Synthesis and Characterization of Siloxy-Containing Imidazolium Ionic Liquids
Paul A. Wheeler, Jeffrey W. Gilman, L J. Mathias
A novel family of siloxy-containing imidazolium ionic liquids was synthesized and their thermal and decomposition properties studied. Three of the four compounds exhibited an unexpectedly low decomposition temperature of ca. 200 C that appears to be due to loss of trimethylsilyl groups via cleavage of the Si-O-Si bond. An imidazolium compound containing a trimethylsilyl end group without an Si-O-Si bond was stable up to ca. 300 C. These compounds were used as clay surfactant for polymer nanocomposite synthesis, but did not exhibit thermal stability high enough for the intended melt-blending application. These compounds may be useful as ionic liquids because of their unique hydrophilic / hydrophobic structure and the possibility of reduced viscosity as a result of the siloxy groups.