Density, Viscosity and Conductivity of Tetra-alkyl Phosphonium Ionic Liquids

摘要

The density, viscosity and conductivity of nine commercially available tetra-alkyl phosphonium ionic liquids (ILs) are presented. The effect of cation volume and symmetry, anion volume, and temperature are observed. The Vogel-Tamman-Fulcher (VTF) equation is used to calculate the theoretical glass transition temperature (To) and the activation energy of conductivity EU]a. The conductivity of three halo-aluminate ionic liquid systems for mole fractions up to 0.7 AICI3 is reported.