Influence of Plasma Treatments on the Hemocompatibility of PET and PET + TiO2 Films
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A dielectric barrier discharge (DBD) in helium was used to ameliorate the interface between the blood and the surface of polymeric implants: polyethylene terephthalate (PET) and PET with titanium oxide (PET + TiO2).
A higher crystallinity degree was found for the DBD treated samples. The wettability of polymers was improved after the treatment. The chemical composition, analyzed by infrared spectroscopy was preserved during the DBD treatment. The surface modifications have been correlated with polymers hemocompatibility. Concerning the polymer surface–blood interaction, the treatment induced a decrease of the interfacial tension between the blood components and the treated surfaces. The in vitro tests of hemocompatibility showed no perturbation in the blood composition when the polymer samples are present in the blood volume. An interesting result is related to the whole blood clotting time that shows a dramatic increase on the treated surfaces. Moreover, the coagulation kinetics on the treated surfaces is modified.
KeywordsBlood-material interface Dielectric barrier discharge Hemocompatibility Polymers Surface modification
The authors thank PhD Cristina Morariu, Hematology Laboratory, Military Hospital, Iasi, Romania, for its help with the hemocompatibility tests. This work was supported by the Romanian National University Research Council (CNCSIS) under Grant 1461/2005–2006.
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