polymer science research in recent years. The functional supramolecular gels have been widely studied in the field of supramolecular materials. However,（poly）ionic liquids rarely have been reported in the field of functional supramolecular gel. Therefore, we first study the functional supramolecular gel based on（poly）ionic liquids, and further study its properties.The main research work is as the follows:（1） Ultrahigh ionic liquid content supramolecular ionogels were prepared via host-guest interactions between a host of b-CD and a guest of bis-imidazolium cation, Bis-C12（mim）Br, in a room temperature ionic liquid, 1-propyl-3-methylimidazolium iodide（PMII）. The driving force for the ionogel formation is primarily the host-guest interaction and intermolecular hydrogen bonding of imidazolium moieties. The prepared ionogels were further applied as the quasi-solid-state electrolytes for DSSCs, which showed a power conversion efficiency of 4.61% and an excellent long-term stability.（2） CO₂ Responsive Imidazolium-type Poly（ionic liquid） Gels were prepared via hydrogen bonding which were synthesized through free radical co-polymerization of imidazolium type IL monomer, and 2-（dimethyl amino） ethyl methacrylate（DMAEMA） using poly（ethylene glycol） diacrylate（PEG-DA, Mn≈600） as cross-linker. Upon bubbling with CO₂ gas, the prepared PIL solution was converted to a transparent and stable gel, which could be turned back to the initial solution state after N2 bubbling. These CO₂ responsive materials have potential applications in the field of delivery systems and smart biomaterial fields.