Intensification phenomenon of weak ionic interactions of 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid macro-dispersed in poly(methyl methacrylate): FTIR spectroscopic evidence

摘要

Phase separated heterogeneous conducting films of poly(methyl methacrylate) PMMA/1-butyl-3-methylimidazolium hexafluorophosphate BMIPF6 have been prepared using solution cast technique and investigated by means of FT-IR spectroscopy. Based on the shifts of specific frequencies the intra- and inter molecular interactions have been estimated. To accurate determine of shifts value the Gaussian fitting of ring C-H and F-P stretching vibration modes of BMIPF6 has been applied. It was found that BMIPF6 interacts with PMMA mainly via the hydrogen atom on the second carbon of imidazolium cation and carboxylic oxygen of polymer. In addition, in BMIPF6 captured by PMMA as a liquid macro-dispersed phase the interaction between BMI+ cation and PF6- anion was found to be more intensive than a weak one in a bulk pure ionic liquid. (c) 2016 Elsevier B.V. All rights reserved.