The anatase nanoparticles are stabilized with titanium tetraisopropoxide Ti[OCH(CH₃)₂]₄ and isopropyl alcohol without surfactants suitable for biological studies. We showed that the hydrodynamic radii in suspensions depend on temperature and the duration of hydrolysis, whereas the composition (a mixture of anatase with brookite, anatase, brookite, and rutile) and the sizes of crystallites (X-ray), nanoparticles, and aggregates (SEM) in the dried state are mainly dependent on the pH of the environment. The nonphase of the samples stems from coherent intergrowth of unit cells of anatase and brookite via geometric and structural complementarity. We found that photocatalytic activity (PCA; Rhodamine 6G model dye under UV radiation) depends on OH/H₂O ratio (adsorbed), whereas antimicrobial activity (AMA) in the dark depends on an amount of free water on the surface of nanoparticles according to X-ray photoelectron spectroscopy (XPS). We revealed that samples with the smallest sizes of nanoparticles of all levels possess the highest PCA and AMA relative to Staphylococcus aureus and Escherichia coli.

The transesterification of polyester with hydroxyl-terminated oligoesters represents a promising route for the chemical upcycling of polyethylene terephthalate waste. The single-stage melt process under investigation yielded value-added PET-based copolyesters containing up to 15 mol.% diethylene glycol and triethylene glycol units. The effect of comonomer content on the thermal properties and crystallization of the copolymers was studied. It was found that an increase in the number of oxyethylene groups in the comonomer leads to a greater decrease in the glass transition temperature and the isothermal crystallization rate. Diethylene glycol was shown to lower the equilibrium melting temperature more than triethylene glycol. Thus, during PET upcycling, the glass transition temperature decreased from 80 to 50 °C, and the melting temperature from 280 to 250 °C.

The work is devoted to the preparation and study of the structure and properties of low- molecular liquid crystals and, in particular, monomers with chiral additives of various natures for the forma- tion of chiral nematic mesophases. The possibility of obtaining such phases under conditions of polymerization with reversible chain transfer of mixture compositions with monomers and the study of the properties of the resulting mixtures were studied. Particular attention is paid to the role of chemical interaction between the components of composites from the point of view of stability and preservation of properties by such systems.

The article presents approaches to the preparation of copolymers of polymethylmethacrylate using azo dyes, as well as data obtained as a result of a number of reactions to obtain methacryloxy-functionalized dyes and their copolymerization with methyl methacrylate. Synthesis of such polymer particles can be useful in the field of medicine — immunodiagnostics, latex agglutination reaction, flow cytometry, microspheric multiplex analysis.