Chemical Problems最新文献

{"title":"THERMOMECHANICAL PROPERTIES OF COMPOSITE MATERIALS BASED ON MIXTURES OF HIGH AND LOW DENSITY POLYETHYLENES","authors":"F. Mustafayeva, N. T. Kahramanov","doi":"10.32737/2221-8688-2023-1-41-47","DOIUrl":"https://doi.org/10.32737/2221-8688-2023-1-41-47","url":null,"abstract":"The results of the research into the influence of polymer components ratio - high density polyethylene and low density polyethylene, into the regularity of changes in thermomechanical properties are presented. The deformation was measured at varying temperatures and at a constant load of 0.5 kg/cm2 . The concentration of low density polyethylene varied from 10 to 100 wt%. Depending upon the test temperature, two physical states were recorded: solid and viscous-flow. It found that as the concentration of low-density polyethylene in the composition of the polymer mixture rose, the transition temperature in the softened state and the transition temperature in the viscous-flow state dropped. The differential thermal analysis curves showed that at low concentrations of high density polyethylene, two-phase systems were formed in the polymer system. The study of composites based on aluminum hydroxide and a mixture of high and low density polyethylene revealed a wave-like change in softening and viscous-flow temperatures.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72699738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"POWDER X-RAY DIFFRACTION STUDY OF THE Cu3SbS3-CuI SYSTEM","authors":"P. R. Mammadli, D. Babanly","doi":"10.32737/2221-8688-2023-1-57-63","DOIUrl":"https://doi.org/10.32737/2221-8688-2023-1-57-63","url":null,"abstract":"The nature of phase equilibria in the Cu3SbS3-CuI binary system over the entire concentration range were studied by means of the powder X-ray diffraction analysis (PXRD) for the first time at room temperature. It was found that the sample containing 66.7 mol.% CuI composed of a single phase and has a powder diffraction pattern completely different from the constituent phases of the system under study. The crystal lattice type and parameters, that were determined on the basis of the X-ray diffraction pattern of this sample using the TOPAS 4.2 and EVA computer programs are fully consistent with the literature data of the Cu5SbS3I2 four-component compound. The copper (I) iodide rich samples of the system consist of a two-phase mixture of Cu5SbS3I2 and CuI phases. However, the system is unstable in the Cu5SbS3I2-Cu3SbS3 composition range. In this concentration interval, the system is characterized by complex physico-chemical interaction of the initial components.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88492214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"STUDY OF PROCESSE OF OBTAINING MONOPOTASSIUM PHOSPHATE BASED ON MONOSODIUM PHOSPHATE AND POTASSIUM CHLORIDE","authors":"M.A. Shaymardanova, K. Mirzakulov, G. Melikulova, S.Z. Khodjamkulov, A. Nomozov, Kh.S. Shaymardanova","doi":"10.32737/2221-8688-2023-3-279-293","DOIUrl":"https://doi.org/10.32737/2221-8688-2023-3-279-293","url":null,"abstract":"Results of studies of the process of conversion of the flotation potassium chloride of the Tyubegatan deposit with solutions of sodium dihydrogen phosphate obtained on the basis of purified extraction phosphoric acid from phosphorites of the Central Kyzylkum to potassium dihydrogen phosphate are presented. The effect of the ratio of the components, S:L on the formation of potassium dihydrogen phosphate at temperatures of 25°C and 100°C was studied. Optimal technological parameters for isolation of potassium dihydrogen phosphate were determined. Rheological properties of solutions formed in the process of obtaining potassium dihydrogen phosphate were identified. The obtained results were confirmed by X-ray phase and IR-spectroscopic methods of analysis. Elemental composition of potassium dihydrogen phosphate was established by electron microscopy.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80407922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SYNTHESIS OF NEW THERMOSTABLE POLYHYDROXYESTER ON THE BASIS OF 2- HYDROXYPROPYL-1,3-BIS-CARBOXYMETHYLESTEROSULFOIMIDE OF SACCHARIN-6-CARBOXYLIC ACID","authors":"E. T. Aslanova, E.T. Mamedov, M. Rashidova, A. Garayeva, V.O. Atakishiyeva","doi":"10.32737/2221-8688-2023-2-140-145","DOIUrl":"https://doi.org/10.32737/2221-8688-2023-2-140-145","url":null,"abstract":"By polycondensation of 2-hydroxypropyl-1,3-bis-carboxymethylesterosulfoimide of saccharin-6- carboxylic acid with ethylene glycol, a thermostable polyhydroxyester was obtained. The structure of the synthesized compound was confirmed by data of the infrared spectroscopy and the thermal stability studied by a method of differential-thermal analysis on a derivatograph of “Paulik—Paulik Erdei” system. The derivatographic investigations showed that the synthesized polyhydroxyester had high thermal stability and physical-mechanical properties.