Amine-free polyoxyphenylene coatings were obtained on mild steel anodes by electropolymerizing phenol/2-allylphenol mixtures dissolved in hydroalcoholic solutions containing ammonium compounds. Ammonia allowed polymer growth up to thicknesses of ~ 15 ~m in 10 rain of constant voltage electrolysis. When (NH4)2S was selected as the ammonium compound, coatings were found to contain sulfur and to display remarkable barrier properties: negligible penetration of the electrolyte in the coating could be tested by ac impedance experiments within 1 month's exposure to 0.5M NaC1. Electropolymerization of phenols in ammonia solutions was also achieved on Zn but, since monomer oxidation was always paralleled by metal dissolution, highly porous, poorly protecting coatings were obtained.

Polyoxyphenylene coatings by anodic electropolymerization of phenols in the presence of ammonium compounds.

1990

Abstract

Amine-free polyoxyphenylene coatings were obtained on mild steel anodes by electropolymerizing phenol/2-allylphenol mixtures dissolved in hydroalcoholic solutions containing ammonium compounds. Ammonia allowed polymer growth up to thicknesses of ~ 15 ~m in 10 rain of constant voltage electrolysis. When (NH4)2S was selected as the ammonium compound, coatings were found to contain sulfur and to display remarkable barrier properties: negligible penetration of the electrolyte in the coating could be tested by ac impedance experiments within 1 month's exposure to 0.5M NaC1. Electropolymerization of phenols in ammonia solutions was also achieved on Zn but, since monomer oxidation was always paralleled by metal dissolution, highly porous, poorly protecting coatings were obtained.
1990
Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia - ICMATE
Ammonium Compounds
Phenols--Polymerization
Phenoxy Resins--Synthesis
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/235166
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