ATR-FTIR studies on ion interaction of lithium perchlorate in polyacrylate/poly(ethylene oxide) blends

The interaction behaviours between components of polyacrylate (PAc)/poly(ethylene oxide) (PEO) and lithium perchlorate (LiClO4) were investigated in detail by Attenuated Total Reflectance (ATR)-Fourier Transformed Infrared (FTIR) spectroscopy. Solution cast films of the PAc/PEO and PAc/PEO/LiClO4 were examined. No obvious shifting of the characteristic ether and ester group stretching modes of PEO and PAc was observed, indicating incompatibility of the binary PAc/PEO blend. The spectroscopic studies on the PAc/PEO/LiClO4 blends reveal that Li+ ions coordinate individually to the polymer components at the ether oxygen of PEO and the C–O of the ester group of PAc. Frequency changes observed on the ν(C–O–C) and ω(CH2) of PEO confirm the coordination between PEO and Li+ ions resulting in crystallinity suppression of PEO. The absence of experimental evidence on the formation of PEO–Li+–PAc complexes suggests that LiClO4 does not enhance the compatibility of PAc/PEO blend.