| abstract |
An ion-exchange membrane of a sheet of an organic polymer comprising a plurality of fixed anonic groups associated with cations which comprise an organic group, e.g. quaternary ammonium cations, a process in which the membrane sheet is expanded by dry stretching to increase the surface area per unit weight of the membrane, a process for its preparation, a process for converting the stretched membrane to one suitable for use in an electrolytic cell, and that use. |