(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: The influence of the Ti(III)/Ti(IV) molar ratio on the process of iron subgroup metal powders deposition was investigated. The rate and degree of metal reduction are shown to decrease, when Ti(IV) is introduced into a deposition solution, whereas under certain conditions that decrease is, but it is little. At the same time Ti(IV) introduced enables the concurrent side process of water reduction with Ti(III) complexes to be essentially suppressed.
Novikov G. I.
About hydrogen bonds in the family of methane, ammonia, water and hydrogen fluoride. pp. 11--17
Summary: Peculiarities of hydrogen bonds and their energetic characteristics in polymeric molecules such as HF, H2O, NÍ3 and CH4 have been analyzed, the thermodynamic characteristics of the above substances have been estimated on the correlation diagrams of DH°f,298/n and S°298/n values (n is the polymerization degree). The polymeriztion degrees of the substances in liquid been evaluated on the same diagrams. The hypothesis are discussed about the influence of water and ice germ structure on features of fog drops condensation and grows ander natural conditions.
Malashonok I. E., Barannikova T. I., Rudakov D. A.
Investigation of double condensed metaphosphates. pp. 18--22
Summary: The double condensed phosphates with the general formula MIÌII(ÐO3)3 have been investigated. The infrared spectra were used for indentification of the phosphates structure type. Peculiarities of phosphate structure formation in dependence on the synthesis temperature and cation nature were determined.
Summary: The dependense of electro-kinetic potential of water-fiber suspension which contains hydrodispersed synthetic rubber latexes as strenthening additives for board on the type and content of colloidal-chemical regulator and coagulant are investigated.
Goncharik I. I., Mozheiko F. F., Golubovich S. A., Ledovskaya Z. E.
Influence of aliphatic alcohols on foamforming ability of carboxylic acids sodium salts. pp. 27--29
Summary: The influence of aliphatic alcohols on foamforming activity of sodium salts of fatty acids (lauric, myristic, palmitic) has been studied. It has been shown the presence of alcohols enhances foamforming and stability of the foams formed.
Komarov V. S., Repina N. S.
Formation of adsorbent porousness by the "structure-in-structure" method. pp. 30--33
Summary: Possibility of adsorbents synthesis of the "structure-in-structure" method has been studied for the first time. It has been shown that this method unlike known ones permits porous materials with high sorption capacity as well as specific surface be obtained. It has been shown that with the rising of percent content of the modifying hydroxide in a mixture the Vs --modifing peroxide percent curve goes through the maximum, intensity of which is much higher than that for parent and modifying hydroxides.
Martsul' V. N., Shibeka L. A.
Interpolymeric reactions between poly-N,N-dimethyl-N,N-diallyloammonium chloride and heterofunctional polyelectrolyte -- sodium lignosulfonates. pp. 34--38
Summary: The transformation degree for homopolymer, poly-N,N-dimethyl-N,N-diallylammoniumchloride, and heterogenic polyelectrolyte, sodium lignosulfonate, in the interpolymeric reaction has been estimated. It was shown that the degree of sodium lignosulphonates transformation is various for the functional groups with the different pKa value and increases with the pH rising. The insoluble complex formed under sodium lignosulphonate deficiency is characterized by the higher degree of transformatuion in comparision with the stoichiometric polyelectrolyte complex.
Summary: Some peculiarities of formation and optical properties of nanosized silver particles in model layers (gelatin matrix with ultradispersed silver or AgHal distributed in it) were investigated. It was shown that in dependence on conditions of physical-chemical affects upon the layer the size of particles formed in it can be different as well as their shape. Conditions of silver nanofilaments formation in the mentioned layers were determined.
Telesh E. S., Vorob'eva T. N.
Processes of dissolution-reduction during tin cementation onto zinc. pp. 46--50
Summary: Tin cementation onto zinc from citrate solution which permits one to obtain the protective and decorative coating with the thickness 2--5 µm was investigated using AAS, XPS, AES, EM methods. The cementation reaction was found to be accompanied by the side process of zinc dissolution with the hydrogen generation. The dissolved zinc codeposits with tin and includes into the surface layers of tin film. The fact of zinc presence in the surface layers and its absence in the bulk of the coating proves the participation of codeposited zinc in the cementation reaction. The repeated processes of dissolution and codeposition show that zinc fulfils the function of cementation catalyst providing cemented tin films' thickness.
