Journal
COLLOID AND POLYMER SCIENCE
Volume 287, Issue 1, Pages 103-108Publisher
SPRINGER
DOI: 10.1007/s00396-008-1946-3
Keywords
Microemulsion; Ionic liquid; Polyethylene glycol; Dynamic light scattering; Conductivity; Viscosity; FTIR spectroscopy
Categories
Funding
- National Natural Science Foundation of China [20773081]
- National Basic Research Program [2007CB808004]
- Natural Scientific Foundation of Shandong Province of China [Z2007B06]
- Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering
- TIPC
- CAS
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The effect of a common polymer, polyethylene glycol with molecular weight of 400 (PEG-400) on the microstructure of 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF(4))/Triton X-100/cyclohexane ionic liquid (IL) reverse microemulsion has been investigated. The addition of PEG-400 leaded to the linear increase of the microemulsion droplet size, in accordance with the observation of dispersed phase, showing that PEG-400 was only solubilized into the polar interior of the IL microemulsions. FTIR spectroscopic analysis indicated that the addition of PEG-400 decreased the electrostatic interaction between the oxygen atoms of OE units and the positive electrical charged imidazolium cation of bmimBF(4). At the same time, the oxygen atoms of PEG-400 can also interact with the imidazolium cation. These results suggested that small amounts of PEG-400 entered the palisade layers of the IL microemulsion. The conductivity of the IL reverse microemulsions was decreased owing to the dilution of conducting polar cores by the addition of insulative PEG-400, indicating that PEG-400 was only solubilized into the reverse IL microemulsion interior. The conclusion was further supported by viscosity measurement.
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