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Effect of polyethylene glycol (PEG-400) on the 1-butyl-3-methylimidazolium tetrafluoroborate-in-cyclohexane ionic liquid microemulsion

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Abstract

The effect of a common polymer, polyethylene glycol with molecular weight of 400 (PEG-400) on the microstructure of 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF4)/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 bmimBF4. 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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Acknowledgments

The authors are grateful to the National Natural Science Foundation of China (No.20773081), National Basic Research Program (2007CB808004), the Natural Scientific Foundation of Shandong Province of China (Z2007B06). This work was partially supported by the Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, TIPC, CAS.

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Authors and Affiliations

  1. Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, China

    Na Li, Shaohua Zhang, Xinwei Li, Li Yu & Liqiang Zheng

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  1. Na Li
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  2. Shaohua Zhang
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  3. Xinwei Li
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  4. Li Yu
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  5. Liqiang Zheng
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Correspondence to Liqiang Zheng.

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Li, N., Zhang, S., Li, X. et al. Effect of polyethylene glycol (PEG-400) on the 1-butyl-3-methylimidazolium tetrafluoroborate-in-cyclohexane ionic liquid microemulsion. Colloid Polym Sci 287, 103–108 (2009). https://doi.org/10.1007/s00396-008-1946-3

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  • DOI: https://doi.org/10.1007/s00396-008-1946-3

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