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Moscow, Russia

Stolyarov V.P.,27th Research Center | Baranov V.A.,27th Research Center | Bozhko N.N.,Moscow State University of Printing Arts | Nazarov V.G.,Moscow State University of Printing Arts
Inorganic Materials: Applied Research

A comparative study of how modification of polyethylene film surfaces performed by plasma- chemical treatment and chemical modification by sulfonation and fluorination influence the interaction with blood components is performed. In order to vary the depth and intensity of the impact on the polyethylene surface during processing, the duration of treatment is varied, while the other optimal parameters of the modification process are constant. The characteristics of the polyethylene surface, such as the wetting angle by water, surface energy, surface morphology, that change during treatment are determined. It is shown that these changes have a symbate behavior. The influence of polyethylene treatment on the hemocompatibility parameters of modified surfaces, such as the degree of hemolysis induced by contact with a foreign surface, the number of adhering platelets, and the degree of their activation, is studied. All three investigated modification methods show the possibility of significant improvement of the hemocompatibility parameters, but the most promising method is the method of surface fluorination that provides the maximum increase in the hemocompatibility properties and allows one to modify finished products of various shapes and sizes. © 2011 Pleiades Publishing, Ltd. Source

Bozhko N.N.,Moscow State University of Printing Arts | Stolyarov V.P.,27th Research Center | Baranov N.N.,27th Research Center | Bablyuk E.B.,Moscow State University of Printing Arts | Nazarov V.G.,Moscow State University of Printing Arts
Inorganic Materials: Applied Research

The process of obtaining high-molecular inclusion compounds of polyvinyl alcohol (PVA) doped with iodine upon exposing aqueous solutions of the polymer to vapors of crystalline iodine in normal condi-tions is studied. It is visually recorded that the initially colorless aqueous PVA solution turns dark blue, then black, and acquires a gel-like consistency. If potassium iodide (1-10 wt %) is present in an aqueous PVA solu-tion, the gel is transformed into a tight jelly and this transformation is accompanied by syneresis and leads to significant shrinkage (up to 40%) of the gel. It is established that the content of iodine in the jellies depends on the initial concentration of potassium iodide in a PVA solution and reaches significant values. When sub-jected to drying, the jellies form dyed-black film samples containing iodine, which does not actually subli-mate from them during a long shelf life. The iodine content in jellies and dried samples of PVA can reach 75% of the polymer's dry weight in some cases. Potential fields of applications for iodine-containing polyvinyl alcohol matrices are pharmaceuticals, medicine, and veterinary science, including their application in trans-dermal therapeutic means. © Pleiades Publishing, Ltd., 2010. Source

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