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CHEMISTRY

ISSN 2227-6017 (ONLINE), ISSN 2303-9868 (PRINT), DOI: 10.18454/IRJ.2227-6017
ПИ № ФС 77 - 51217, 16+

DELIVERY LIGAND IN MICELLES IN THE DIRECT SYNTHESIS COMPLEX COMPOUNDS

Posted in 2014, CHEMISTRY, Issue October 2014 | 0 comments

The interaction of the copper surface with salitsilalanilinom in dimethylformamide. Delivery of a ligand to the surface of the copper -las carried in micelles of a nonionic surfactant surfactant. The critical micelle concentration of the surfactant in the dimethylformamide ( 15%).

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POLYMER NANOCOMPOSITE USED AS A STRUCTURAL MATERIAL FOR RAILWAY

Posted in 2014, CHEMISTRY, Issue October 2014 | 0 comments

The article describes how to prepare polymer compositions based on a thermoplastic polymer with nanoparticle inclusions of silica dioxide, how to identify important physico-chemical properties of the composition, and how to design the dowels structure of mounting assembly of rail fastening, based on proposed composite material.

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RESEARCH OF PROCESSES OF DETERMINATION OF GOLD CONTENT IN PRODUCTS OF GOK “NEVSKY “LLC ” DRUZA”

Posted in 2020, CHEMISTRY, Issue № 07(97) July 2020 | 0 comments

The article deals with the processes of determining the gold content in the products of the «Nevsky» mining and processing plant of«Druza» LLC. The activity of the assay and analytical laboratory to determine the content of gold in gold-containing products was investigated. The composition and structure of AAL GOK «Nevsky» LLC «Druza» is considered. The paper describes methods for determination of gold content in the products: atomic absorption method, titrimetrically method and Assay-gravimetric method. The principles of internal and external laboratory control in the AAL of a gold mining company are defined.

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SYNTHESIS OF HETEROCYCLIC COMPOUNDS IN COMBINATION OF 3- (4-METHYLPHENYLHYDRAZONO) -2,4-DIOXOPENTANE ACID WITH NH-MONONUCLEOPHILES

Posted in 2020, CHEMISTRY, Issue № 06(96) June 2020 | 0 comments

Claisen acylation of acetone with diethyl oxalate in the presence of sodium metal in toluene with further interaction with aryldiazonium chlorides taken in equimolar ratios in a neutral medium leads to the formation of ethyl esters of 3-arylhydrazono-2,4-dioxopentanoic acids.

Interaction of 3-arylhydrazono-2,4-dioxopentanoic acid ethyl ester with NH-mononucleophiles yielded new 1-aryl-5-hydroxy-4 – [(4-methylphenyl) hydrazono] -5-methylpyrrolidin-2,3,4-trions, their physicochemical characteristics are determined. The synthesized compounds are highly melting substances soluble in ordinary organic solvents, insoluble in water.

Structural features of the obtained compounds were established on the basis of mass spectrometry, IR, and NMR 1H spectroscopy. In the mass spectra of the isolated compounds recorded in the electrospray mode, signals of protonated and cationized molecules are observed. Signals of all proton-containing groups were detected in NMR 1H spectra, the formation of an intramolecular hydrogen bond with an oxygen atom of the OH group, or an oxygen atom in position 3 of the pyrrolidine ring is shown.

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SYNTHESIS, STRUCTURAL FEATURES AND BIOLOGICAL ACTIVITY OF BIS-(1-OXO-4-PHENYL-1-ETHOXYBUTANE-2,4-DIONATO)- AND BIS-(1-BUTOXY-5-METHYL-1-OXYHEXANE-2,4-DIONATO) METALS(II)

Posted in 2020, CHEMISTRY, Issue № 05(95) May 2020 | 0 comments

The development of new promising biologically active compounds is the topical direction of organic synthesis. By condensation of alkyl(aryl)methylketones with dialkyloxalates, sodium oxoenolates with alkyl and aryl substituents were synthesized in this work. bis-(1-oxo-4-phenyl-1-ethoxybutane-2,4-dionato)- and bis-(1-butoxy-5-methyl-1-oxohexane-2,4-dionato) metals (II) are isolated by metal exchange of sodium oxoenolyates with copper, zinc and nickel salts. The structure of the obtained metal complex compounds is confirmed by spectral analysis methods. The authors has established biological activity of some bis-(4-alkyl(aryl)-1-oxo-1-alkoxyalkane-2,4-dionato)metals (II) with respect to three types of test organisms: S. Aureus, E. Coli, P. Aeruginosa.

