The Effect of HCl on the Polymerization of Aniline
with Ferric Chloride¹

M. M. Ayad and M. Whdan

Department of Chemistry, Faculty of Science, University of Tanta,

Tanta 31527, Egypt

Received October 17, 2007

Abstract—The chemical oxidation of aniline with ferric chloride, FeCl₃ · 6H₂O in the HCl aqueous solutions
to form polyaniline (PANI) powder and films has been investigated. The effect of acid concentration on the dep-
osition of PANI film in situ was studied. The presence of an acid affects both the yield of the polymer and the
growth rate of the film. This effect was corroborated by the UV-visible absorption studies of the films deposited
on glass supports during the polymerization. The influence of the acid on the yield of the PANI powder formed
in the bulk solution was also examined. We have found that the yield of the polymer formed either on the surface
or in the bulk solution decreased with the increasing concentration of HCl. The effect of HCl concentration on
the in situ UV-visible absorption at the early stages of aniline polymerization is also discussed.

DOI: 10.1134/S1061933X08050037

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