表面活性剂对苯胺电聚合的影响

利用胶束在电极一有面的定向及增溶作用研究了表面活性剂对苯胺电聚合的影响，结果表明：在阴离子表面活性剂十二烷基硫酸钠（ＳＤＳ）胶束体系中，胶束介质能催化苯胺的电聚合反应，使其氧化电位负移，减少膜的降解，提高膜的稳定性，同时，也使得聚合速率增大，在０．１ｍｏｌ／Ｌ的ＳＤＳ的胶束溶液中，其聚合效率提高到不含ＳＤＳ的纯体系的２５倍，在含有１０＾－４ｍｏｌ／ＬＳＤＳ的硫酸溶液中，聚苯胺（ＰＡＮ）的成核生长为

Effects of Surfactant on Aniline Electropolymerization

The effects of surfactant on aniline electropolymerization have been studied by cyclic voltammetry and potentiostatic step techniques.The experimental results show that the anionic micelle,i.e,sodium dodecylsulphate(SDS),can greatly catalyze the electropolymerization reaction of aniline and reduce its oxidation limited potential to+0.6 V(vs.SCE).In the anionic micellar media,the local concentration of aniline on the surface of electrode may be increased,and the aniline cation radicals are more stabilized in the hydrophobic micro-circumstance of micelle,which is available to avoid hydrolysis degradation of polyaniline(PAN) and enhance the stability of the PAN film.The polymerized rate in the presence of 0.1 mol/L SDS increase 25 times than that of solutions without SDS. When the solutions sontaining 10-4 mol/LSDS,the PAN/SDS film growth via a two-dimensional(2-D) instantaneous nucleation under the electro transfer kinetic controlled,and the resulting film have a compact morphology.However,with the addition of cationic surfactant solution,e.g.cetyltrimethylammonium bromid(CTAB),the aniline electropolymerization is severely hindered due to the charge rejection between the aniline cation radicals and the cationic micellar.