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Effect of Protonic Acids on the Reaction Rate in Chemical Polymerization of Polyaniline  

Hong, Jang-Hoo (Department of Fine Chemistry, Seoul National University of Technology)
Jang, Beom Soon (Department of Fine Chemistry, Seoul National University of Technology)
Publication Information
Applied Chemistry for Engineering / v.16, no.5, 2005 , pp. 684-688 More about this Journal
Abstract
Aniline was polymerized in various protonic acid (HF, HC1, HBr, HI, $H_2SO_4$) aqueous solutions with different acidity. During the reaction, the dimer formation and the reaction rate were examined as functions of acidity (pH) and the size of counter ions. Open-circuit potential measurements were carried out to investigate the effect of protonic acid on the reaction rate. The results showed that polymerization rate in HF aqueous solution was very slow and polymerization did not occur in HI aqueous solution. These results were explained in terms of acidity and power of oxidation. The ratio of formation of dimers varied with the kind of protonic acid, and the results were explained with the nucleophilicity, solvation effect, and mobility of counter ions.
Keywords
Polyaniline; open-circuit potential measurement; protonic acid; reaction rate; counter ions;
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