Receiving of polyaniline for water-based anticorrosion compositions

Issue 24(1) 2019
Pages 15-28

T.R. Vakhitov, S.R. Salikhova, S.N. Stepin


Kazan National Research Technological University

 


Keywords: conducting polymers, polyaniline, coating materials, anticorrosion protection

Polyaniline (PANI) is the organic polymeric semiconductor with rather high level of electronic conductivity that combines such positive features as low monomer price, excellent resistance to environmental influences, low density and reversible electric properties. PANI can be synthesized in the form of spherical particles, tubes, fibers and more complex configurations, including hollow configurations, depending on conditions of the synthesis and the choice of initial reactants. One of the applications of PANI is its use as a part of anticorrosive coating materials. In order to describe the anticorrosion action of PANI, anode and barrier protection mechanisms as well as mechanism of inhibition by dopant anions are suggested in the literature. However, insolubility of
PANI, caused by the stiffness of the macromolecule backbone, in the solvents widely used in the production of coating materials hinders its incorporation into coating compositions. Synthesis of PANI capable of processing in the water environment as mostly eco-friendly and convenient in use while maintaining its conducting properties is a current issue which is under investigation by
many scientific groups worldwide. In this review the latest research results with regard to the synthesis of PANI having improved hydrophilicity and its application as corrosion inhibitors as a part of water-borne coating materials are generalized.