聚邻甲苯胺的合成及物理化学性质

聚苯胺的导电性和电化学特性已被广泛地研究。最近,对苯胺衍生物的聚合物也开始了研究,如聚邻甲氧基苯胺、聚邻苯二胺和聚邻氨基酚,其中聚邻甲氧基苯胺是一种可溶性的导电高分子材料。为了探讨苯胺聚合的机理和苯胺上不同基团对聚苯胺性质的影响,我们使用了十六种苯

SYNTHESIS OF POLY-o-METHYLANILINE AND ITS PHYSICOCHEMICAL CHARACTERISTICS

The electrolyte solution consisted of 1.5 mol.L~(-1) HCl and 0.2 mol.L~(-1) o-methylaniline was electrolysed at a constant potential by using two pieces of platinum as electrodes, the anodic potential was controlled at 0.4V(vs. SCE). A blue and cohesive film was formed at the anodic electrode, it was poly-o-methylaniline(poly-o-toluidine). Its ESR spectrum was characterized as a single narrowline. When a fresh synthesized poly-o-methylaniline(0.35V) was reduced to -0.22 V(vs.SCE), its conductivity decreased from 5.8×10~(-3) to 3.5×10~(-5) S.cm~(-1), and its peak-to-peak linewidth ΔH_(p-p) increased from 1.94 G to 3.10 G. The film colour changed with the pH values of the solution and its electrode potentials. There are two anodic and two cathodic peaks on the cyclic voltammograms of poly-o-methyl-aniline in the 1.5 mol.L~(-1) ZnCl_2 of pH 1.69, the anodic and cathodic peaks at more positive potentials shift toward the negative potentials with increasing pH values. At pH 3.89, only one anodic peak and one cathodic peak on cyclic voltammograms are remained. The peak potentials and peak currents of poly-o-methylaniline in the different pH values are independent of cycles.