Microwave-Assisted Homogeneous Polymerizations in Water-Soluble Ionic Liquids: An Alternative and Green Approach for Polymer Synthesis

Authors

  • Carlos Guerrero-Sanchez,

    1. Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
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  • Matthias Lobert,

    1. Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
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  • Richard Hoogenboom,

    1. Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
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  • Ulrich S. Schubert

    Corresponding author
    1. Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
    • Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands. Fax: +31 40 247 4186
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Abstract

Water-soluble ionic liquids (IL) were used as reaction media to perform homogeneous polymerizations under microwave irradiation. The investigated reaction systems include the free radical polymerization of methyl methacrylate and the cationic ring opening polymerizations of 2-phenyl-2-oxazoline and 2-(m-difluorophenyl)-2-oxazoline. The incorporation of ILs into the polymerizations showed a more efficient heating profile of the reaction mixtures under microwave irradiation in comparison to the cases without ILs. Moreover, a convenient approach for the polymer isolation and recovery of the ILs for further polymerizations is demonstrated taking advantage of the water solubility of the investigated ILs. This synthetic approach is an alternative, efficient, and green method for the manufacture of hydrophobic polymers which may allow depletion of the emission of volatile organic compounds into the environment and for energy savings.

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