Abstract
The effects of aging temperature on the doping reaction of thermally aged polyaniline have been studied. The behavior of the reaction was analyzed with respect to the concentration of sulfuric acid solution, the temperature of the solution and the dipping time. Samples prepared by casting were heated at 90-170°C and then dipped into aqueous solutions of H2SO4. The degree of protonation was characterized by the peak height of 1150 cm-1 absorption band formed in doping reactions. The results obtained indicate that the protonation has two steps. At first, some kinds of hindrances protecting imines should be removed at a certain proton concentration and/or dipping times. In the second step, protonated imines are formed in a thermally activated reaction.
