A modification of the surface of the thin membranes of EVAL (ethylene vinylalcohol copolymer) by Langmuir-Blodgett films

The surface modification of the membrane as an artificial kidney made of two kinds of ethylene-vinylalcohol copolymers with 32 and 44 mol % contents of ethylene group (EVAL) have been studied by depositing the polymer monolayer on the membrane surface using the Langmuir-Blodgett technique.The permeability to PSS (physiological salt solution) and albumin rejection of the membranes were measured against the number of multilayers. The UFR (ultrafiltration rate) of PSS containing albumin decreased with the increase of the built up layers up to 2 layers and showed constant values from 3 to 10 layers of LB films.On the other hand, albumin rejection increased with the increase of built up layers. Albumin rejection for these deposited membranes of multilayer of EVAL-32 showed 21 times effectiveness more than that of ordinary membrane and 16 times for EVAL-44.Modification of the membrane has been performed by such a network structure formed by the built-up films.