(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF CHEMICAL SCIENCES
Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus
| Proceedings of the National Academy of Sciences of Belarus (Vestsi Natsiyanalnai Akademii Navuk Belarusi) SERIES OF CHEMICAL SCIENCES Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Summary: Features of covering formation on the surfase of carbon steel in the sodium silicate aqueous solution have been investigated.
Vorob'ev N. I, Dormeshkin O. B., Novik D. M.
Investigation of process of potassium nitrate preparation by the conversion method. pp. 8--13
Summary: The process of potassium chloride conversion by ammonium nitrate for the purpose of potassium nitrate production has been studied. The influence of different technological parameters on the conversion process has been investigated, and the optimal technological conditions have been proposed. It has been shown, that introducing of a additional stage of washing out allous the residual contents of chlorine to be decreased down to 0.12--0.64%. Possible conditioning of the parent solutions in order to obtain the liquid fertilizer, such as KAC-K, with the fertilizer content less than 30% has been studied.
Bobkova N. M.
Borate glasses as bases of ultra-low-melting low-lead glazes, fluxes, and solders. pp. 14--17
Summary: Possible application of borate systems for synthesis of low-melting glasses has been studied. The data on the phase diagrams of the systems with alkaline and alkaline earth metals and on thermal exspansion of the glasses as well as the results of low-lead glass synthesis on the basis of the borate systems are presented.
Summary: The process of aluminum hydroxide modification with the specimens of iron hydroxides obtained from 10-, 20- and 50% solutions of FeCl3 as well as with chromium and zirconium hydroxides has been studied. Both the characteristics of structural changes of obtained samples in dependence on the percent econtent of hydroxide-modifier and peculiarities of changing their sorption capacity and specific surface have been studied. It has been shown that the maximal modification takes place when the sorption capacity of an hydroxide-modifier is equal to that of modified hydroxide or exceeds it.
Summary: The possibility of dynamic preconcentration of copper, zinc, lead, cadmium, nickel and manganese ions from their water salt solutions with a fibrous chelating sorbent FIBAN X--1 has been investigated. High efficiency of the sorbent and its usefulness for analytical applications have been proved,
Summary: The results on synthesis of tungsten trioxide particles and their application as disperse phase in electrochemical deposition of composite - nickel material are presented. It has been shown that varying the condition of tungstic acid gel destruction (mechanical or thermal) allows the dispersed tungsten oxide particles of different sizes and crystal habit to be prepared. It has been shown that codeposition of the tungsten trioxide particles with nickel from aqueous electrolyte during electroplating improves the wearing properties of coating.
Nikolaichik A. V., Martinkevich A. A., Prokopchuk N. P., Krut'ko E. T.
Changing thermal properties of polypyromellitimide during its chemical modification. pp. 32--35
Summary: The influence of modifiers on thermal properties of polypyromellitimide, such as initial temperature of intensive thermal oxidative destruction, temperature and completion degree of imidization of polyamidoacid composition, temperature of spatial network structure formation in specimens, temperature of residual solvent and moisture extraction from the film specimen, has been studied. The dependence of the activation energy of thermal oxidative destruction of the composition on nature and quantity of modifier has been investigated. The obtained data give us a clear understanding of the mechanism of the influence of modifying additives on composition properties and to a certain degree help to predict the main characteristics of new polymer materials, reducing material and time expenses of their development.
Starobinets G. L.†, Rakhman'ko E. M., Borshchenskaya T. I., Koroleva S. V.
Molecular sorption of aliphatic a-aminoacids by monocarboxylcellulose from several binary media water -- organic non-electrolyte. pp. 36--41
Summary: The process of molecular sorption of zwitter -- ion forms of four aliphatic a-aminoacids (from glycine to leucine) by a carboxylic cation exchanger -- monocarboxylcellulose in H+ form from water -- ethanol, water -- isopropanol, and water --aceton solutions of variable composition has been studied at 293 K. It has been demonstrated that the sorption constants and the thermodynamic parameters of the aminoacids are independent on the nature of the binary water--organic solutions.
Zhavnerko G. K., Gracheva E. A., Agabekov V. E.
Peculiarities of molecules packing of derivatives of high fatty acids in Langmuir films. pp. 42--45
Summary: Langmuir--Blodgett (LB) monolayers of behenic acid and purified beeswax were prepared on graphite and on mica surfaces by the horizontal precipitation method. The adsorbates were studied by atomic force microscopy and the molecular structures of monolayer films were attained. The lattice parameters of molecules packing in a monolayer film of behenic acid on mica surface and in a monolayer of beeswax on graphite surface were determined. It was established that the nature of mica surface render an influence on hydrocarbon tails packing as opposed to packing of derivatives of fatty acids on graphite surface.
Khautari Kh. Kh., Mironova T. V., Sosinovich Z. I., Soldatov V. S.
Selectivity of exchanging sodium with calcium on fibrous sulfocationit. pp. 46--49
Summary: The equilibrium of the main model process of water softening, that is exchange Na+ with Ca2+ was studied. The selectivity constants and equilibrium coefficients of the exchange were calculated, FIBAN K--1 is to be shown an effective and easily regenerable material for water softening,
Serezhkina S. V., Shevchenko G. P., Muravitskaya E. V., Sviridov V. V. †
Investigation of thermally stimulated processes taking place in the system SiO2--GeO2 obtained by the sol-gel method. pp. 50--53
Summary: The peculiarities of the thermostimulated processes occuring in SiO2--GeO2 systems obtained by the sol-gel method with different precursors were investigated. The compositions and the conditions which provide homogeneous distribution of the components in the system are specified.
