Ionic Liquids and Oligomers Characterization

The compounds used the include ionic liquids (ILs, Merck KGaA, Darmstadt, Germany) trihexyl(tetradecyl)phosphonium tris(pentafluoroethyl)trifluorophosphate) and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, the highly polar and acidic compounds polyethylene glycol diacid (average molecular weight 600 u, PEGDA-600) and perfluorononanoic acid (PFNA), both Sigma-Aldrich, (Steinheim, Germany), and two basic oligomers (both Huntsman (Germany) GmbH), commercially available under the trade name Jeffamine D-400 (doubly amine terminated PPG with average molecular weight of about 430 u) and Jeffamine M-2005 (singly amine terminated PPG with average molecular weight of about 2000 u). The analytes are compiled in Table 1.