The paper presents the results of the study of copolymerization of 2-hydroxyethylmethacrylate (HEMA) with polyvinylpyrrolidone (PVP) under the action of two-component initiation systems of iron (II) sulfate/radical type initiator. The influence of the nature of the radical initiator (In) in the FeSO4/In system on the behavior of the polymerization of HEMA/PVP compositions, structural parameters of the polymer matrix network and properties of hydrogels based on pHEMA-gr-PVP copolymers were established.
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.
The research results of surface adsorption magnitude and tensile strength of combined polyamide-hydrogel membranes, depending on the content of the hydrogel lining membrane are presented in the article. It was found that the molecular weight variation of PVP, both in the structure of copolymer and in modifying blend, as well as the time of staying hydrogel film in the modifying solution allow to regulate the properties of combined membranes directly, in particular, its strength and permeability.
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 methods of obtaining structured and water-soluble nanocomposite films based on polyvinyl alcohol and intercalated montmorillonite are presented in the paper. The structure and thermophysical characteristics of the obtained films were investigated by differential scanning calorimetry. It was found that the modification of polyvinyl alcohol by intercalated montmorillonite reduces the degree of crystallinity of the obtained nanocomposites but significantly increases their heat resistance.
The influence of technological factors on the regularities of obtaining silver nanoparticles using polyvinylpyrrolidone as reducing agent has been researched and its influence in compositions content on antimicrobial properties of last ones have been defined. The impact of temperature and polyvinylpyrrolidone content as well as Ag+ concentration on the kinetics of the reduction reaction of silver ions was determined. Silver-containing composites in the form of porous blocks and films were synthesized and their bactericidal and fungicidal properties were studied.
The results of saturation with alcohol solutions of hydrogel films based on copolymers of polyvinylpyrrolidone with poly-2-hydroxyethyl methacrylate have been considered in the paper. The impact of ethanol concentration which is the most often applied for the therapeutic extracts production based on medicinal herbs has been researched. The influence of samples preparation conditions on amount of alcohol-water mixture absorption was also determined.oplastic
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 of obtaining nanocomposites based on polyamide-6 and montmorillonite intercalated by polyvinylpyrrolidone by precipitation from a solution in formic acid was developed in the work. The structure and physical interaction between the components of nanocomposites were studied by the methods of XRD, IR spectroscopic, and microscopic analyzes. The presence of polyvinylpyrrolidone in the structure of nanocomposites obtained from the solution was confirmed by IR spectroscopic analysis.
Physico-chemical properties of developed nickel-containing modified silicate materials as the nucleators for composites based on polyamide 6 are presented. As it was established, additive of the nucleator modified by polyvinylpyrrolidone promotes the increase of crystallinity degree of polyamide 6 and the decrease of crystallite size. It was found that changes in the structure of the material cause the increase of its tensile strength, surface hardness and Vicat softening point.