This paper reports a research methodology for characterizing wound dressings in order to assess the application properties of medical devices as a whole. Wound dressing was based on grafting polymerization of N-vinyl caprolactam and 2-hydoxyethyl acrylate on polyvinyl alcohol. The obtained copolymer was characterized by FTIR. Cross-linked films of wound dressings were obtained by radiation treatment of the copolymers. The physico-mechemical properties of wound dressings were investigated. Testing included degree of swelling, elastic modulus, tensile strength and elongation at break. The radiation doses of the reaction affected physico-mechanical properties of wound dressings. As the dose of radiation increased, the yield of gel increased, degree of swilling and tensile strength decreased. Also, the results indicated that yield of the crosslinked fraction increases, and the swelling capacity of polymer mesh decreases with increasing 2-hydroxyethyl acrylate content in the graft copolymer

Application of composite materials based on polyvinyl alcohol in phytoremediation soilOil production, transportation, transshipment and storage lead to accidental soil pollution with oil products. To solve this problem, the researchers proposed the possibility of using polymer films for the rehabilitation of oilcontaminated soils. In the present work, in order to clean the soil from oil products, films based on polyvinyl alcohol and chitosan were obtained, their main physical and mechanical properties were investigated. The results of IR spectrometric analysis showed good compatibility of the starting components. It was found that the films obtained possess rather high indices of mechanical strength. Moreover, films containing 80 % synthetic polymer -PVA showed the highest mechanical properties. The latter is apparently associated with the formation of a network of intermolecular hydrogen bonds between chitosan and PVA, which favorably affects their operational characteristics. Pollution modeling was carried out by applying oil to the soil of the Karazhanbass field. The resulting films based on polyvinyl alcohol and chitosan were used as recultivates, which were applied in concentrations of 0.2 g/kg of soil. The effectiveness of remediation of oil-contaminated soils was evaluated by measuring the content of oil products and conducting phytotests of the studied soil samples. The results of the assessment of the degradation of oil products in the process of reclamation and the phytotesting indicators obtained in the dynamics of the experiment allow us to conclude the effectiveness and feasibility of using polymer films based on polyvinyl alcohol and chitosan to clean oil-contaminated soils.

Thermal insulating materials based on diatomite with burnable and reinforcing additives modified with synthetic and natural polymers have been developed. A mixture of polyvinyl alcohol and starch was used as modifying polymers. The parameters of linear shrinkage, density, tensile strengths in compression and bending, as well as the coefficient of thermal conductivity of the material were determined depending on the concentration and ratio of polymers. It was established that polymer additives had a positive effect on almost all specified characteristics of thermal insulating materials. For example, when adding polymers up to 1 mass.%, the linear shrinkage coefficients decrease from 14.5 to 4.5%, the ultimate compression strengths increase from 0.22 to 2.51 MPa, the ultimate bending strengths increase from 0.2 to 1.26 MPa, the coefficients of thermal conductivity decrease from 0.068 to 0.049 W/m∙K. The densities of materials are in the range of 0.592-0.491 g/cm3. The results of the work showed that the obtained heat-insulating materials can be used as plasticizers in the field of thermal energy.

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