Obtention de membranes semi-perméables à propriétés remarquables par le greffage radiochimique de films de polytetrafluoroéthylène

Semipermeable membranes were prepared by grafting in the bulk Teflon films with acrylic acid, 4-vinyl pyridine, and both monomers together by a method of successive grafting. Some kinetic features of these reactions are described. The swelling of the grafted membranes was investigated. In the case of vinylpyridine grafts the swelling properties were also examined after quaternization of the pyridine groups by HCl. A wide variety of membranes can be prepared by the methods described. These membranes exhibit excellent mechanical properties, even in the swollen state, and withstand remarkably well various corrosive media.