摘要
本文根据ESR及宽线~1H-NMR的实验结果,对聚苯胺(PAn)导电机理作了初步探讨。结果表明,醌二亚胺与苯二胺双自由基间存在着共振关系,二者总是以一定的比例共存:掺杂时,共振平衡向苯二胺双自由基方向偏移;在频率高于50MHz时,一维的电子运动为占优势的传递方式,这种电子的传递通过Heisenberg交换来实现;当频率低于50MHz时,三维的电子扩散在导电机制中起了重要作用。
The conducting mechanism of polyaniline was investigated by ESR and Varying-Frequen- cy 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 elec- tron spin concentration. Heisenberg exchange rule was obeyed in its electron motion in the mo- lecular 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.
基金
国家自然科学基金
