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UV-VIS STUDY ON POLYANILINE DEGRADATION AT DIFFERENT pHs AND THE POTENTIAL APPLICATION FOR ACID-BASE INDICATOR

This study elaborates the effect of pH on color changes of polyaniline (PAni) that might have application as acidbase indicators. PAni was synthesized by rapidly mixing aniline with ammonium persulfate in deionized water media. The green precipitatewas washed by using HCl 1 and acetone, then the color changed to Emeraldine Base (EB) after the predicate was dissolved in DMSO. The solution was adjusted in various pH that was pH 1-12 and the color change wasmonitored by UV-vis spectrophotometer. The absorbance of UV-Vis spectra showed dramatically increasing at 650 nm along with pH increment that waspH 3-12 (quinoid peak).The solution on the lower pH shown the higher absorbance at 430 nm due toconfigure the polaron on the polymer. The EB solution shows the green color at pH 1-3, blue color at pH 4-11, and violet color at pH 12. Therefore, PAni was potentially used as an acid-base indicator.