Preparation, conductivity and ftir study on methylcellulose/acid solid polymer electrolytes

Abstract

The studies of solid polymer behavior as a thin film electrolyte have been done by many researchers. Solid polymer electrolytes belonging to the salt-solvent-polymer hybrid system, the solvent is retained in the electrolytes and helps in dissociation of salt and also provides a medium for conduction. The prepared methylcellulose as the host doped with adipic acid as the salt (MCAA), and methylcellulose doped glycolic acid (MCGA) at different salt concentration was successful. The two sets of samples were prepared by solution cast technique. It is analyzed by the Fourier Transform Infrared Spectroscopy (FTIR) and Electrochemical Impedance Spectroscopy (EIS). EIS analysis show that the ionic conductivity for MCAA is is 8.14 x 10·11 Scm·1 for the sample AA8, and the highest ionic conductivity for the MCGA is 7 .16 x 10·10 Scm· 1 (GA5). Both samples were increased its conductivity when increased its acid salt concentration. In the FTIR study, MCAA and MCGA show that the peaks were increasing in intensity and shifted to the higher wavenumber. The peaks at 1741 cm·1 (C=O) in MCAA show that the increasing intensity with the increasing of acid concentration. COH bond at 1279 cm·' was released the Ir ions and form C=O bond. The peaks in the range of 1000 cm·' to 1600 cm·' in MCAA shows to have shifted peaks from the peaks that determined in pure AA spectrum. 1375 cm·' and 1458 cm·' were assigned to the CH2 wagging and CO stretching. MCGA shows the interaction between MC and GA in the wavenumber region 700 cm·' to 1500 cm·'. 951 cm·' was assigned to the CH2 rocking condition and 1431 cm·' assigned to the OH bending.