Pages Navigation Menu
Submit scientific paper, scientific publications, International Research Journal | Meždunarodnyj naučno-issledovatel’skij žurnal

CHEMISTRY

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

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.

Read More

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.

Read More

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.

Read More

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.

Read More

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.

Read More

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.

Read More

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.

Read More

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.

Read More

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.

Read More

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.

Read More

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.

Read More

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.

Read More

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.

Read More

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.

Read More

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.

Read More

CHEMICAL MODIFICATION OF AMINOPOLYSACCHARIDE FROM SHRIMP SHELL BY DIRECT GRAFTING WITH POLYANILINE

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

Aminopolysaccharide was modified by deacetylation of chitin from shrimp shell using enzyme as a biocatalyst and microwave energy. Modified aminopolysaccharide has degree of deacetylation of 83 higher than that of using normal chemical method. Aminopolysaccharide was successfully grafted with aniline by free radical mechanism with ammonium persulfate initiator. The reaction was carried out in aqueous medium. The effect of reaction temperature, reaction time, aminopolysaccharide: aniline weight ratio were investigated. The results showed that the best conditions for grafting of aminopolysaccharide were aminopolysaccharide: aniline weight ratio of 1:2, reaction temperature of 5oC and reaction time of 60 minutes. The modified aminopolysaccharide was characterized by Fourier transform infrared spectroscopy and Scanning electron microscopy. Degree of Grafting of modified aminopolysaccharide obtained 41%.

Read More

SYNTHESIS AND CRYSTAL CHARACTERIZATION OF PALLADIUM(II) NITRATE COMPLEXES

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

In the article considered the synthesis and structure of mononuclear cis-diamine complexes of palladium (II), which easly undergoes to process of hydrolysis – [Pd(tmen)(NO3)2] and [Pd(2-ampy)(NO3)2] (where tmen – N,N,N`,N` – tetramethylethylenediamine, 2-ampy – 2-aminomethylpyridine). Data of the X-ray structural analysis also provided. Relative catalytic activity of complexes is considered in reaction of oxidation biothiols.

Read More

ADVANCED POLYMER COMPOSITES FOR FILLERS

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

In this paper we describe the use of polyhedral oligomeric silsesquioxanes for the synthesis of radiation-resistant polymer composites

Read More

HETEROANALOGS OF PROSTAGLANDINENDOPEROXIDE ON THE BASIS OF STEREOISOMER 3,4,5,6-TETRACHLORTRICYCLO[6.2.1.02,7]-UNDEKA-3,5-DIEN-9,10-DICARBOXYLIC ACIDS

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

Heteroanalogs of prostaglandinendoperoxide have been synthesized on the basis of adducts of reaction of 5,5-dimethoxytetrachlorcyclopentadiene with stereoisomer endo- and exo-bicyclo[2.2.1]hept-5-en-2,3-cis-(trans-)acids.

Read More

STABILITY OF THE Pt-Ru CATALYSTS IN SELECTIVE OXIDATION OF METHANE INTO SYNTHESIS-GAS

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

The results of stability studies of optimal particulate developed Pt-Ru = 1: 1 (Pt: Ru = 0,7: 0,3, at.%) Of the catalyst in the reaction SCO (selective catalytic oxidation) and steam-oxygen conversion of methane to synthesis gas at millisecond contact times.

Read More