Dynamic Ion Gels from the Complex Coacervation of Oppositely Charged Poly(ionic liquid)s.

A cationic poly(ionic liquid) (PIL) with pendent butyl imidazolium cations and free bis(trifluoromethylsulfonyl)imide (TFSI) anions and an anionic PIL with pendent TFSI anions and free 1-butyl-3-methylimidazolium cations are synthesized by postpolymerization chemical modification and reversible addition-fragmentation chain-transfer radical copolymerization, respectively. Upon mixing solutions of these two PILs in acetone with stoichiometric amounts of ion pairs, ionic exchanges induce coacervation and, after solvent evaporation, lead to the formation of a dynamic ion gel (DIG) and the concomitant release of free [1-methyl-3-butyl imidazolium]TFSI ionic liquid (IL). A comparison of thermal (), ion conducting (σ), and viscoelastic (elastic moduli (')) properties for DIGs and their parent polyelectrolytes, as well as extracted and IL-doped DIGs, demonstrates the formation of ionic cross-links and the ability to easily produce polymer electrolytes with enhanced ionic conductivity (σ up to 4.

Improved carbon dioxide absorption in double-charged ionic liquids.

Four divalent ionic liquids based on imidazolium cations with alkyl or ether functionalized side-chains were synthesised and characterized: 3,3'-(tetraethyleneglycol-1,11-diyl)bis(1-methyl-1-imidazolium)bromide, [tetraEG(mim)][Br], 3,3'-(tetraethyleneglycol-1,11-diyl)bis(1-methyl-1-imidazolium)acetate, [tetraEG(mim)][OAc], 1-butyl-3-methylimidazolium malonate, [Cmim][Mal], and 3-butyl-1-methylimidazolium glutarate, [Cmim][Glut]. Their densities vary between 1.1 and 1.

Probing the Reorganization of Ionic Liquids' Structure Induced by CO Sorption.

The sorption of CO is often used to modify the macroscopic properties of liquids and solids. In the particular case of ionic liquids, different from molecular liquids, the sorption of CO may not induce volume expansions due to the strong Coulombic interactions between the ions of the fluid. However, a considerable viscosity decrease has been systematically observed.

Using hydrogenated and perfluorinated gases to probe the interactions and structure of fluorinated ionic liquids.

After studying the properties of a mixture of hydrogenated and fluorinated ionic liquids we have measured the solubility of perfluoromethane, perfluoroethane and perfluoropropane in 1-alkyl-3-methylimidazolium based ionic liquids with hydrogenated or fluorinated alkyl side-chains: 1-octyl-3-methylimidazolium bis[trifluoromethylsulfonyl]amide ([C8C1Im][NTf2]), 1-octyl-3-methylimidazolium bis[pentafluoroethylsulfonyl]amide ([C8C1Im][BETI]), 1-(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)-3-methylimidazolium bis[trifluoromethylsulfonyl]amide ([C8H4F13C1Im][NTf2]), and 1-(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)-3-methylimidazolium bis[pentafluoroethylsulfonyl]amide ([C8H4F13C1Im][BETI]). The ionic liquids expand on mixing and mix endothermally with a relatively high enthalpy of mixing (ΔmixH for [C8C1Im]x[C8H4F13C1Im](1-x)[NTf2] of ca. 0.

Molecular dynamics simulations of polyethers and a quaternary ammonium ionic liquid as CO absorbers.

The properties of mixtures of butyltrimethylammonium bis(trifluoromethylsulfonyl)imide, [N][NTf], with poly(ethyleneglycol) dimethyl ether, PEO, were described as a function of PEO chain size by molecular dynamics simulations. Both PEO chain size and mixture composition revealed to play a significant role in determining the structure and the dynamics of the fluids. The remarkably higher viscosity observed for mixtures composed by 0.