Polyurethane was treated by nitrogen ions with energy of 20 keV and fluence of 1014 - 1016 ions/cm2. Modified polyurethane was investigated by the IR FTIR, Raman and EPR spectroscopy, AFM microscopy. The contact angle and the surface energy of modified polyurethane are measured. Polyurethane after treatment has a carbonized layer of 70 nm thickness and partly depolymerized layer below the carbonized layer. Polyurethane after treatment have wave-like surface relief and cracks. Carbonized layer of the modified polyurethane contains highly active free radicals. It provides high hydrophilicity of modified polyurethane surface. High activity free radicals and hydrophilicity of modified polyurethane surface provides a saving of biological activity of the covalently attached proteins. As results, it provides to attachment and growing of endothelial cells on the polyurethane surface. The modified polyurethane can be applied for soft tissue medical implants.Keywords: Carbonized layer, polyurethane, plasma ion implantation, implant, biocompatibility
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