METHOD OF OBTAINING PERFLUOROSULPHONATE POLYMERS CONTAINING SULPHONYL FUNCTIONAL GROUPS

The present invention refers to a method of obtaining perfluorocarbonate polymers containing functional fluorosulphonyl groups and that have structural formula (I) that consists in carrying out copolymerization between tetrafluoroethylene and a perfluorovinylic ether in a fluorated organic solvent medium, in the presence of a radical type starter with additional input of tetrafluoroethylene during the copolymerization process, characterized because before starting the copolymerization reaction a, previously synthesized, dispersion is introduced of a copolymer of tetrafluoroethylene and perfluorovinylic ether, in an organic solvent. The present invention also refers to the perfluorocarbonate polymer obtainable by the method of the invention and the use of this polymer to prepare ion-exchange membranes.