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POLYMER MATERIAL FOR PROTECTION AGAINST ELECTROMAGNETIC INTERFERENCE

Posted in 2014, CHEMISTRY, Issue June 2014 | 0 comments

In the work presents results of the development of radiation-protective material on the fluoroplastic base matrix that can be used in equipment of the spacecraft to reduce electromagnetic interference.

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A STUDY OF CHANGE OF TEMPERATURE COEFFICIENTS OF LINEAR EXPANSION OF POLYMER COMPOSITES

Posted in 2014, CHEMISTRY, Issue June 2014 | 0 comments

In the paper we study the dependence of the temperature coefficient of linear expansion of polymer composites on the content of filler.

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EFFECT OF VACUUM ULTRAVIOLET RADIATION ON HIGH-IMPACT POLYSTYRENE

Posted in 2014, CHEMISTRY, Issue June 2014 | 0 comments

In the work of the study of changes in the white shockproof polystyrene from the effects of vacuum ultraviolet light at room and elevated temperatures.

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RESEARCH OF CRYSTALLIZATION PROPERTIES AND GLASS STRUCTURE OF CONSTRUCTION PURPOSE BASED ON PRODUCTION WASTE

Posted in 2020, CHEMISTRY, Issue №2(92) February 2020 | 0 comments

Data on the synthesis of metastable glasses and glass crystalline materials based on the ash and slag of the Angren (CHP), flotation waste fluorite dressing factory (FOF) are summarized in this paper. The author shows the composition and technological parameters.

Such integrated processing of coal waste will not only ensure a significant expansion of the raw material base for the production of building materials and generate additional energy, but also help to solve environmental problems and improve the environmental situation in industrial regions.

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THE METHOD OF OBTAINING OF NANO-CRYSTALLINE POWDERS FOR EXAMPLE OF PbWO4

Posted in 2014, CHEMISTRY, Issue June 2014 | 0 comments

In this paper deals with an advanced method of obtaining ultradisperse powders of insoluble inorganic compounds by titration of the solution of one of the components of metabolic reactions solution of the other.

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THE MICROSTRUCTURE OF NANODISPERSED OF LEAD TUNGSTATE

Posted in 2014, CHEMISTRY, Issue June 2014 | 0 comments

In this paper deals the analysis micrograph nanodispersed lead tungstate obtained in the course of exchange reactions between Na2WO4 2H2O and Pb(CH3COO)2 times 3H2O.

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DEVELOPMENT OF A SYSTEM PASSIVATION STEELS, USED FOR NUCLEAR POWER PLANT EQUIPMENT

Posted in 2014, CHEMISTRY, Issue June 2014 | 0 comments

In this paper consider a method of increasing the efficiency of anti-corrosive treatment of nuclear power equipment by passivation of aluminum solutions.

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THE METHOD OF OBTAINING OF SODIUM BOROSILICATE FROM WATER SOLUTIONS OF BORIC ACID AND POTASSIUM METHYL SILICONATE

Posted in 2014, CHEMISTRY, Issue June 2014 | 0 comments

In this paper describes an improved method to retrieve a sodium borosilicate from water solutions of boric acid and potassium methyl siliconate.

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CHANGES IN THE STRUCTURAL STATE OF BOROSILICATE COVERAGE AT HEATING

Posted in 2014, CHEMISTRY, Issue June 2014 | 0 comments

This paper presents research of x-ray phase analysis borosilicate coverage when heated to a temperature of 500 °С.

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THE STRUCTURE OF THE SURFACE OF MODIFIED TITANIUM HYDRIDE

Posted in 2014, CHEMISTRY, Issue June 2014 | 0 comments

This paper presents the analysis of the structure of the surface of modified and unmodified titanium hydride.

