Ionomeric membranes comprising (per)fluorinated, semicrystalline or amorphous, ionomeric polymers, having equivalent weight (EW) from 380 g/eq to 1,800 g/eq, which used in fuel cells, under the following conditions: membrane thickness 50 µm assembled betw...

Amorphous perfluorinated homopolymers and copolymers of perfluorodioxoles of formula (IA): wherein R'F is equal to RF or ORF wherein RF is a linear or branched perfluoroalkyl radical having 1-5 carbon atoms; X1 and X2, equal to or different from each other...

A process for preparing membranes formed by (per)fluorinated ionomeric electrolytes salified with the lithium ion, comprising the following steps: a) obtaining of (per)fluorinated polymer membranes, containing -SO F groups; b) partial or complete salificat...