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Title: Temperature dependent densities of mixtures of 1-butyl-3-methylimidazolium hexafluorophosphate + poly(ethylene glycol)
Authors: Trivedi, Shruti
Pandey, Siddharth
Keywords: Ionic liquids
Excess properties
Issue Date: Jun-2010
Publisher: CSIR
Abstract: Densities of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) + poly(ethylene glycol) (average molar mass 200 g mol–1) [PEG200] mixtures have been measured over the entire composition regime in the temperature range of 283.15–363.15 K at 10 degree intervals, using a density meter based on electromagnetically induced oscillations of a U-shaped glass tube and an inbuilt Peltier thermostat. The density versus temperature data of [bmim][PF6] + PEG200 mixtures at each composition have been fitted to a simple linear equation : . The fits are observed to be satisfactory at each composition. The excess molar volumes of  [bmim][PF6] + PEG200 mixtures are observed to be negative and significant over the entire composition range. Irrespective of the temperature, the maximum absolute excess molar volumes are observed in PEG-rich region at X[bmim][PF6] ~ 0.3. Importantly, the absolute values of excess molar volumes for [bmim][PF6] + PEG200 mixtures appear to increase slightly with increasing temperature.  These observations are attributed to the presence of strong interactions within the [bmim][PF6] + PEG200 mixtures.  Specifically, they are proposed to be due to the presence of extensive intermolecular H-bonding involving C2 hydrogen of [bmim+] and termini –OH as well as ethoxy –O– of PEG200 within [bmim][PF6] + PEG200 mixtures.
Page(s): 731-735
Source:IJC-A Vol.49A(05-06) [May-June 2010]

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