Densities of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) p poly(ethylene glycol) [PEG] mixtures prepared with PEGs of average molecular weight 400 (PEG400), number-average molecular weight Mn 570 to 630 (PEG600), and number-average molecular weight Mn 950 to 1050 (PEG1000), respectively, have been measured over the entire composition regime in the temperature range (283.15 to 363.15) K at 10 K intervals using a density meter based on electromagnetically induced oscillations of a U-shaped glass tube and an in-built Peltier thermostat. The density of ([bmim][PF6]p[PEG]) mixtures at each composition for all three PEGs is found to decrease linearly with increasing temperature. The excess molar volumes (VE) of all the three ([bmim][PF6] p PEG) mixtures were observed to be negative at all temperatures and were correlated to the mole fraction of [bmim][PF6], X[bmim][PF6], in the mixture by Redlich-Kister-type equations. Importantly, the absolute values of VE for ([bmim][PF6] p PEG) mixtures appear to increase slightly with increasing temperature. These observations are attributed to the presence of complex interactions within the ([bmim][PF6] p PEG) mixtures. Specifically, they are proposed to have their origin in extensive intermolecular H-bonding involving the C2 hydrogen of [bmimp] and termini- OH as well as the ethoxy -O- of PEG within ([bmim][PF6] p PEG) mixtures.
Compounds
#
Formula
Name
1
C8H15F6N2P
1-butyl-3-methylimidazolium hexafluorophosphate
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.