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75976039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"USE OF GLYCIDYLOXYMETHYL SUBSTITUTED PHENYL (BENZYL) CYCLOPROPANES IN THE COMPOSITION OF EPOXIDE OLIGOMER ED-20 AS DILUENTS","authors":"E. Ahmadov, P.M. Shirinov, R. Shahnazarli, G. Ramazanov","doi":"10.32737/2221-8688-2023-3-262-268","DOIUrl":"https://doi.org/10.32737/2221-8688-2023-3-262-268","url":null,"abstract":"By the interaction of phenyl (benzyl) substituted cyclopropylcarbinols with epichlorohydrin, the glycidyloxymethyl substituted phenyl(benzyl)cyclopropanes, used as active diluents of epoxide resin ED-20, were synthesized. It found that the addition of the obtained epoxy compounds to the epoxide resin decreases the viscosity of the resin and increases the lifetime of the compositions. The high degree of curing (96-98%) indicates the participation of the synthesized epoxycyclopropanes in the cross-linking processes. Some physical-mechanical characteristics of compounds made with the participation of the synthesized epoxycyclopropanes were established. The improvement of strength and heat-physical parameters of cured compositions in comparison with compositions made without diluents was revealed.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76337614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SYNTHESIS OF COMPLEXES OF Cu(II) AND VO(IV) WITH HYDRAZIDE OF MALEIC AND HYDRAZINEDIACETIC ACID","authors":"E. Guliyeva, P. A. Fatullayeva, F. F. Jalaladdinov, T.Ya. Askerova, T.M. Akhverdiyeva, M. Mammedova, R. D. Kasumov, M. Bayramov","doi":"10.32737/2221-8688-2023-3-269-278","DOIUrl":"https://doi.org/10.32737/2221-8688-2023-3-269-278","url":null,"abstract":"The work demonstrated that hydrazide of maleic and hydrazine diacetic acid(L-2,2'-(2-(3- carboxyacryloyl)hydrazine-1,1-diil)diacetic acid) forms mononuclear complexes [CuL(H2O)2] and [VОL(H2O)2]. The structure and physical properties of these complex compounds have been studied by IR, UV spectroscopy and thermogravimetric methods of analysis. On the basis of the data obtained, the structure of the complexes was proposed, in which the metal ion is coordinated by two oxygen atoms and one nitrogen atom of the aminodiacetic fragment. In the electronic spectra of the copper complex, there are absorption bands of the transition at ~240 nm (related to charge transfer) and one d-d transition 740 nm. In the electronic spectra of the vanadyl complex, several absorption bands are observed at 300 nm (inflection), ~625 nm (inflection), and 780 nm, which can be attributed to d–d transitions of the VO2+in the low symmetry ligand environment. The five-coordinated structure of the complex is carried out by two oxygen atoms of two water molecules. The EPR spectrum of the polycrystalline [CuL(H2O)2] complex at room temperature indicates a low symmetry of the complex and has three g -factor values: g1=2.30, g2=2.22; g3=2.11. Additionally, a hyperfine structure is observed due to 63.64Cu nuclei (nuclear spin 3/2) with a splitting constant of 80 G.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77342316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SYNTHESIS OF CARBOXYLATE TYPE SORBENT BASED ON COOLIGOMERS OF 2-PROPENYLPHENOL AND FORMALDEHYDE AND STUDY OF THEIR FUNCTIONAL PROPERTIES FOR SORPTION OF URANYL IONS IN MODEL SYSTEMS","authors":"M. Bayramov, A. Maharramov, G. M. Mehdiyeva, Sh.J. Guliyeva, M.A. Aghayeva","doi":"10.32737/2221-8688-2023-1-85-92","DOIUrl":"https://doi.org/10.32737/2221-8688-2023-1-85-92","url":null,"abstract":"Alkaline synthesis of double co-oligomers of 2-propenylphenol and formaldehyde (synthons) was carried out at 92-950C, for 3 hours and ratio of 1:2.5 mol (their yield are 93% of theory)Interaction of maleic anhydride with the obtained olygomers at 800C in the presence of 0.5% benzoyl peroxide for 10 hours produced copolymers of a three-dimensional cross-linked structure (with a yield of 90%). By treating them with hot water, a sorbent was obtained to contain both propenyl and carboxylate fragments in the structure - active centers of chemisorption. The functional sorption properties of the copolymer were studied under static conditions, in model water systems. The influence of the pH of the medium, the concentration of uranyl ions and the exposure time on the degree of their sorption at room temperature were studied and it was found that the best results are achieved at pH 6 and for 24 hours (R=93%). Uranyl ions can be easily desorbed with mineral acid and the crosslinked copolymers can be reused.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87817830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RADIOLYTIC PROCESSES IN MIXTURE OF WATER WITH CARBON DIOXIDE IN THE PRESENCE OF ORGANIC MATRIX","authors":"K. Mammadov, U. Aliyeva-Jabbarly, H. Shiraliyeva","doi":"10.32737/2221-8688-2022-3-347-357","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-3-347-357","url":null,"abstract":"The radiolysis of purified water, its mixture with carbon dioxide, and also with the addition of salt of potassium chloride isotope (40KCl) and plant mass to this system were carried out in order to study the mechanism of radiolytic processes taking place in the plant mass in the presence of the natural potassium isotope (40K) contained in it. It revealed that in the presence of 40KCl in the system, the formation of trace amounts of molecular hydrogen is observed (in accord with an insignificant dose of radiation from 40K). A decrease in the rate of formation of molecular hydrogen with an increase in the concentration of CO2 is observed during the radiolysis of a two-component system (H2O - CO2). An increase in the rate of formation of molecular hydrogen, carbon monoxide, methane and relatively heavy hydrocarbons (C6, C7, C8) accompanied by an increase in the absorbed dose of ionizing radiation (at stable concentrations of all