hydrogels

The article presents the results of a study on the electrical conductivity of aqueous solutions of water-soluble polymers, including polyvinylpyrrolidone, polyvinyl alcohol, polyethylene glycol, and polyacrylic acid, as well as their binary mixtures and polymer solutions in the presence of the monomer 2-hydroxyethyl methacrylate. The primary focus is placed on the influence of the nature and concentration of the polymers, as well as the component ratios in the solutions, on their electrical conductivity.

The kinetic characteristics of the reaction of nickel precipitation by hypophosphites in the volume of the solution were studied, depending on the pH of the medium, temperature, oxidant content, nature and concentration of the activator, and the presence of a water-soluble polymer –polyvinylpyrrolidone (PVP). It was found that the presence of PVP in the solution affects the duration of the induction period and the rate of the reduction reaction, and the nature of the effect of PVP significantly depends on the pH of the medium.

The article analyzes and summarizes the latest achievements in the field of polymer systems for controlled release devices based on hydrogel materials. Possible directions of drug delivery are presented, including the use of granular hydrogels, which work on the principle of drug sorption − release in the body.

The efficiency of using solutions based on mixtures of polyamide with polyvinylpyrrolidone (PVP) in formic acid as modifiers of highly permeable hydrogel membranes based on copolymers of PVP with 2-hydroxyethyl methacrylate was established. The modification ensures the formation of composite membranes with strengthened selectively permeable nano- and microlayers.

In this work agar- and borax-based hydrogels with and without the addition of poly(vinyl alcohol) (PVA) at different concentrations were synthesized. Hydrogels were modified by the same amount of acetylsalicylic acid (ASA) which exhibits antithrombotic properties. The effect of modification by ASA on the properties of hydrogels was analyzed.

The possibility of using hydrogels based on copolymers of polyvinylpyrrolidone with 2 hydroxyethylmethacrylate to saturate them with plant extracts was established. Hydrogel materials were obtained with extracts of Calendula officinalis and Arnica montana. The sorption capacity of the hydrogels regarding the extract data was determined.

The method for obtaining composite hydrogel tubular products with the increased strength on the basis of copolymers of 2-hydroxyethylmethacrylate with polyvinylpyrrolidone has been developed. The method consists in the formation of hydrogel tubes with a subsequent precipitation from the solution into their outer surface of the reinforced layer based on polyamide, modified with polyvinylpyrrolidone.

The properties of nickel-filled copolymers of polyvinylpyrrolidone with 2-hydroxyethylmethacrylate and hydrogel materials based on them, obtained by the method of polymerization with simultaneous reduction of metal ions have been investigated. The influence of polymer-monomer composition formulation, content of metal-filler and conditions of Ni2+ reduction reaction on physico-mechanical, sorption, electrical and magnetic characteristics of obtained materials has been established.

The method for obtaining composite hydrogel tubular products with the increased strength on the basis of copolymers of 2-hydroxyethylmethacrylate with polyvinylpyrrolidone has been developed. The method consists in the formation of hydrogel tubes with a subsequent precipitation from the solution into their outer surface of the reinforced layer based on polyamide, modified with polyvinylpyrrolidone.