Phosphonic acid-containing polysulfones as anticorrosive coatings
As a part of research work to elaborate polymeric materials for metal corrosion protection, French researchers have developed a new family of phosphonic acid-containing polymers.
The synthesis and the characterisation of polysulfones bearing alkyl phosphonate ester side groups are first described. These polymers are synthesised by direct polycondensation of a phosphonate ester-containing bisphenol by aromatic nucleophilic substitution. The physicochemical properties of the resulting polymers are described.
Evaluating the anticorrosive properties
Acidic hydrolysis of phosphonate esters results in the formation of phosphonic acid groups. A series of phosphonic acid-containing polysulfones is therefore obtained and characterised. A preliminary evaluation of the anticorrosive properties of these polymers is described. In 0.25M Na2SO4 solution, the corrosion rate of a polymer-coated mild steel sample is much lower than of the free metal substrate. These results suggest that phosphonic acid-containing polysulfones might be interesting as anticorrosive coatings.
The study is published in: Journal of Applied Polymer Science, Volume 132, Issue 17, May 5, 2015
