Scientific Journal of KubSAU

Polythematic online scientific journal
of Kuban State Agrarian University
ISSN 1990-4665
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181 kb

RESEARCH IN MICRODEFICIENCY OF POLYMERS (ELASTOMER COMPOSITIONS) UNDER UNIAXIAL DEFORMATION

abstract 1271703062 issue 127 pp. 885 – 894 31.03.2017 ru 36
Macrodeficiency of polymeric materials, including the pervasive one, is a consequence of the development of initial microdefects which appear in polymers both due to external factors and during their processing. This article solves the task of identification the interrelation and interdependence of structural microdefects of various polymeric materials, consisting in the estimation of the structural parameters under uniaxial deformation. It is experimentally shown that the process of changing microdefects in the material bulk begins to flow more intensely during deformation of the material, having anisotropic structures in the bulk. Change of the parameters of microdefects is not observed compared to the starting material at small quantities of the deformation. In the area of deformation corresponding to the transition of the material from isotropic to anisotropic state parameters of microdefects do not depend on the degree of deformation of the sample, and abrupt changes of the parameters of microdefects are observed after completing the formation of anisotropic patterns. It is shown experimentally the identity of the parameters of microdefects in the bulk material (rubber-based natural caoutchouc) during deformation with the quantities of local deformations at the edge of the artificially created macrodefects. Under uniaxial deformation more than 280-300% and the growth of the quantities of local deformations come out at the edge of the artificially created macrodefects and normalized linear dimension k and decrease the total number n of microdefects
190 kb

MATHEMATICAL MODEL OF THE CORRECTION OF PH SOFTENED WATER IN A LONG CHANNEL OF ELECTRODIALYSIS WITH BIPOLAR MEMBRANE

abstract 1261702002 issue 126 pp. 33 – 49 28.02.2017 ru 40
Theoretically and experimentally, we investigated the process of adjusting the pH of natural water of hydrocarbonate class electrodialyzer with bipolar membranes with channel length of 40 cm. We experimentally measured concentration of components, pH of the solutions in alkaline and acid channels of electrodeposition depending on the current density. The article describes a mathematical model for long channels; to scale the mass transfer characteristics of the process there was applied and verified a method of compartmentalization, which gave the possibility to calculate the dependence of the component along the channel length at different velocities of flow of the solution. Numerical calculations were compared with experimental data on electrodialyser of 10 cm and 40 cm length
498 kb

DEVELOPMENT OF A METHOD FOR FIXING PERFTORSULFOPOLIMER MF-4SK ON A HETEROGENEOUS MEMBRANE-SUBSTRATE

abstract 1251701015 issue 125 pp. 223 – 234 31.01.2017 ru 122
The article illustrates the results of the research dedicated to finding a method of combining two polymeric materials - ion-exchange membranes having different chemical nature. It shows a method of applying a homogenous film MF 4SK on the surface of the heterogeneous membrane substrate to produce a chemically and mechanically stable asymmetric bipolar membrane. We have selected membrane substrate ensuring the best electrochemical performance
220 kb

ELECTRICAL CONDUCTIVITY OF IONEXCHANGE MEMBRANES IN SOLUTIONS CONTAINING CARBOXYLIC ACIDS

abstract 1241610032 issue 124 pp. 549 – 562 30.12.2016 ru 147
The article presents the experimental results of the study of the concentration dependence of the electrical conductivity of heterogeneous ion-exchange membranes that are in contact with solutions of weak electrolytes - carboxylic acids. It is shown that in this case the membrane conductivity is higher than the conductivity of the solution, wherein the conductivity of cation exchange membranes substantially greater (by an order of magnitude) than the conductivity of anion exchange membranes. This fact must be considered when designing the actual electrodialysis processes of processing solutions containing organic ions. The work identified the need to develop modern ideas about transport and the structural organization of ion-exchange materials, to describe the structure of the ion-exchange membranes that are in contact with weak electrolytes solutions
258 kb

PERSPECTIVE MODIFIERS FOR ANIONEXCHANGE MEMBRANES BASED ON POLYMERS WITH QUATERNARY NITROGEN ATOMS, WHICH INCLUDED IN FIVE- AND SIX-MEMBERED HETEROCYCLIC RINGS

abstract 1231609085 issue 123 pp. 1256 – 1267 30.11.2016 ru 152
The present work describes the chemical synthesis of poly-N,N-diallyl pyrrolidinium bromide and polyN,N-diallyl morpholinium bromide - high-molecular compounds containing quaternary nitrogen atoms, which included in two five- and/or six-membered heterocyclic rings. These polymers are perspective modifiers for industrially produced anion-exchange membranes, the use of which should significantly improve the resistance to degradation of the membranes at over-limiting current regimes. The structure of obtained polymers was characterized by FTIR, 1H and 13C NMR spectroscopy. The optimal reaction conditions, which increase the yield of desired products, were defined. It is shown that is preferable to use 1-butanol as a solvent and benzoyl peroxide as an initiator
140 kb

