Electrochemical properties of polyethylene membrane modified with sulfonicand phosphonic acid groups

Ion-exchange membranes modified with sulfonic (-SO3H) and phosphonic acid ( -PO3H) groups were prepared by radiation-induced grafting of glycidyl metha crylate (GMA) onto polyethylene (PE) films and sub-sequent sulfonation and phosphonation of poly(GMA) graft chains. The surface area, thickness and vo lume of grafted PE film increased with increasing grafting yield. The speci fic electrical resistance of PE membrane modified with the -PO3H and -SO3H groups decreased with increasing the ion-exchange capacity. The PE membrane modified with -PO3H group had a lower specific electrical resistance than that of PE membrane modified with -SO3H group.