полівінілпіролідон

The effect of a constant magnetic field on the polymerization of 2-hydroxyethyl methacrylate in the presence of a polyvinylpyrrolidone has been studied. The regularities of copolymer formation under different synthesis conditions, particularly depending on the magnetic field intensity, were identified. It has been shown that the magnetic field activates the complexation between the monomer and the polymer matrix, increasing the polymerization rate and the degree of structural order in the copolymers.

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 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.

The initiating ability of finely dispersed bimetallic particles in the polymerization reaction of 2-hydroxyethyl methacrylate in polyvinylpyrrolidone presence is proven. The bimetal formation on the surface of ferrum particles was confirmed by the X-ray spectroscopic microanalysis results. The regularities of block polymerization of such compositions have been studied. The effect of metals nature, monomer and polyvinylpyrrolidone ratio, as well as the temperature on polymerization kinetics and "limit" monomer conversion was determined.

The influence of the nature of modified fillers (Ni- and Cu- containing polymer-silicate materials) on the kinetics of emulsion polymerization of methyl methacrylate in the presence of polyvinylpyrrolidone graft copolymers was investigated. The effect of modified metal-containing silicate fillers on the technological properties of the developed materials was determined. In particular, the introduction of fillers contributes to a significant reduction of technological shrinkage and moisture absorption of polymethyl methacrylate materials.

Processing of polymers and composites based on them by centrifugal molding is important for production the bodies of revolution, which are used in various industries. This article analyzes the centrifugal molding and presents the results of research about new areas of such materials applications. For instance as method for the hydrogel films production of materials based on copolymers of 2-hydroxyethyl methacrylate (HEMA) with polyvinylpyrrolidone (PVP), including filled hydrogels, which can be applicable in medicine, electrical and tool engineering.

Досліджено вплив присутності дрібнодисперсних металевих наповнювачів різної природи (Zn, Co, Ni) на теплофізичні характеристики (теплостійкість за Віка, температура склування) блочних кополімерів полівінілпіролідону з 2-гідроксіетилметакрилатом. Встановлено, що теплостійкість одержаних композитів є значно вищою за теплостійкість ненаповнених кополімерів і лежить у межах 360-395К залежно від природи та вмісту металевого наповнювача.

Hydrogel membranes based on copolymers of 2-hydroxyethyl methacrylate with polyvinylpyrrolidone, modified with inorganic additives were synthesized. The influence of montmorillonite and silver on the properties of synthesized composite hydrogel membranes was studied. It was established that montmorillonite improves the mechanical properties of membranes, but slightly reduces their permeability. The chemistry of the recovery reaction of silver from its salts using polyvinylpyrrolidone as a reducing agent and stabilizer is proposed.

The article presents the results of a study of the influence of the molecular weight of polyvinylpyrrolidone on the properties of two-layer hydrogel/polycaproamide membranes. Composite membranes are obtained by the developed method, which consists in the formation of hydrogel membranes with subsequent deposition from a solution into their outer surface of a reinforcing layer based on polyamide modified with polyvinylpyrrolidone.

Досліджено особливості модифікування термопластів поліаміду 66/6 і полістирену полівінілпіролідоном у в’язкотекучому стані. За допомогою інструментальних методів виявлено зміни морфології та фазових переходів модифікованих матеріалів. Визначено вплив модифікатора на міцність і теплофізичні властивості досліджуваних термопластів.