Sen'kov G. M., Nikitina A. M., Chuiko V. A., Udarov B. G., Lamotkin A. I.
Isomerization of a-pinen on sulfocationit. pp. 51--53
Summary: The influence of the substitution degree of H+ for Li+ cations onto sulfocationit surface on pinen isomerization has been investigated. The conversion of a-pinen and its isomerization into camphen are the most effective for the catalysis with the changing degree of 10%.
Chaplanova Zh. D., Agabekov V. E., Ivko A. A., Sharendo E. V.
Ionic implantation of thermally deposited films of polycyclohexadiene. pp. 54--57
Summary: Peculiarities of the 30 keV phosphorus ion implantation into thermally deposited films of polycyclohexadiene have been studied. It has been shown that the modified layer containing phosphorus is formed the functional composition and properties of which differs from that of the parent film.
Emelyanenko V. N., Roganov G. N.
Thermodynamic properties of aliphatic ketones. pp. 58--64
Summary: The thermodynamic fuctions for 2,4-dimethylpentanone-3,3-methylbutanone-2 and 3,3-dimethylpentanone-2 over the temperature range of 298.15--1000 Ê. have been determined on the basis of the molecular and spectral data. Additive calculations of entropy values of aliphatic ketones were carried out at 298.15 Ê. The absolute entropy values have been evaluated for twelve liguid and gasous ketones C6--C7.
Gromak V. V., Avakyan V. G.
Quantum-chemical calculation of the intermolecular H bonds energy for a-acetyl derivatives of five-membered cyclic b-dicarbonyl compounds. pp. 65--69
Summary: By the semiempirical methods AM1 and PM3 the energy values of intramolecular H-bonds in enolic tautomers of fivemembered carbo- and heterocyclic (a-acetyl b-dicarbonyl compounds have been calculated and relative thermodynamic stabilities of such tautomers have been estimated. It has been established that currently existing theoretical and experimental methods for determination of the H-bonds absolute energy values in enolic derivatives of b-diketones and b,b'-triketones can diminish the real energy values by 1.1--4.7 kcal/mol. It has been shown that in vapour phase (ideal gas approximation) all the b,b'-tricarbonyl compounds studied exist predominantly as exoenolic tautomers.
Ariko N. G., Filippovich L. N., Agabekov V. E., Shahab S. N., Malashko P. M.
Dichroism of colored polyvinylalcohol films. pp. 70--75
Summary: The results on studies of optical characteristics and polarization ability of the uniaxially oriented polyvinylalcohol films colored by the mixtures of diazodye, chinaldine red, indigo carmine and tartrazine were discussed. It hase been shown that the films prepared are able to polarize light over the visible (430--620 nm) region of spectrum.
Summary: Objects of the investigation involve pigmented compositions and vulcanizates on the basis of cis-isoprene and oil-extended butadiene- methylstyrene rubbers, stabilized by hindered amines and their combinations with IPPD -- industrial stabilizer of p-phenylenediamine type. In order to assess the efficiency of the suggested stabilizing mixtures and to study changes of the properties of rubbers under the influence of oxygen and high temperature the following techniques were used: determination of mechanical properties of vulcanizates before and after aging; determination of the fatigue endurance of the rubbers; IR spectroscopy of repeatedly disrupted total internal reflection (IRS RDTIR). The goal of the work was to develop stabilizing systems on the basis of hindered amines increasing the operation period of rubber goods.
Knizhnikov V. A., Potkin V. I., Petkevich S. K., Skripchenko A. S., Mikulich A. V.
Synthesis of N-chloracetyl-a-aminoacid. pp. 82--84
Summary: The N-acyl aminoacids RCH(NHCOR')COOH [R = Me2CH, Me2CHCH2, PhCH2; R' = CCl2 = CClCH2, C2Cl5CH2, C3SNCl2] were obtained by interaction of sodium salts of valine leucine and phenyl alanine with chlorides of trichlorovinyl acetic, 3,3,4,4,4-pentachlorobutanoic and 4,5-dichloroisothiazol-3-carboxylic acids. The structures of the compounds synthesized were confirmed on the base of IR, NMR 1H spectra and elementary analysis.
