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The effect of ionic charge carriers in 2-hydroxyethyl cellulose solid biopolymer electrolytes doped glycolic acid via FTIR-deconvolution technique
3rd International Conference and Exhibition on Biopolymers & Bioplastics
M I N Isa and A N A Bashirah
Universiti Malaysia Terengganu, Malaysia
Posters & Accepted Abstracts: J Bioremed Biodeg
Abstract
The Fourier transform infrared (FTIR) spectrum of 2-hydroxyethyl cellulose (2HEC) doped with glycolic acid (GA) solid biopolymer electrolytes (SBE) samples has been deconvoluted in the wavenumber region between 1160 and 1300 cm-1 in order to investigate 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 was deconvoluted representing the bands of free ions, contact ion pairs and ion aggregates to obtain an insight on the ion associations. The results showed 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 the conductivity, while the formation of contact ion pair and ion aggregates reduces it. The calculated ionic species of the 2HEC-GA complexed system from Transference Number Measurement (TNM) confirmed that the system is predominantly cationic.Biography
Email: ikmar_isa@umt.edu.my
