The structure and biomedical behavior of ion bombarded and plasma polymerized segmented polyurethane

Abstract

The biomedical behaviors of silicon ion implanted and hexamethylated disiloxane (MI) plasma polymerized medical segmented polyurethane were studied. Si ion implantation was performed at an energy of 80 keV with the doses ranging from 2 × 10 13 to 2 × 10 16 cm -2 at room temperature. MI plasma polymerization was carried out at a power of 100 W with the polymerization time ranging from 1 to 15 min. The results showed that the wettability, anticoagulability and anticalcific behavior of the surface were changed by Si ion bombardment and MI-plasma polymerization. Results of X-ray photoelectron spectroscopy and electron spin resonance analysis indicated that some of the original chemical bonds in the surface region were broken up and new functional groups were produced. At the same time, the number of radicals in the sample was increased evidently after implantation and polymerization, which was probably the main reason for the surface modification. In addition, the degree of roughness in the surface was increased after implantation, this also affected the surface properties.