Аңдатпа
Poly(ethylene terephthalate) track-etched membranes (PET TeMs) surfaces were modified with monolayer films of Nafion by spin-coating method and multilayers films of Chitozan/Sodium salt dextran sulfate (Chit/Dex) by Layer-by-Layer method.Structure, roughness of modified membrane surfaces were researched by IR-spectroscopy, atomic force and scanning electron microscopy.The values of centerline average roughness (c.l.a.) and root-mean-square (r.m.s.) roughness are increased from 7.5 and 14.2 nm to 11.0 and 19.1 nm respectively as result of TeMs modification with (Chit/Dex)4 multilayers.So IT is shown that surface's heterogeneity of modified PET TeMs are increased.Modified membranes pores are uncovered.Gas-permeability test pore diameters of modified PET TeMs are decreased by 50 nm, and diameter of greatest pore is unchanged.It was shown with static force spectroscopy, that local elasticity modulus of modified PET TeMs surface are increased from 235.5 MPa (of initial TeMs) to 590.3 and 367.5 MPa for PET TeMs/Nafion and PET TeMs/(Chit/Dex)4 respectively.Hydrophilic property of modified TeMs increased.Value of contact angle decreased from 51º to 43.8º и 36.8º for Nafion and (Chit/Dex)4 respectively.Polar component of specific surface energy increased because of presence of hydrophilic groups on modified TeMs surface.The values of water, o-xylene, and chloroform flux of PET-350 increased that connected with change of surface properties complex as a result of modification.The greatest changes in productivity from 540 l/(m 2 •h) to 831.6 l/(m 2 •h) are shown for PET-350/nafion membranes during chloroform filtration.Modified membranes allow effective ultrafiltration separation watercutting fluids emulsion.The retention coefficient of cutting fluids is of 97-98%.Hydrophilic membranes can be used for effective water purification from emulsified oil products.