Determination of the interaction using FTIR within the composite gel polymer electrolyte

In the previous research, the gel polymer electrolyte (GPE) which consisted of poly(methyl methacrylate) (PMMA) matrix, propylene carbonate (PC), LiClO₄ and OREC (Rectorite modified with dodecyl benzyl dimethyl ammonium chloride), achieved satisfactory properties. In the paper, the interaction between components was quantitatively determined. Characterization of interaction of CO in PC and PMMA with Li⁺ and OH group on OREC surface has been thoroughly examined using FTIR, respectively. The quantitative analysis of FTIR shows that the absorptivity coefficient a of PMMA/LiClO ₄, PC/LiClO₄, PC/OREC and PMMA/OREC is 0.902, 0.113, 0.430 and 0.753, respectively, which means that the Li⁺ or OH bonded CO is more sensitive than the free CO in FTIR spectra. The limit value of bonded CO equivalent fraction of PMMA/LiClO₄, PC/LiClO₄, PC/OREC and PMMA/OREC is 17%, 94%, 57% and 20%, respectively, which implies that all the interaction within the components is reversible and the intensity of interaction is ordered as PC/LiClO₄, PC/OREC, PMMA/OREC and PMMA/LiClO ₄.