AIR PLASMA TREATMENT OF POLYACRYLONITRILE POROUS MEMBRANE

The effect of plasma treatment of porous polyacrylonitrile membranes i s discussed. It is shown that air plasma increases the surface polarit y at low-energy treatment and gradually diminishes it when the energy is increased. When the plasma is set at energies of 12, 30 or 60 W, et ching of polymers dominates. Pore diameters of the membranes increase and their distribution functions become broader. When plasma of higher energies (120 or 180 W) is used, the effect of changes of the pore di stribution disappears. Membranes modified with plasma of 60, 120 or 18 0 W do not differ in their porous structure. A simple method of an eva luation of pore diameter distribution function is presented.