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RADIATION-PROTECTION COMPOSITION MATERIALS ON BASE GYPSUM PLATES AND WASTE OF CULLET

Posted in 2014, CHEMISTRY, Issue June 2014 | 0 comments

In this paper deals with an new method of obtaining gypsum plates with application the waste of cullet for reception of highly effective radiation-protective building materials is considered.

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TECHNOLOGY OF RECEIVING THE SURFACE-ACTIVE ADDITIVE – THE CARBOXYLATED GAS CONDENSATE FOR THE CEMENT AND CONCRETE COMPOSITIONS

Posted in 2014, CHEMISTRY, Issue May 2014 | 0 comments

The surface-active additive – carboxylic gas condensate by copolymerization of hydrocarbons gas condensate and metacrilic acids in the presence of the initiator of polymerisation – peroxides of di-tretbutiles is received. It is shown that the received modifying additive with low acid number can be used for regulation of physicomechanical properties of cement-concrete compositions, in particular, for increase of durability of concrete or the granulated filler of concrete.

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PHASE FORMATION IN MECHANOCHEMICAL SYNTHESIS OF EUROPIUM AND LANTHANUM HAFNATES: AB INITIO MODELING AND EXPERIMENTAL STUDY

Posted in 2020, CHEMISTRY, Issue № 01(91) January 2020 | 0 comments

The phase diagrams for La-Hf-O and Eu-Hf-O systems at 0K were constructed with the help of the first-principle modeling method. One of the main differences between these systems is the existence of a nonequilibrium La2HfO5 phase in the La-Hf-O system. Equimolar mixtures of La2O3 + HfO2 и Eu2O3 + HfO2 oxides were subjected to mechanochemical treatment for 45 min. The structure and phase composition of the products of mechanosynthesis were investigated. The authors formulated mechanisms of phase transformations during the mechanochemical treatment La2O3 + HfO2 и Eu2O3 + HfO2 mixtures. The formation of the non-equilibrium La2HfO5 phase during mechanochemical treatment and a significantly higher degree of conversion of the starting reagents to the stable La2Hf2O7 phase were detected for the Eu2O3 + HfO2 mixture, while the Eu2O3 + HfO2 mixture was characterized by selective amorphization of europium oxide, structural transformations of hafnium oxide from monoclinic orthorhombic, and relatively low conversion to the Eu2Hf2O7 phase.

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PATTERN FORMATION ON SURFACE OF HIGH-DENSITY POLYETHYLENE

Posted in 2019, CHEMISTRY, Issue № 12(90) December 2019 | 0 comments

The authors obtained nanocomposite materials in the form of a flexible polymer substrate with a hard coating as a result of plasma treatment of high-density polyethylene (HDPE) films and metal (gold) deposition on the surface of HDPE films. Fragmentation of the hard coating takes place with the formation of a unique ordered relief on the polymer surface during deformation of the obtained materials. Using scanning electron microscopy, the parameters of the obtained relief are determined depending on the drawing conditions and subsequent shrinkage of the deformed nanocomposites. The proposed approach may be applied as a method of modifying the surface properties of polymers.

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METHODOLOGICAL FEATURES OF DETERMINATION OF DIPYRIDYL SALTS IN AGRICULTURE AND PLANT PRODUCTS

Posted in 2019, CHEMISTRY, Issue № 12(90) December 2019 | 0 comments

The paper presents methodological features of methods for determining the residual amounts of dipyridyl salts (on the example of dibromide diquat) in potatoes, peas, rapeseeds, soybeans and vegetable oils using ion-pair high-performance liquid chromatography (HPLC) with an ultraviolet detector after extracting a substance from an analyzed sample with diluted sulfuric acid upon boiling, purification of the extract, and concentration of the substance by ion-exchange chromatography on a column with Dowex 50Wx8 cation exchange resin, as well as additional purification on pat solid-phase C18 Sep Pak extraction. The authors reached the lower limits for the quantitative determination of diquat in potato tubers — 0.025 mg/kg, soybean, rape, sunflower, pea — 0.05 mg/kg, vegetable oils — 0.05 mg/kg.

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