Electrochemical synthesis, characterization and some properties of a polymer derived from thioflavin S

被引:5
作者
Atta, NF [1 ]
机构
[1] Cairo Univ, Coll Sci, Dept Chem, Giza 12613, Egypt
基金
美国国家科学基金会;
关键词
thioflavin S; electropolymerization; conducting polymers; corrosion inhibition; electrochemical impedance spectroscopy;
D O I
10.1016/j.eurpolymj.2005.05.032
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polymeric films derived from thioflavin S were electrosynthesized on mild steel and silver electrodes in sulfuric acid and lithium perchlorate-containing aqueous solutions. The introduction of thioflavin S in an acidic solution protected the surface of steel from corrosion. The electrochemical behavior of the steel coated with a layer of poly(thioflavin) was examined by electrochemical impedance spectroscopy. The films exhibited a capacitive behavior and were semi-conductive in nature. Infra red reflectance measurements of the polymer films at the steel surface showed that the polymer structure retained the aromatic structure of the benzene and thiazole rings with the distinction of a nitrogen quinone vibrational band. Surface morphology of the polymer film was examined with scanning electron microscopy. The films are yellow, compact and dense when electrochemically formed onto steel surfaces when compared to a blue rather porous when formed onto silver electrode. The mechanism of electropolymerization of thioflavin is given and found similar to that of aniline with the possibility of metal chelation with the sulfur and/or nitrogen in the thiazole ring. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3018 / 3025
页数:8
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