Surface morphology and some physical properties of comercial vascular grafts were analysed and correlated with the electrokinetic properties of different grafts, and studied regarding their adsorption characteristics. The SEM images of graft surfaces show that woven PET has more densely packed and more-ordered structure than knitted PET. The strong dependence of zeta potential can be observed from the exposure time to the electrolyte solution. The ZP-pH functions (pH of electrolyte solution) show significant differences between different grafts.
The adsorption behavior of chitosan on PET model film surface was studied using the quartz crystal microbalance (QCM) technique. PET foils were activated by alkaline hydrolysis in order to increase their hydrophilicity. Model thin films were prepared from PET foils by the spin coating technique. The chemical composition of the obtained model PET films was analyzed using XPS and their morphology was characterized by AFM. The adsorption behavior of chitosan and the influence of adsorption parameters (pH, ionic strength and chitosan solution concentration) were investigated in detail.