Acta Chimica Sinica ›› 2008, Vol. 66 ›› Issue (3): 376-384. Previous Articles     Next Articles

Original Articles

在线紫外-可见光谱研究ITO导电玻璃电极上苯胺与对苯二胺的电化学共聚及其产物的表征

张贵荣,徐承天,张爱健,陈丽,陆嘉星*   

  1. (华东师范大学化学系 上海市绿色化学与化工过程绿色化重点实验室 上海 200062)
  • 收稿日期:2007-05-22 修回日期:2007-09-25 出版日期:2008-02-14 发布日期:2008-02-14
  • 通讯作者: 陆嘉星

Study on Electrchemical copolymerization of aniline with p-phenylenediamine on ITO electrode by in situ UV-vis Spectroelectrochemistry and Characterization of the copolymer

ZHANG Gui-Rong; XU Cheng-Tian; ZHANG Ai-Jian; CHEN Li; LU Jia-Xing*   

  1. 华东师范大学化学系
  • Received:2007-05-22 Revised:2007-09-25 Online:2008-02-14 Published:2008-02-14
  • Contact: LU Jia-Xing

The electropolymerrization of p-phenylenediamine,and the electrocopolymerization between aniline and p-phenylenediamine in 0.5M H2SO4 on ITO electrode was studied was studied in detail by in situ UV-vis spectrometry. It was observed by in situ UV-vis spectrometry the polymerization of p-phenylenediamine and the electrocopolymerization between aniline and p-phenylenediamine happened by cycling potential scan electrolysis. Experimental results showed that the absorbance band at 430nm in in situ UV-Vis spectrum ,the characterization of intermediate during the electropolymerization of aniline, disappeared because of the presence of p-phenylenediamine. It was a direct evidence that indicated the addition of p-phenylenediamine changed the mechanism of the electro-polymerization of aniline on ITO electrode in 0.5M sulfuric acid solution. FTIR spectra of films deposited on ITO electrode was obtained and showed that 1,2 or 1,2,3 substituted modes could exist in the copolymer films. The SEM images of the films showed the additional p-phenylenediamine could changed markedly morphology of films and promoted the growth of fabric morphology with large area. For 20mM aniline+ 2mM PPDA in 0.5M sulfuric acid, the diameter of fiber in film grown on ITO electrode might reach 50nm.The electrochromic behaviors of polymer films were studied in detail. The in situ spectrum of copolymer film deposited on ITO electrode was evidently different from that of polyaniline film on ITO electrode at potential from 0.0v to 0.6v.The electrochromic reversibility of copolymer was better than that of polyaniline. Furthermore, SEM images of polyaniline and copolymer after electrolyzing them at 0.8v for 20 minutes showed aggregation happened on polyaniline granular film and copolymer fibrous film after electrolyzing them at higher potential.

Key words: Aniline, p-phenylenediamine, electrocopolymerization UV-vis spectrometry, FTIR