The Study on Conducting Mechanism of Polyaniline

The conducting mechanism of polyaniline was investigated by ESR and Varying-Frequency Proton NMR. The results have shown that there is a resonance between bipolaron and two neighbor polarons. The bipolarons and polarons always co-exist in polymer chain. The proton doping was initiated on imine nitrogens to form bipolarons, and then the resonance equilibrium shifts to polarons by the effect of anion and resonance, which resulted in the increasing of electron spin concentration. Heisenberg exchange rule was obeyed in its electron motion in the molecular chain and the positive charge was delocalized in a certain conjugation region. While the one-dimension electron motion is the main contribution to conducting progress with the NMR frequency above 50 MHz, but the interchain electron exchanged will play a more important role in it with the frequency below 50 MHz.