Modification of polymer films by the nuclear track method

Some possibilities of the nuclear track method are shown: for example, the nuclear membranes with biporous structure in a monolithic polymer film. The permeability of this membranes is 2-5 times higher compared with the conventional nuclear membranes. The nuclear membranes with conical or funnel-shaped pores allow to increase the permeability of membranes (∼30-50%) for certain ratios between the pore radii on the two sides of the membrane (r1/r2=1.5-4.0). The composite nuclear membrane consisting of a thin selective layer and of a high porosity support allow one to solve the problem of increasing the permeability of the nuclear membranes. 6 refs.; 3 figs