Preview

Fine Chemical Technologies

Advanced search
Vol 6, No 3 (2011)
View or download the full issue PDF (Russian)

SYNTHESIS AND PROCESSING OF POLYMERS AND POLYMERIC COMPOSITES

3-22 35
Abstract
The results of investigations on the mechanism and kinetics of the polycondensation of organosilanols are reviewed. The review consists of two parts. In the first part data on the kinetics of monomer condensation are given. The second part considers the condensation of siloxanols.
23-27 41
Abstract
In this article matters of investigation of basic physical, chemical and technical properties of a product of recycling rubber by means of high-temperature shift crushing deformation are considered.
28-33 44
Abstract
In this article the technique of polymer nano- and microfiber materials electrospinning and its implementation are considered
34-39 78
Abstract
The effect of the molecular weight of poly(N-vinyl pyrrolidone) solutions on the rheological properties, process stability and diameters of fibers produced by electrospinning was investigated. The critical value of the polymer concentration and molecular weight for a stable process of fiber electrospinning was obtained. Besides, the relationship between the molecular weight, on one hand, and the solution concentration and viscosity, as well as the process parameters and fiber diameter, on the other hand, was determined.

THEORETICAL BASES OF CHEMICAL TECHNOLOGY

40-43 57
Abstract
The sequence of the formation of multi-branched heptane isomers was studied in liquid and gaseous phases over different liquid and solid superacid catalysts. It was found that this sequence does not depend on the phase state, catalyst nature, and conditions, evidencing in favor of common reaction mechanism. The 2,4-dimethylpentane transformation into 2,2-dimethylpentane can be explained by the intermediate formation of cyclobutyl carbocation.
44-51 45
Abstract
In a full-sized experiment the possibility of different azeotropic mixtures separation with the use of 1-butyl-3-methylimidazolium chloride an ionic liquid, [bmim][Cl] as an entrainer was proven.
51-54 43
Abstract
Theoretical analysis of simple recrystallization of substances from solutions with the use of binary solvents was carried out. The influence of various technological parameters on the yield of separation products and power consumption were determined.
55-60 48
Abstract
A method of singular point type determination for a 4-component azeotrope is proposed. The method deals with 2-dimensional structures known to be boundary surfaces of the residue curve map.
61-71 44
Abstract
Different properties and types of α-1-lines for ternary zeotropic mixtures and ternary mixtures with one binary azeotrope are presented in a brief literature review.

CHEMISTRY AND TECHNOLOGY OF INORGANIC MATERIALS

72-76 35
Abstract
Influence of electrolysis parameters (concentration of silver in the electrolyte, current density, additives of surface active agents, a reversive current) on the granulometric composition and structure of silver powders is considered. Optimum conditions of the process are revealed.
77-81 46
Abstract
Theoretical calculations of the potential energy surfaces along the minimum energy pathway have been performed for elementary step-wise dehydration reactions of molecules and ions of light-metal hydroaluminates (Li, Na, K, Mg, Ca and Zn) by using the density functional (B3LYP) and coupled cluster (CCSD(T)) methods with the 6-311++G** basis set.
82-86 54
Abstract
Some properties of lithium-indium complex phosphates in the previously investigated Li3PO4-Na3PO4-InPO4 ternary system were studied. Ionic conductivity of isolated phases at 300ºC was measured. Vibration spectra of the investigated compounds were registered for 6Li → 7Li substituted samples from 1400 to 200 cm-1 frequency range. Isotope shifts under 6Li → 7Li substitution were observed for all the complex phosphates. The obtained results allowed to reveal intrinsic lithium sublattice vibration and to relate complex phosphates structure to ionic conductivity magnitude.
87-90 47
Abstract
The platinum and palladium nanoparticles on the porous silicon were synthesized by radiation - chemical reduction in the solution of reversed micelles. The Pt and Pd nanoclusters obtained are electron deficient.

MATHEMATICAL METHODS AND INFORMATION SYSTEMS IN CHEMICAL TECHNOLOGY

91-99 53
Abstract
The problem of the flat harmonic wave expansion in ultra-relativistic media is considered. Numerical solutions of dispersion equations for the waves of small amplitudes were obtained within the framework of different local relativistic models and non-local Alexeev hydrodynamics. It is shown that only non-local theory leads to meaningful results.
100-105 40
Abstract
An estimation method was developed for solutions of boundary problems of thermal conductivity of the generalized type.
106-110 41
Abstract
The integral correlations for analytical solutions to the generalized equation of transient heat conduction simultaneously in the Cartesian coordinate grid, cylindrical and spherical coordinate systems for the limited fields of the canonical type were constructed. The theory of integral transformations and the method of Green's functions were developed.
111-115 39
Abstract
Within the limits of the classical mechanics for planets of the Solar system a new form of gravitational potential is suggested. The following effects are considered: perihelion advance of the planets, deviation of light beams in the field of the Sun, and gravitational displacement of spectral lines.
116-119 40
Abstract
This article is dedicated to the expansion of mathematical tools used to solve the problems of thermodynamics, in particular, problems in the theory of thermal shock. The authors used the method of Green's functions, which allowed simplifying the solution of the relevant problems.


ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)