Critical effect of pH on the formation of organic coatings on mild steel by the aqueous electropolymerization of 2-vinylpyridine
Critical effect of pH on the formation of organic coatings on mild steel by the aqueous electropolymerization of 2-vinylpyridine
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DOI：
10.1023/a:1018464810877
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发表时间：
1997-12-01
影响因子：
2.9
通讯作者：
Burns, CM
中科院分区：
文献类型：
--
作者：
Ling, X;Byerley, JJ;Burns, CM
在水介质中，通过2-乙烯基吡啶单体的电化学聚合，在低碳钢表面形成了聚2-乙烯基吡啶涂层。研究发现，溶液的pH值对这种电聚合涂覆过程至关重要。在低pH值下(低于3.5)，即使进行了有效的引发反应，也阻碍了生长过程，没有形成实质性的聚合物膜。在高pH值(>6.0)时，由于缺乏有效的引发反应，只形成了一层薄而不规则的膜。只有在溶液pH值为4~5.5的范围内，才能在低碳钢表面形成高质量的涂层。根据提出的自由基聚合机理，讨论了pH对电聚合的影响。本研究还解决了文献报道的一些不可重复性的实验结果问题，证实了通过单体电聚合在低碳钢表面形成聚(2-乙烯基吡啶)涂层的可行性。
Coatings of poly(2-vinylpyridine) have been formed on mild steel substrates in aqueous medium by electrochemical polymerization of the 2-vinylpyridine monomer. The pH of the solution has been found to be critical for this electropolymerization coating process. At low pH (below 3.5), even with an efficient initiation reaction, the propagation process was impeded and no substantial polymer film was formed. At high pH (above 6.0), only a thin and irregular film formed due to the lack of an effective initiation reaction. Only when the solution pH is in the range of 4 to 5.5 can good quality coatings be formed on mild steel substrates. The detailed effects of the pH on the electropolymerization are discussed in terms of a proposed free radical polymerization mechanism. This research has also resolved the issue of some of the non-reproducible experimental results reported in the literature and confirmed the feasibility of forming poly(2-vinylpyridine) coatings on a mild steel substrate by electropolymerization of the monomer.