Abstract
Membranes consisting of polyvinylidene fluoride at low degrees of sulphonation have been prepared in different experimental conditions. Because of the presence of ionogenic SO 3H groups, they exhibit ion exchange properties and ionic conductivity. Their electrochemical properties have been characterized by concentration potential coupled with an a.c. impedance method, in the frequency range of 5—10 7 Hz. It was found that the electrical resistance (10 2—10 6ω-cm) decreases with increasing HCl concentration, while, in some cases, the permselectivity is near to unity even at 0.1 M electrolyte concentration. These results are explained by assuming the presence of a very compact film, responsible for the high permselectivity, and of a thick porous part, having high electrical resistance where salt invasion readily occurs.
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