The patterns of obtaining in a block of porous composites based on copolymers of 2-hydroxyethylmethacrylate with polyvinylpyrrolidone in the presence of mineral fillers - glass ceramics based on silicon oxides and aluminum were investigated. We have estimated the impact of the amount and the size of inorganic filler, temperature and initiator on the polymerization rate and «maximum» monomer conversion. The results will be used to improve the technology for producing osteoplastic porous composites.
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.
The interrelation of physico-mechanical and technological characteristics of newly created nanocomposites on the basis of polypropylene (PP)/polyamide (PA-6) mixture with PVP-modified montmorillonite has been investigated. The significant impact of modified polyamide on technological, physical and mechanical properties and heat resistance of polypropylene has been determined. It has been established that the melt flow index of the resulting composites increases by more than 2 times, compared with pure PP.
Mixtures based on polypropylene (PP) and polyamide (PA) are of great importance as structural materials, the mixing of which reduces the negative characteristics of the original polymers. Non-polar PP significantly reduces water absorption of the material during mixing with polar high hydrophilic PA. As a result, the effect of moisture on the mechanical and thermal properties of the composites decreases. On the other hand, mixing PP with PA can extend the temperature range of material exploitation at negative temperatures.
The physicochemical properties of surface of the metal-containing polymer-silicate composites, which have been obtained due to compatible precipitation of water-soluble polymers and silicates under the influence of metal chlorides, such as specific surface area, the number of active centers, moisture absorption, sorption ability were studied.
The regularities of obtaining of osteoplastic porous composites based on 2-hydroxyethyl methacrylate with polyvinylpyrrolidone copolymers in the presence of mineral fillers (hydroxyapatite, montmorillonite and wollastonite) under ultrasound are researched. The influence of ultrasound, nature and amount of inorganic filler on the polymerization rate, copolymers composition and composites porosity has been determined. It was found that homopolymerization of 2-hydroxyethyl methacrylate without filler under ultrasound action does not occur in experiment conditions.
Composite hydrogel metal-filled materials in many cases during the operation are used in the form of films, in medicine these are membrane different kind, of transdermal drugs, implants, elements of medical equipment intended for installation of a reliable contact with the human body, the instrument making-elements of different sensors (humidity, temperature, pressure, concentration of gaseous and liquid products), etc.
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.
Usually, in chemical industry the energy of ultrasound is being used to intensify technological processes. However, the complexity of the mechanism of ultrasound action makes it difficult to create a single common theory that could explain its influence on the chemical reactions. Therefore, in each particular case wide-ranging studies of the influence of ultrasound on the chemical reaction, as well as on the structure and properties of the synthesized substances and materials are required.
Розроблено методику одержання композиційних полімерних мембран модифікуванням поверхні гідрогелів тонким шаром полімеру. Підібрані склади і синтезовані ультратонкі плівкові мембрани з сумішей ПА-6/ПВП методом “сухого формування” з розчину. Одержано композиційні полімерні мембрани на основі рідкостуктурованих кополімерів ГЕМА/ПВП, які зміцнені наношаром ПА-6/ПВП і досліджені їх експлуатаційні характеристики. Встановлено, що варіювання складами гідрогелевого і модифікувального шарів і режимами формування композиційних мембран можна направлено регулювати їхню міцність і проникність.