掺杂聚乙炔的电聚合及其电化学行为

采用电脉冲技术,以硝酸结的二甲基甲酰胺溶液为电解液,在铂电极上得到质地均匀,附着良好且有相当厚度的聚乙炔(PA)膜.不发生近期有关文献所报导的生成的PA以粉末状沉淀于电解液中的现象;电极表面状态,溶液的浓度、温度,脉冲电流的波形、强度,以及溶液中通入乙炔的量对聚合过程有重大影响;红外光谱和原子吸收光谱、电导率的测量以及循环伏安(CV)曲线皆证明在铂电极上的聚合物是Co~(2+)离子掺杂的PA.本文还从聚合方法的特点提出了一个直接估算电导率的公式.按此式计算的结果与实测值相吻合.

ELECTROPOLYMERIZATION OF DOPED POLYACETYLENE AND ITS ELECTROCHEMICAL BEHAVIOR

Polyacetylene (PA) may be successfully and rapidly prepared by electrochemical pulse technique as uniform, cohesive and considerably thick film on the surface of platinum electrode in suitably concentrated dimethylformamide (DMF) solution of cobalt nitrate. This result Is different from the recent papers covering this project. It is reported in some papers that the PA film could only be formed on the platinum electrode at the beginning stage but could not thicken itself to a considerable thickness, the formed PA hereafter looks as powdery and falls down from the electrode. The surface state of the platinum electrode, the temperature and the concentration of electrolytic solution, and the quantity of acetylene passing into the electrolytic solution have great influence on the polymerization processes of polyacetylene. The influence of the wave shape and density of pulse current on the thickness of film is remarkable. The infrared spectrum, atomic absorption spectrum, conductivity measurement and the cyclic voltam-mogram of the PA film synthe sized by electrochemical pulse technique demonstrate the polymer formed on the surface of platinum electrode is Co ions doped polyacetylene. In this paper, a dire ctmethod for estimation of PA film conducting theoretically has proposed.