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Polymeric hydrogels are three-dimensional high-molecular networks containing physically or chemically cross-linked (co)polymeric chains. There is a special interest of polymeric composites based on interpenetrating polymeric networks as carriers of nanoparticles of different nature. The combination of polymeric materials of different nature allows to create materials with a wide range of properties: high strength due to the incorporation of reinforcing nets, higher absorption speed and absorptive capacity towards the solvents of different nature due to the branched system of open pores size of which can be controlled during the synthesis, the ability to hold or release a variety of fillers depending on the assigned task, different degrees of biodegradation and other. This opens up the opportunities to create a variety of materials that are important in terms of environmental and health safety, for example, filled filter membranes with controlled properties. Recently silver is one of the most widespread fillers. Silver is relatively non-toxic for human cells, but possesses antimicrobial properties against a wide range of bacterial strains. Owing to this fact, silver in various forms such as elementary silver, silver ions, and silver nanoparticles are widely used in the manufacturing of domestic, industrial and medical products. Thus, the creation of hydrogel materials that act as filters with additional features such as bactericidal activity to the filtrate has a scientific value. The aim of this paper is to investigate chemo-physical and bactericidal properties of hydrogel nanocomposite interpenetrating (co)polymer networks with incorporated silver nanoparticles based on acetal of polyvinyl alcohol (PVA) and acrylic monomers: acrylic acid or acrylamide. PVA acetale nets were obtained by means of cross-linking of PVA using formaldehyde. Interpenetrating nets were obtained by swelling of PVA nets in the acrylic compositions, and the acrylic network was immobilized in PVA net by radical polymerization of acrylic monomers using cross-linking agent N,Nā€™-methylene-bis-acrylamide and red-ox system based on potassium persulphate and sodium metabisulphite. Nanocomposites with incorporated silver were obtained by introduction of aqueous silver nanodispersions during the synthesis of hydrogel or by the way of formation of silver nanoparticles in the pore space of hydrogel matrix nanoreactors. Aqueous silver nano-dispersions were characterized by dynamic light scattering (Malvern Zetasizer), showed that the average diameter of nanoparticles was about 20 nm and Z-potential had a small negative charge. Antibacterial properties of nanocomposites with incorporated silver were investigated with E. Coli and S. Aureus (Fig.1). Fig 1. a ā€“ Electron micrographs (TEM) of silver nanoparticles in nanocomposites; b ā€“ Microphotography of the enforcing net based on PVA acetal; c ā€“ Test of inhibiting zones towards S. Aureus, 108 colonies of forming units.
Sergii, Kryklia ( presenting )
Ovcharenko Institute of Biocolloid Chemistry, National Academy of Sciences of Ukraine, 42 Vernadskogo Blvd., 03680, Kyiv, Ukraine
Yuriy, Samchenko
Ovcharenko Institute of Biocolloid Chemistry, National Academy of Sciences of Ukraine, 42 Vernadskogo Blvd., 03680, Kyiv, Ukraine
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