SULFURIC ACID-DOPING ON THERMALLY AGED PO LYANILINE

The effects of aging temperature on the doping reaction of thermally a ged polyaniline have been studied. The behavior of the reaction was an alyzed with respect to the concentration of sulfuric acid solution, th e temperature of the solution and the dipping time. Samples prepared b y casting were heated at 90 similar to 170 degrees C and then dipped i nto aqueous solutions of H2SO4. The degree of protonation was characte rized by the peak height of 1150 cm(-1) absorption band formed in dopi ng reactions. The results obtained indicate that the protonation has t wo 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.