CHEMICAL PROBLEMS

The effect of components ratio in a polymer mixture, and also of cross-linking agent (dikumil peroxide) and formation of gas (azodikarbonamid) on macrostructure and the basic physical-mechanical properties of elastoplastics foam has been examined. It showed that a variation of the ratio of these components is possible within a wide range of apparent density and […]

The effect of components ratio in a polymer mixture, and also of cross-linking agent (dikumil peroxide) and formation of gas (azodikarbonamid) on macrostructure and the basic physical-mechanical properties of elastoplastics foam has been examined. It showed that a variation of the ratio of these components is possible within a wide range of apparent density and […]

The influence of phosphorus, gallium and their compounds on catalytic properties of H-pentasile in the process of aromatization of n-heptane has been considered. It established that higher promoting effect on selectivity of transforming aromatic carbohydrates reacts at joint modification of H-pentasile with phosphorus and gallium. In our experiments the selectivity of aromatization reacts to 76,2%.

As a result of carried out inivertigation it was detected that useless seeds as a waste of a rose Izabella grape were rich with biological active substances, concretely with karatinoids and tocopheroles. During implemented amount analysis by photometric method the general amount of the karatinoids and tocopheroles in the seeds of the rose Izabella grapes […]

Temperature dependence of electric conductivity of thin films CdSe obtained by electric chemical method. Type of conductivity and some semi-conductor constants (ΔЕ, Вuα ) have been identified.

The visible light significantly increases the catalytic activity of fullerenes. The irradiation of reaction mixture in the presence of С60/С70 leads to preferred formation of esters.

Process of desiccation of monoatomic alcohols of normal (C1-C5) and isomeric (C3-C5) structures by zeolites has been examined. Desiccation degrees estimated by calculacion of the following indices: a dynamic and equilibrium adsorption activities of an adsorbent layer towards water; a length of mass-exchange zone; a degree of utilization of the adsorbent layer and its working […]

The article discussed the results of study into peculiarities of radical homo- and copolymerization of allylic compounds, «degradation» chain transfer, typical for peculiar to polymerization of these compounds as well as the role of complexing agents polymerization of allylic monomers. Review of author¢s published works and other researcher in the field of radical copolymerization allylic […]

Process of sedimentation of hard particles of hydrophobized petropolluted earth in the water dispersive environment is connected to various forms of coagulation structurization of sedimentation deposit. The work present results of strained sedimentation of particles in the hard phase under the influence of gravity during setting of water suspension of petropolluted ground. Coagulation of the […]

Ethylene oligomerization reaction in the presence of complex catalytic systems consisting of sterically hindered bi- and bis-phenol compounds of zirconium, containing various cycloalkyl and tert-butyl substituents in aromatic ring, and alkylaluminium chloride, has been investigated. Their high efficiency in ethylene oligomerization reaction identified. It has been found that in the presence of catalytic system consisting […]