Fonctionnalisation du polychlorure de vinyle: Greffage de fonctions plastifiantes (type ester d'éthyle-hexyle)

Abstract

The grafting of plasticizing groups such as 2-ethyl-hexyl ester on PVC has been carried out either in solution or in the gel state through nucleophilic substitution of chlorine atoms, with the help of sodium salts of 2-ethyl-hexyl esters of o-mercaptobenzoic acid and thioglycollic acid. As with sodium thiophenate, the substitution of chlorine atoms is stereoselective with respect to iso and heterotactic triads. The glass transition temperature is lowered as the substitution rate increases and the plasticizing power of grafted 2-ethyl-hexyl ester groups of thioglycollic acid is greater than those introduced by o-mercaptobenzoic acid. Further the plasticizing power of 2-ethyl-hexyl ester groups is decreased when they are grafted on the polymer.