Abstract
The synthesis and characterization of polymer composite membranes with hydrophilic porous substrate and hydrophobic top layer were studied. To prepare the composite membranes a polytetrafluoroethylene thin film has been applied by the technique of electron- beam sputtering deposition in vacuum on one side of a poly(ethylene terephthalate) track-etched membrane used as a porous substrate. It was found that polymer deposition on the membrane surface results in the creation of composite membranes that possess asymmetric conductivity in electrolyte solutions – a rectification effect similar to that of a p-n junction in semiconductors. This effect is caused by decreasing the pore diameter in the deposited polymer layer that results in change of the pore geometry, as well as existence in the pores of an interface between two layers with different nature.
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