Summary: A method of synthesis of long chain carborane-, adamantane- and 4,41-biphenyl containing esters by the reaction of corresponding chloroanhydrides with 1-(penta- and hexa-)decanols in presence of pyridine has been described.
Tarasevich V. A., Zhavrid A. S.
Dehydroamination of 4-cyclohexylcyclohexanols by ammonia. pp. 57--60
Summary: The dehydroamination reaction of 4-cyclohexylcyclohexanols with ammonia on nickel catalysts hase been studied.
Summary: The geometry refinement for the five preferred structures of immunodominant epitope of ĶIVsub Pashkovsky F. S., Schukina E. M., Lakhvich F. A. Summary: Synthesis of 10-oxa-13-thiaprostanoids of the thiaenone series containing 3-methoxyphenyl- and 3-hydroxyphenyl substituents in the a-chain on the basis of the corresponding arylmethylidene acyl derivatives of tetronic acids is described. The arylmethylidene acyl derivatives were obtained during catalysed by pyperidine condensation of 3-acetyl tetronic acids with 3-methoxybenzaldehyde.
Tarun E. I., Adzerikho I. E., Metelitsa D. I. Summary: The effect of the radical HO. acceptors -- mannitol, dimethylsulfoxide (DMSO), dimethylformamide (DMF), ethanol, butanol, and octanol on the soya-bean urease inactivation has been studied in aqueous solutions at 46°C and under action of low-frequency ultrasound (US, 27 kHz, 60 W/cm2). DMSO, butanol and ethanol stopped completely the US-inactivation of urease in aqueous solution, whereas mannitol, DMF and octanol inhibited that at 46°C and under US-treatment of solution. The most effective protector of urease was ethanol, that eliminated the US-inactivation of urease and supported its thermoinactivation on a low permanent level. The data obtained prove the important role of active radicals in the urease US-inactivation (27 kHz, 60 W/cm2) at 46°C.
Summary: New polyfunctional amino compounds based on copolymer of acrylonitrile/polyvinyl chloride / sodium styrene sulfonate were used for synthesis of nanofiltration membranes.
Burdovitsina L. I., Domovskaya T. G., Mozheiko F. F. Summary: The stabilizing effect of ashes of thermal electric power plant on foaming capacity and on physical-mechanical properties of foam-ash concrete has been studied.
Chernaya N. V. Summary: The influence of dispersity and x-potential of the system consisted of prodacts of colophony modification and aluminum sulfate on hydrophobic properties of paper and board has been investigated. The scheme of emulsion introduction into the main technological process of hydrophobic paper production in acidic and neutral media has been proposed.
Tutaeva N. L., Markina A. Ya., Mozheiko F. F. Summary: The effect of salt-containing powder modification by petroleum-polymeric drying oil on filled polyethylene has been studied.
Dudarchik V. M., Kovrik S. I., Smychnik T. P. Summary: Peat humic preparations can be used to purify chromium containing solutions.
Agabekov V. E., Ariko N. G., Ivanova N. A. Summary: The results of investigations devoted to developing polarizing films on the basis of oriented polyvinyl alcohol films containing molecular iodine or organic dyes and in liquids crystal indicators are discussed. The article contains data about initial materials, methods and conditions of the preparation polarizing film and transmitting polarizer, the formation light reflective / transflect layers on the surface of transmitting polarizer and adhesive glue layer for joining a polarizer and LC-indicator.
Ol'khovik V. K., Kalechits G. V., Agabekov V. E. Summary: Owing to the fact that a new technology of isolation of dimethyl 4,4'-biphenyldicarboxylate out of a stillage residue of DMT distillation has been developed his product could become easily accesible and cheap raw material for fine chemical production. Aspects of using both 4,4'-biphenyldicarboxylic acid and its dufferent derivaties as key interdiates for synthesis of new polyconjugated aromatic and heteroaromatic compounds containing a biphenlic fragment are discussed in this article.
Synthesis of 10-oxa-13-thiaprostanoids on the basis of condensation products of3-acetyl tetronic acids with 3-methoxybenzaldehyde. pp. 67--71
Influence of hydroxyl radicals acceptors on urease inactivation by low-frequency ultrasound. pp. 72--77
TECHNICAL CHEMISTRY AND CHEMICAL TECHNOLOGY
Movchanskii M. A., Pratsenko S. A., Bil'dyukevich A. V., Shunkevich A. A.
Application of polyfunctional amine compounds on the basis of copolymer of acrylonitrile and vinylchloride in preparation of composite nanofiltration membranes. pp. 78--81
Influence of foam formers on physico-mechanical properties of foam-ash concretes. pp. 82--85
Peculiarities of hydrophobisation of paper and board with products of tallol colophony modification. pp. 86--88
Properties of polyethylene filled by modified clay-salt powder. pp. 89--93
Purification of chromium containing solutions by peat humic acids. pp. 94--97
Thin film polarizers for liquid crystal element of information reflection. pp. 98--112
4,4'-Biphenyldicarboxylic acid as initial raw material for low-tonnage chemistry of Belarus. pp. 113--119
SCIENTISTS OF BELARUS
Ivan Ivanovich Lishtvan (To the 70th anniversary). pp. 120--123
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