In-situ polymerized polyaniline films 3. Film formation

Polyaniline films were produced on glass surface immersed in the reaction m ixture during the oxidative polymerization of aniline. Glass supports place d in the reaction mixture at the start of the oxidation were gradually remo ved during the reaction. The thickness of polyaniline films produced on gla ss, assessed by optical absorption, was followed as a function of reaction time. The progress of polymerization was monitored by temperature changes. In another experiment, glass supports were successively inserted into the p olymerization mixture. The formation of polyaniline films on glass, which h ad been already pre-coated with polyaniline, was also investigated. The pro posed model of film formation is based on the concept of the primary and se condary nucleation. Oligoaniline cation radicals adsorbed on the glass surf ace nucleate the primary growth of polyaniline film, the secondary nucleati on occurs on the produced polyaniline layer. (C) 2001 Elsevier Science B.V. All rights reserved.