Summary: The inhibition of the 3,3',5,5'-tetramethylbenzidine (TMB) peroxidase-catalyzed oxidation by five substituted phenols with various structure -- o-aminophenol (o-AP); m-aminophenol (m-AP); 5,5-dimethyl-4-methoxycarbonyl-2-[2-(hydro-xyphenyl)-amino]-methylidene-cyclohexan-1,3-dion (RNH-PhOH); poly(3-aminodisulfidephenol) (poly(ADSP)); and 3-(2-hydroxyethylthio)-4,6-di-tert-butyl-pyrocatehole (InH4) has been studied at 20° Ñ in 0.015 M phosphate-citrate buffer, pH 6.4 (or 5.0) containing 5% of DMFA and 5% DMSO (or 10% of DMFA). An inhibition was quantitatively characterized by the inhibition constants Ki, M and the stoichiometric inhibition coefficient f meaning the radical number terminated by one molecule of inhibitor. Ki is minimum for poly(ADSP) and equaled to 3.0 • 10-5 M. The f values are maximum for o-AP (2.6) and InH4 (1.8).
Summary: The influence of the composition of formic acid / water / glycerine solvents on the structural, strength and filtration properties of aliphatic polyamide membranes formed in water mixtures has been studied. The formation of the permeable films has been established within the limited region of composition.
Summary: The radiogeochemical barriers in a river stream linked with outcrops of peat bog, marsh ore, clay and loam are characterized.
Kuznetsov V. A., Generalova V. A., Veremchuk S. N.
Geochemical properties of alluvial sediments as radio-chemical barriers. pp. 99--103
Summary: The determination of the absorbing capacity and absorbed cations composition of main alluvial sediments of the Sozh river flood-plane, their sorption and desorption abilities for Sr-90 and Cs-137 has been carried out.
Strakh I. I., Shmanay I. I., Babkina O. I.
Features of 137Cs distribution among conjugate elementary landscapes of Polessje type. pp. 104--107
Summary: The features of distribution of physico-chemical forms of 137Cs in the conjugation of elementary landscapes of palessje type: H/E/e, H-H-Fe/TS/fg, H-Fe/S/Fg was studied. An immobile form dominates in the structure of 137Cs. The barrier geosystem H-H-Fe/TS/fg is characterized by the high lateral and radial contrast in the distribution of 137Cs between all its forms. The part of 137Cs mobile forms increases to 15--25% in the peaty humus podsol gley soil. This explaines the increase in the median rate of 137Cs migration in the given geosystem as well as the sharp (in 4 times) increase in intensity of biological absorption of 137Cs by the cover surfaces.
Summary: It has been proposed to use emulsion of oil soft asphalt for impregnation of road concrete products exploited under influence of aggressive medium. Using the emulsions allow to reduce intensivity of corrosion processes more than twice, to decrese water absorption, to change porous structure and to reduce capillary suction of water because of hydrophobic coating formation on the concrete surface.
Chernaya N. V., Lamotkin A. I.
Optimization of paper pulp composition for gluing in neutral medium. pp. 111--115
Summary: The influence of pupl composition on hydrophobic and strength properties of paper at gluing in neutral medium using the glue colophony composition TMVS-2N has been investigated as well as the degree of filler confinement and dry substances contents in register water. The recommendation on production of paper and board of high quality and optimization of pupl composition have been suggested.
Aleksandrovich Kh. M., Dichkevich N. V.
Liquid fertilizers on the basis of urea and calcium nitrate. pp. 116--119
Summary: It has been proposed to use liquid highconcentrated on nitrogen fertilizers on the basis of urea and calcium nitrate obtained in the process of nitrogen-acidic decomposition of phosphates.
Kosmacheva T. G., Globa I. Yu., Ariko N. G., Agabekov V. E.
The influence of uniaxially oriented iodine containing polyvinyl alcohol films on their optical characteristics. pp. 120--123
Summary: Results on comparison studies of optical characteristics and polarization ability of iodine polarizers produced by "dry" (on air) and "wet" (in a solution) methods of stretching of iodine containing polyvinyl alcohol films are discussed. It have been determined that films oriented by "wet" method are characterized by high and more stable transmittance and polarization ability as compared with films produced by "dry" method.
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