Polypyrrole (PPy)
films doped with molybdate and salicylate have
been successfully electropolymerized on low carbon steel in aqueous
solutions containing both molybdate and salicylate in a one-step process
that did not require any pre-treatment of the steel substrate. Salicylate-doped
PPy films were synthesized in the same way for comparison. The steel
surface was rapidly inhibited and the PPy-based films were formed
on it easily. The PPy-based films were characterized by Fourier transform
infrared, scanning electron microscopy, energy dispersive X-ray, and
thermal gravimetric analysis methods. The corrosion protection performance
of the coatings was investigated with electrochemical impedance spectroscopy,
open circuit potential (OCP), salt spray test, and Tafel polarization.
It was found that in the presence of both molybdate and salicylate
as dopants, the films on steel could present a better corrosion resistance
than PPy film doped with only salicylate. The self-healing property
of PPy-based films was observed on the OCP measurement with the fluctuation
of rest potential. The salt spray test results showed that the PPy
film doped with both salicylate and molybdate was more salt-resistant
than the PPy film doped with only salicylate. The results suggest
that the PPy coatings doped with both molybdate and salicylate are
potential for application as metallic anti-corrosion coatings.
The monomers chalcones derivatives were synthesized by the condensation reactions of the 4‐hydroxy benzaldehyde and vanillin with p‐hydroxyacetophenone. The monomers were polymerized with dibromoalkanes to give the co‐polyethers containing the photocrosslinkable α, β‐unsaturated carbonyl as photosensitizer group. The structure of polyether was characterized by 1H NMR and 13C NMR spectra. The thermal stability of the polymer was measured by thermogravimetric analysis. The solubility of the polymer in the organic solvents was also studied. The polymers have to be equipped with photosensitive functional groups applied in photopolymers technology.
Polypyrrole (PPy) was prepared on the mild steel substrate by electrochemical polymerisation in the solution containing pyrrole monomer and succinic acid. The mild steel surface could be passivated before and during electropolymerisation by molybdate. The morphology and structure of the PPy film were studied with SEM. The typical cauliflower structure of PPy was observed. Raman and IR spectroscopy showed that the obtained PPy was in an oxidised state. The thermal stability of PPy was investigated by the thermal gravimetric analysis, showing that PPy was stable at higher than 480°C. The electrochemical property of the PPy film was performed by open circuit potential, polarisation curves (I/E), and electrochemical impedance spectroscopy. The corrosion behaviour of mild steel (CT3) with PPy film in solution NaCl 3% was studied.
By the oxidative coupling polymerization, a new polythiophene containing 1,2,4‐triazole heterocyclic group was synthesized in chloroform solvent using iron(III) chloride as an oxidant catalyst. Analyses of infrared (IR) and ultraviolet–visible (UV‐Vis) spectra confirmed that the polymerization reaction took place and the absorption band at 469 nm characterized for π–π* transition in the conjugated polymer. Morphology and surface properties of the polymer were studied by field emission scanning electron microscopy (FESEM). Polymer had relatively uniform size distribution. Based on thermal gravimetry analysis (TGA), polymer is without impurities and has an adequate thermal stability in air atmosphere when completely decomposed at 500 oC. The polymer exhibited fluorescence emissions at 596 nm corresponding to the conjugated chain in polymer. Polymer exhibited a good electrical conductivity in the undoped state (around 1.37E–7 S.cm‐1 at 1 MHz).
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