聚N-甲基苯胺的质子酸掺杂

聚N-甲基苯胺(PMAn)可用酸碱进行可逆的掺杂及反掺杂。掺杂使电导增大。掺杂过程在本质上是链的质子化过程,与阴离子无关。用FTIR、UV-VIS、ESR表征了掺杂前后结构的变化。结果表明,掺杂后链上来偶电子增加,电子及电荷更加离域化,并与电导率增大相吻合。PMAn的导电载流子可能是离域化的阳离子自由基。

PROTONIC ACID DOPING OF POLY (N-METHYL ANILINE)

Poly(N-methyl aniline) (PMAn) can be doped and dedoped reversiblly by the treatment of protonic acid and base. The conductivity, which depends on the doping level, increases seven orders of magnitude after doping, but can not reach as high as that of the as-made doped PMAn. The doping process, in nature, is only the protonation of the polymer chain and independent of the counter ions. The doping levels are related to the equilibrium pH values. FTIR, UV-Visible and ESR spectra were employed to study the doping process and the structure of doped PMAn The results reveal that the chain structure changes with doping, and a lot of delocalized unpaired electrons exist in the doped PMAn, which favour the conductivity It seems that the free carrier of the electric conduction of PMAn is the delocalized cationic free radicals.