SYNTHESIS OF SUBSTITUTED ISOXAZOLO[5,4-b]PYRIDINE AND THEIR ANTIDOTE ACTIVITY

abstract 1221608034 issue 122 pp. 471 – 480 31.10.2016 ru 145
To develop the novel herbicide antidotes for the sunflower vegetative plants, the group of chemical compounds, belonging to the derivatives of isoxalopyrazolopyridines was synthesized and their antidote activity both in the laboratory and field experiments was studied. The compounds with a high antidote effect were found
139 kb

INVESTIGATION OF ASCORBIC ACID ADSORPTION ON KSMG SILICA GEL

abstract 1191605091 issue 119 pp. 1356 – 1365 31.05.2016 ru 214
The article studies adsorption of ascorbic acid on KSMG silicagel. The experimental results, the basic thermodynamic characteristics of ascorbic acid adsorption on oxide silicon have been used for treatment of adsorption mechanism of ascorbic acid on silica KSMG. Results of the study ascorbic acid adsorption on silica gel KSMG may be used for further identification of it in the various objects
126 kb

RESEARCH IN MICRODEFICIENCY OF POLYMERS (RUBBERS AND RUBBERIZED FABRICS) USING EXPRESS TECHNIQUE OF ASSESSMENT BY THE SORPTION AND WEIGHT METHOD

abstract 1181604048 issue 118 pp. 817 – 826 29.04.2016 ru 358
Macrodeficiency of polymeric materials, including the pervasive one, is a consequence of the development of initial microdefects which appear in polymers both due to external factors and during their processing. In the article, the problem of the detection of structural microdeficiency of various polymeric materials through an assessment of their structural parameters is solved. The considered materials possess approximately identical degree of crystallinity (60 – 66%), but different density. The express assessment technique of polymeric materials microdeficiency by the sorption method with the use of the academician M. M. Dubinin’s theory of volumetric micropore filling is developed and evaluated. On the basis of a quantitative assessment of sorption processes in polymeric materials, including elastomeric compositions – rubbers and rubberized fabrics, the existence of the initial local microdefects arising in the course of synthesis is established. In real polymeric materials, including elastomeric compositions – rubbers and rubberized fabrics, the existence of the initial local microdefects arising in the course of synthesis is established (the number of microdefects n varies from 1x1017 sm-3 to 6x1019 sm-3 , and the rated linear size k – from 2 nm to 7 nm). The general reduction of microdeficiency in rubberized fabrics in comparison with initial rubber is revealed and rationalized
483 kb

STUDY OF THE INTERACTION OF POLYSTYRENE-AZO-O-PHENOL-AZO-RHODANINE WITH ZINC IONS AND CADMIUM

abstract 1181604067 issue 118 pp. 1086 – 1096 29.04.2016 ru 311
Since the industrial revolution a huge amount of pollutants emitted annually into the water most of which is occupied by toxic metals. These metals widely distributed in the environment and of accumulation of a threat to human health. It is known, that cadmium and zinc at high concentrations have a negative impact on nature. In modern wastewater treatment technology we widely use polymeric sorbents with chelating properties. The use of polymeric chelating sorbents (PCS) usage allows separating individual or group trace elements from large volumes of solutions of complex composition, lowering the limit of detection, eliminating or reducing significantly the impact of macrocomponents which increases the cleaning efficiency. The article presents the results of a study of conditions of interaction of zinc (II) ions and cadmium (II) with PCT - polystyrene-azo-o-phenol-azo-rhodanine. We found the optimal values of the conditions for zinc (II) ions and cadmium (II) sorption. We investigated the effect of interfering of the macro- and micro- water components with the sorption of the ions studied. Maximum desorption of metal ions is achieved by washing the concentrate with 10 ml of 2M hydrochloric acid. The data indicate availability of the investigated sorbent for concentration and separation of zinc (II) ions and cadmium (II)
131 kb

QUANTITATIVE AND QUALITATIVE DETERMINATION OF ENZYMESANTIOXIDANTS CONTAINED IN HORSERADISH GROWN IN THE ASTRAKHAN REGION IN THE SUMMER AND AUTUMN

abstract 1181604089 issue 118 pp. 1377 – 1386 29.04.2016 ru 298
The article is devoted to the study of enzymesantioxidants contained in horseradish root. The article provides a detailed analysis of the sources of information, aimed at clarifying the content of enzymesantioxidants contained in horseradish root, grown in the Astrakhan region in the autumn and summer. During the analysis of the literature, it was found that the content of enzyme-antioxidants in the root of the horseradish is not constant and depends on climatic conditions, planting time and harvest time. The content of antioxidants in the root of horseradish grown in the Astrakhan region in the summer-autumn period was studied using by the method of A.N. Bach and A.I. Oparin. 2 g of horseradish roots contains the number of enzymes - antioxidants able to expand for 30 min (1,547 • 100) / (20 • 1) = 77.35 mg of hydrogen peroxide in 1 min - 2.56 mg. 1mkmol As hydrogen peroxide is 0.034 mg, in 2 g horseradish contains 76 E enzyme - antioxidants (or E 38 1 g horseradish). The results of this work will form the basis for the creation and study of new enterosorbent with antioxidant functions. Enterosorbent prepared by adsorption on starch antioxidants such as peroxidase, catalase, and ascorbic acid, from aqueous extracts of plant material
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