The impact of the vinyl monomers nature, concentration, and temperature on the kinetics of dispersion polymerization in the presence of polyvinylpyrrolidone was studied. The optimal technological parameters of the copolymer synthesis process are determined. It is defined that the properties of dispersion polymerization depend on the process conditions.

Study of Biodegradation, Biocompatibility and Bactericidal Activity of Film Materials with Tiamulin Fumarate Based on Polyurethaneurea

The influence of the model biological medium 199 on the structure and properties of film materials with tiamulin fumarate based on polyurethaneurea containing in its structure the hydrophilic fragments of the copolymer of N-vinylpyrrolidone with vinyl acetate and vinyl alcohol has been investigated. According to IR spectroscopy, under the influence of the biological medium 199 there are processes of biodegradation of polymer materials which are accompanied by a decrease in the intensity of the absorption band νС=О of vinylpyrrolidone ring.

Smart conductive inks

A novel conductive ink, suitable for employment in a pressure-sensitive automatic system, was prepared and characterized via scanning electron microscopy, FTIR and differential scanning calorimetry. The ink was obtained as a composite by mixing a solution of ethyl acrylate-methyl acrylate (50/50 ratio) copolymer and carbon black and graphite into a solvent standard for acrylic polymers. The ink average electrical resistance ranges from 40 ohms/cm to 150 ohms/cm.

Synthesis and Characterization of Fluorene-Imidazole Copolymers

New PAF derivatives [poly(fluorene-co-1,3-diphenylimidazolium chloride) 7 and poly(fluorene-co-1,3-diphenylimidazol-2-thione) 9] with high thermal stability were synthesized and their physical and optical properties were investigated. The obtained polymers were characterized by 1H NMR, 13C NMR, DSC, TGA, GPC, and SEM-EDX. Thermogravimetric analysis (TGA) showed excellent thermal stability of the resulting polymers. Initial weight loss (5 %) was observed around 700 K, with the main decomposition occurring around 760 K (50 %).

The Role of FeSO4 in the Obtaining of Polyvinylpirrolidone Copolymers

The proceeding of 2-hydroxyethylmethacrylate grafted polymerization on polyvinylpirrolidone has been examined in the presence of ferrum(II) sulfate. It was observed the formation of crosslinked copolymer capable to be used as a matrix for metal chemical reduction and for metal hydrogel composites obtaining. The effect of Fen+ structure and concentration on the structural parameters of the polymeric network, copolymers composition, efficiency and degree of grafting has been determined.