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    Amphiphilic oligoether-based ionic liquids as functional materials for thermoresponsive ion gels with tunable properties via aqueous gelation

    Year: 2012

    Journal: Soft Matter 2012, 8 (4) pp 1025-1032, 20121211

    Authors: Josep Casamada Ribot , Carlos Guerrero-Sanchez , Tamar L. Greaves , Danielle F. Kennedy , Richard Hoogenboom and Ulrich S. Schubert

    Organizations: Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands; Ioniqa Technologies, Horsten 1, 5612 AX Eindhoven, The Netherlands; Dutch Polymer Institute (DPI), PO Box 902, 5600 AX Eindhoven, The Netherlands; CSIRO, Materials Science and Engineering Division, Bag 10, Clayton South MDC, 3169, Victoria, Australia; Laboratory of Organic and Macromolecular Chemistry (IOMC) and Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Humboldtstr. 10, D-07745 Jena, Germany.

    The aqueous gelation of an amphiphilic ammonium oligoether-based ionic liquid (AMMOENG 102) is addressed and compared to the gelation of a similar compound (AMMOENG 100) recently reported (J. Casamada Ribot, C. Guerrero-Sanchez, R. Hoogenboom and U. S. Schubert, J. Mater. Chem., 2010, 20, 8279.).1 The comparison is based on proton nuclear magnetic resonance spectroscopy, rheological, ionic conductivity, water uptake, differential scanning calorimetry, surface tension and small angle X-ray scattering investigations. The results demonstrate that slight changes in the chemical structure of these ionic liquids can have an important effect on the properties of their corresponding ion gels. Hence, this contribution provides an insight into the stability and formation mechanism of these new ion gels solely consisting of ionic liquid and water and expands the range of amphiphilic ionic liquids which can be utilized for the straightforward and inexpensive preparation of thermoresponsive materials with tunable properties (i.e., ionic conductivity and melting point) and high mechanical moduli.