Химия

The viscometric properties of diluted solutions of cellulose diacetate in dimethylsulfoxide in a temperature range 25-65°С were studied. The concentration dependence of the reduced specific viscosity is linear. The limiting viscosity [η] value regularly decreases as temperature grows and the viscosity-average molecular weight of the polymer decreases. The Mark – Kuhn – Howink constants have been determined.

Phase equilibria and critical phenomena in cut 1 of the quaternary system water - pyridine - butyric acid - potassium chloride whose constituent ternary liquid system had a closed binodal curve were studied by means of the visual-polythermal method within 5-80°C. The volumes of two monotectic states in the composition tetrahedron have been found to be in contact via critical tie lines with increasing temperature.

Results of studying thermal destruction some L-α-aminoacids are resulted. Typical stages and speed thermal destruction depending on character of a radical of aminoacids are shown and characterised. Temperatures of thermal decomposition of the studied aminoacids are resulted.

Information about test-methods discovering and quality determination pesticides, polycyclic aromatic hydrocarbons, hydrocarbons of oil, phenol and it’s derivative, halogen- and nitrogen-containing organic substances, surfactants in water environment. There are different methods indication analytical signal for appreciation of containing analyzing components and ranges and low levels determining containing. Different test ways are presented used for express test indicated mentioned organic substances in some object.

There were considered and analysed main scientific and pedagogical problems which were described in investigations of Professor Isaac Mustafin in Saratov State University in the fields of organic, analytical, physical, biological, caustibiolite's chemistry and of the history of science. Also there was given review of the works of different investigators of I.S. Mustafin's scientific inheritance.

Industrial metal-cement catalyst NKO-2-3, GTT, NTK-10-2 is investigated. Catalytic activity of metal-cement catalysts for flue gases neutralization under oxidation and reduction activation at 350°C is studied.

A lyotropic cubic LC phase stable in wide ranges of temperature (0–90°C) and dendrimer concentration (1.7–36.5 wt %) was detected in the binary system CCl₄ + an LC third-generation dendrimer with cyanobiphenyl mesogenic groups. A concentration phase transition from an isotropic solution to an LC state was observed by means of viscometry.

Phase equilibria and critical phenomena in the ternary system potassium nitrate – water – methyldiethylamine, where a constituent binary liquid system is characterized by phase separation with a lower critical solution temperature (LCST), were studied by means of the visual-polythermal method within 25–55°C.

A novel scheme of the isothermal phase diagram of the quaternary system salt + three solvents with three liquid-phase equilibrium (its ternary liquid subsystem to be characterized by a band-like delamination region) was deduced by means of the topological transformation method.