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Comparison between the Pebax®1657 and the composite ionic liquid and polymer membranes (CILPMs) (Pebax/20IL, Pebax/40IL; Pebax/60IL—full names in Table 1) studied in this work in the range of: (a) 2500–4000 cm−1; (b) 1800–400 cm−1. [C2C1py] [C4F9SO3] characteristic peaks are identified.
