AbstractPoly(acrylonitrile–methylmethacrylate–sodium vinylsulphonate) membranes were subjected to modification with a view to improve their dialysis properties. Hydroxylamine and diethylaminoethylmethacrylate were used as modifying agents. As a result of the modification, nitrile groups depending on the modifying agent were partially converted to primary amine, oxime, and tertiary amine groups. The newly formed functional groups provide the membrane more hydrophvlic properties and the permeability of the membranes substantially increases. The appearances of the NH2and oxime groups were identified by IR spectroscopy. The primary as well as tertiary amino groups were determined quantitatively by potentiometric titration. The pore size distribution of the initial as well as modified membranes were compared. The mentioned modifying agents appeared to be very prospective to improve the dialysis characteristics of the ter‐PAN me
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