The aim of the study was to investigate the prevalence of acute viral hepatitises A, B and C in the Volgograd region; the range and identification of the most frequently prescribed pharmacological groups to be used in hospital environment; and analyzing the price dynamics of medicines. These factors will make it possible to assess the state of the medicine provision for the patients with this disease in hospital environment. Materials and methods. In the study, the following methods have been used: comparison, a method of grouping indicators and a structurallogical method. The materials were the hepatological department patients’ treatment sheets (Volgograd Regional Clinical Infectious Diseases Hospital N1).Results. Acute hepatitis A is the most common (46.9%), acute hepatitis B occupies the second position (27.4%), and acute hepatitis C – the third one (25.7%), where in 46.2%, 23.5% and 14.7%, respectively, are accounted for by icteric viral hepatitis. Hepatoprotectors, symptomatic medications and rehydration and detoxification medicinal preparations are prescribed for all forms and degrees of the disease severity.Conclusion. The study has revealed a decreased morbidity of acute viral hepatitises A, B and an increased morbidity of acute viral hepatitis C in the Volgograd region. Among all the types of hepatitises, the prevailing one is the icteric form of moderate severity. The range of medicinal preparations prescribed for the treatment of acute viral hepatitises has been studied. Most often, doctors prescribe hepatoprotectors, rehydration and detoxification medicinal preparations. The study of price dynamics, showed a predominant increase in hepatoprotectors and a decrease in medicines for rehydration and detoxification. The results obtained indicate a tendency towards the improvement of drug provision in the Volgograd Region, for the patients with acute viral hepatitises. Besides, the results of the study give an opportunity to consider the ways of its further optimization.

To expand the range of properties and the range of types of thermoplastic elastomer (TPE), materials based on ternary blends of polypropylene and polar and non-polar rubbers were produced and investigated. To obtain blended and dynamically vulcanised materials, one- and two-stage methods were tested. It was established that the best properties are possessed by composites produced using master batches (rubber mixes) based on a thermoplastic vulcanisate (TPV) rubber phase, and to improve the combination of polymers of different polarity, functionalised additives modifying the polypropylene are necessary. Optical microscopy was used to study the influence of compounding factors (the ratio of components of the polymer phase, the presence or absence of compatibilisers) and technological factors (the production method) on the structure and properties both of blended and of dynamically vulcanised TPEs. A study of the morphology of blended and vulcanised TPEs showed that, in all cases, in the polypropylene, which is the dispersion medium, there are areas rich in rubber to different degrees. Here, fragments of polar rubber are found both in the polypropylene and in zones rich in non-polar rubber, and the range of particle sizes of the disperse phase depends on the production method. The introduction of a compatibiliser leads to a considerable increase in the homogeneity of distribution of the components throughout the material, and to a reduction in the size range of the disperse phase and in the thickness of the polypropylene-rich surface layer of the extrudate (strand). In the surface layer of the strands, anisotropy of the polypropylene fibrils is observed in the direction of extrusion.

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The possibilities of increasing the interaction between the components of previously developed thermoplastic vulcanisates based on polypropylene and a combination of isoprene and nitrile butadiene rubbers were studied. The morphology of the composites was recorded by means of optical microscopy using an analytical complex based on a Leica DM-2500 optical microscope, a Leica DFC-420C digital high-resolution colour camera with a Peltier cooling system, and a specialised computer desk. The parameters of crystallisation of polypropylene were measured by differential scanning calorimetry using a DSC 204F1 Phoenix instrument (Netzsch). The physicomechanical properties of the vulcanisates were also determined. Maleinised polypropylene, a copolymer of ethylene with vinyl acetate, and their mixtures were used as compatibilising additives. Maleinised polypropylene was introduced together with polypropylene in a quantity of 1–10 parts; no changes in properties were observed with increase in the dosage above 4 parts, so this dosage was used. The copolymer of ethylene with vinyl acetate (1–10 parts) was introduced into the rubber phase at the stage of rubber mix preparation specially to improve the compatibility of polypropylene and nitrile butadiene rubber. The introduction of maleinised polypropylene leads to an increase in the workability and in the level of elastic strength properties, in particular the tensile elastic modulus and hardness. A considerable increase in the uniformity of distribution of components throughout the volume, a finer dispersion of the rubbers in the polypropylene matrix, and a reduction in the number of pores in the material were shown, and also an increase in the degree of polypropylene crystallinity measured under experimental conditions. The most positive effect is observed with the combined introduction of the copolymer of ethylene with vinyl acetate and the maleinised polypropylene: the nominal stress under elongation increases by 34%, and the elongation at break by 15%. The combined introduction of the compatibilising additives improves the compatibility of the components of the system, the phase boundaries become more diffuse, there is a reduction in the optical density of rubber-rich zones, and these zones are penetrated by polypropylene fibrils.

Viral hepatitis is an international public health threat. With the adoption of the UN Assembly Resolution in 2016, the problem of hepatitis no longer remains in the shadows. An important step towards eradicating chronic hepatitis C (CHC) is the introduction of direct-acting antiviral drugs into treatment standards. They appeared in the WHO List of Essential Medicines for the first time since 2014. On the territory of the Russian Federation, the number of registered international nonproprietary names increased in 2014-2020 by 3.5 times and at the time of 2020 it was 10. Direct-acting antiviral drugs were included in the Vital and most Essential Drugs List since 2017 (10 %), and by 2020 this indicator had increased by 7 times. In general, in the Russian Federation since 2017, there has been progress in solving a global problem through the use of more effective drugs, which cannot be said about the regions of our country. So, in the Volgograd region, not a single Direct-acting antiviral drugs of preferential leave for the treatment of CHC on an outpatient basis has been registered.