Abstract
Ionic liquid (IL) mixtures are gaining popularity as a means to access the attractive properties of individual ILs while minimizing less desirable characteristics that impede their large scale adoption. We report here on the transport properties of ionic liquid mixtures that incorporate a series of asymmetrical dications including heterodications. The dicationic ILs were designed to bear triphenyl phosphonium and trimethyl ammonium cationic sites bridged to methylimidazolium, and methylpyrrolidinium cationic sites by a carbon chain, with the Bis(trifluoromethylsulfonyl)imide (NTf2) anion. IL mixtures containing 10%, 25% and 50% dicationic NTf2 by weight with alkoxyalkyl- methylimidazolium and methylpyrrolidinium NTf2 ILs were prepared. The IL mixtures were characterized for their transport properties (temperature dependent conductivity and viscosity) and thermal properties including melting point, glass transition point, and thermal degradation point. The work at BNL was supported by the BNL Office of Educational Programs and the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences under contract DE- SC0012704.
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