The Fourier transform infrared (FTIR) spectrum of each 2-hydroxyethyl cellulose (2HEC) doped with glycolic acid (GA) solid biopolymer electrolytes (SBE) sample has been deconvoluted in the wavenumber region between 1390 and 1490 cm-1 in order to predict the percentage of free and contact ions in the samples. Through solution casting method, 2HEC was complexed with different composition of GA and sample with 40 wt. % GA achieved the highest ionic conductivity at room temperature of 4.01x10-4 S cm-1, two magnitude orders higher relative to the parent host polymer. The FTIR of carboxyl stretching mode is deconvoluted, representing bands of free ions, contact ion pairs and ion aggregates to obtain an insight on ion associations. The results show that the number of free ions increases and attain maximum at 40 wt. % GA. The correspondence between free ions, contact ion pair, ion aggregates and conductivity is obvious. The increase in ion dissociation improves conductivity, while the formation of contact ion pair and ion aggregates reduces conductivity. From Transference Number Measurement (TNM), the calculated ionic species of the 2HEC-GA complexed system is confirmed predominant cationic.

In this study, a polymer-blend system consist of Carboxy Methylcellulose (CMC)-Chitosan (CS) as blend biopolymer host and doped with various composition of Dodecyltrimethyl Ammonium Bromide (DTAB) were successfully prepared via solution casting techniques. The new system has been analyzed through Electrical Impedance Spectroscopy (EIS) from temperature 303 K until 393 K to determine the conductivity of biopolymer electrolytes in the frequency range of 50 Hz to 1 MHz and the voltage between 5 to 50 mV. The optimum conductivity (1.86×10?6 S.cm?1) at ambient temperature obtained for composition of 5 wt.% DTAB. The temperature dependence of ionic conductivity was found to obeys the Arrhenius rule where R2?1 and thermally activated. The dielectric studies show a non-Debye behavior of SBEs based on the analyzed data using complex permittivity, e* and complex electrical modulus, M* of the sample at selected temperature.