Low-pressure microwave plasma has been used to incorporate new functionalities onto the surface of cyclic olefin copolymers (COC). The main goal of the plasma treatment was to hydrophilize the COC's surface in order to enhance its adhesion to metals. The effect of two plasma parameters (treatment time and type of plasma gas) on the adhesion properties has been investigated. In order to investigate the opportunity for optimization of the adhesive strength in the COC-metal composite, an adhesion-promoting layer of acrylic acid (AA), or inorganic SiO 2 , has been deposited.
The surface of high-grade medical polyurethane was chemically modified and coated with tetraether lipid, employing cyanurchloride as coupling agent. The surfaces were initially grafted with hexamethylene diisocyanate and subsequently treated with water or hexamethylene diamine to generate free amino groups on the surface. This provides a convenient way for covalent coupling of tetraether lipids. These lipid-coated surfaces were investigated for bacterial adhesion using Pseudomonas aeruginosa. All lipid-coated surfaces significantly reduced bacterial adhesion. Surface topology and individual modification steps were controlled by contact angle measurements, attenuated total reflectance infrared spectroscopy, X-ray photoelectron spectroscopy, confocal laser scanning microscopy, and environmental scanning electron microscopy. This new surface modification approach may reduce the adhesion of bacteria on biomaterials.
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