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 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 grafted copolymerization of 2-hydroxyethyl methacrylate to polyvinylpyrrolidone in the presence of mineral fillers (hydroxyapatite, montmorillonite and wollastonite) under ultrasound has been investigated. The effect of ultrasound, nature and amount of mineral filler on the polymerization rate and composition of copolymers has been determined. Ultrasound substantially intensifies the polymerization process and actively affects the formation of the copolymer composition. Under its action, a porous structure of composites is formed, even without adding special foaming agents.
The influence of the solubility parameter on the regularities of obtaining polymer dispersions based on copolymers of 2-hydroxyethyl methacrylate and glycidyl methacrylate are investigated. A method of nucleating polymerization for obtaining micron-sized monodispersed spherical materials is proposed. The influence of the nature and amount of solvent on the dispersion characteristics of the polymer particles has been established.
The kinetics of polymerization of 2-hydroxyethyl methacrylate with polyvinylpyrrolidone in a thin layer were studied. The dependences of the conversion for polymerization HEMA with PVP in mass and in solvent were determined. (Co)polymerization exotherms for the reaction in mass were calculated. The reaction order by initiator, monomer and polymer was determined and the mathematical dependence of the total rate of grafted copolymerization of HEMA to PVP was calculated.
Polymer hydrogels, which are close to biological cells in their physical state, have proven to be effective in medicine and pharmacy. However, in practice the wide usage of hydrogel products is limited by their low mechanical strength, even though generally the application of hydrogels has a great potential . Recently, the interest to the polymer hydrogel materials, that have high mechanical strength in a hydrated state along with the hydrophilic and diffusion-transport properties, has increased.
The effect of the solubility parameter on the regularities of the hydrogel suspension obtaining based on the copolymers of 2-hydroxyethyl methacrylate and glіcidil metakrilat with polyvinylpirrolydone is investigated. The influence of the solvent nature on the diffusion processes in the suspension polymerization, the dispersion characteristics of hydrogel particles and kinetics of polymerization is determined.
The principal opportunity of uptaking weakly crosslinked hydrogel emboli is shown by Doxorubicin at different temperatures. The optimal process time is 1.5–2.5 h. It is revealed that Doxorubicin is capable to diffuse from a polymeric matrix, having targeted medical effect on surrounding tissue and reducing side impacts on other organs.