components of the system) is observed when studying the kinetics of the formation of radiolysis products of the multicomponent system \"H2O - CO2 - 40KCl - organic matrix\". There is a tendency to reduce the rate of formation of molecular hydrogen and methane and increase the rate of formation of CO and relatively heavy (C6, C7, C8) hydrocarbons with an increase in CO2 concentration. The rates of formation of all products (H2, CO, CH4, and relatively heavy hydrocarbons) grow with an increase in the amount of organic matter in the mixture (at stable concentrations of CO2, H2O, and 40KCl). İt found that an increase in the mass of the organic matrix in the analyzed multicomponent system stimulates an increase in the formation of all radiolysis products. There is a decrease in the rate of formation of H2 and CH4, a relatively slow increase in the rate of formation of carbon monoxide, and an increase in the rate of elementary reactions of the transformation of light radiolysis products (H2, CO, CH4) into relatively heavy products (C6, C7, C8) together with an increase in CO2 concentration. The results obtained show the expediency of taking into account the contribution of ionizing radiation from radionuclides present in the environmental components, when considering multistage biochemical mechanisms of photosynthesis in order to explain the initiation of energy-intensive processes of CO2 and H2O decomposition","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73681672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NEUTRALIZATION OF PHENOL-CONTAMINATED SOILS","authors":"R. G. Hasanov, G. S. Hasanov, V.K. Valiev","doi":"10.32737/2221-8688-2022-2-154-163","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-2-154-163","url":null,"abstract":"To eliminate the consequences of accidental spill of phenol, the results of neutralization of soils contaminated with phenol are presented. As for the analysis of soils by the geological-lithological section it was found that in areas of phenol contamination the soil has a surface soil-plant layer with a thickness of about 0.5m, then there is a heavy clay layer with a thickness of up to 7.0 m and finally a sand layer saturated with groundwater is observed. It revealed that according to physical and mechanical properties, the solid mineral phase of the soil corresponds to a hard plastic and semi-solid consistency of clays. It showed that the filtration of water through the bottom and walls on the area of the former burial of the tank is complicated because of closer to zero water permeability of soil strata due to clay rock. Mineralogical and chemical composition of soils contaminated with phenol is determined. An environmentally safe method of neutralizing phenol-containing soils is developed with a neutralizing composition based on quicklime and bentonite which simplifies the neutralization method of soils contaminated with phenol. Environmental safety was observed in the absence of phenol in water extracts from soils and the in treatment process permissible for the environment рН. Essence of proposed method lies in chemical inactivation of phenol based on its transformation into slow-moving water-insoluble compound - calcium phenolate. Decontamination product of phenol-containing soil is the smallest capsules comprising soil particles and immobilized phenol in the form of calcium phenolate. Material of the capsule represented by calcium hydroxide is neutralized over time by bentonite and СО2 from air resulting in the formation of hydrophobic silicate and calcium carbonate which gives capsules high strength properties. The research into the neutralized phenol containing soil for phenol in water extracts showed that the proposed method is simple, ecologically safe, causes no recontamination of environment with pollutants and provides the phenol content in soils within MAC.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83321738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SYNTHESIS AND STUDY OF THE STRUCTURE OF Pd AND Mn NANOPARTICLES IN THE PRESENCE OF POLYVINYLPYRROLIDONE","authors":"N. Zeynalov, U. Mammadova, A. Isazade, N.T. Shikhverdiyeva, C. Seidova, H. Aslanova, N. Rahimli, K.J. Hasanova, E.H. Babayev","doi":"10.32737/2221-8688-2022-2-145-153","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-2-145-153","url":null,"abstract":"Poly-N-vinylpyrrolidone is widely used among synthetic polymers due to its non-toxicity and solubility in water and other organic solvents. Complex compounds with metals and non-metals find widespread application in various fields of industry and medicine. The purpose of this study is to synthesize metal-polymer complexes for obtaining a new type of catalyst. Poly-N-vinylpyrrolidone was first dissolved in water and then re-mixed with the addition of the PdCl2 salt. A reducing agent was added to the solution, and finally the resulting substance was established by means of a binder. The same process was typical for MnCl2 salt. Complexes obtained studied by various research methods (FTIR, XRD, SEM, UV-Vis). Proceeding from the results of the research methods, we can say that the construction process was successful and the metal nanoparticles settled on the surface and inside the polymer. The obtained complex compounds are intended to be used as catalysts","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90325254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}