Chemical Journal of Kazakhstan最新文献_第4页

A STUDY OF THE THEORETICAL FOUNDATIONS FOR OBTAINING A STABLE FORMULATION OF A SUSPENDED FUNGICIDAL COMPOSITION AND ITS EFFECT ON THE YIELD OF COTTON, THE DEGREE OF CO2 RELEASE FROM THE SOIL (Part 2) 悬浮剂稳定配方的理论基础及其对棉花产量、土壤CO2释放度的影响(二)

Chemical Journal of Kazakhstan Pub Date : 2022-12-15 DOI: 10.51580/2022-3/2710-1185.93

N.N. Yesserkeyeva, S. Usmanov, D. E. Fischer, Ye.N. Ramazanova, B. Tolkyn, A.E. Trenova, O. Myachina, B. Zakirov

{"title":"A STUDY OF THE THEORETICAL FOUNDATIONS FOR OBTAINING A STABLE FORMULATION OF A SUSPENDED FUNGICIDAL COMPOSITION AND ITS EFFECT ON THE YIELD OF COTTON, THE DEGREE OF CO2 RELEASE FROM THE SOIL (Part 2)","authors":"N.N. Yesserkeyeva, S. Usmanov, D. E. Fischer, Ye.N. Ramazanova, B. Tolkyn, A.E. Trenova, O. Myachina, B. Zakirov","doi":"10.51580/2022-3/2710-1185.93","DOIUrl":"https://doi.org/10.51580/2022-3/2710-1185.93","url":null,"abstract":"Used seed disinfectants of agricultural crops, and in particular cotton, do not provide plants with additional nutrient nitrogen and obtain a high yield of raw cotton. In this work, the task is to create an active substance and, on its basis, a preparative form of a composition of a multifunctional action, which simultaneously allows reducing diseases of cotton plants, increasing the accumulation of easily hydrolysable nitrogen in the soil and obtaining a high yield of raw cotton. The purpose. Synthesis and study of the theoretical foundations for obtaining the active substance and the formulation of the composition for dressing cotton seeds based on methylol ureas and molybdenum phytocompounds. Results. The mechanism of influence medium of pH, temperature and storage time on the stability of the preparative form, which ensures high biological efficiency, is substantiated. The mechanism of the influence of the preparative form of a double compound based on monomethylol urea and molybdenum phytocompound on the yield of cotton and the greenhouse effect has been established. It was revealed that during the growing season the composition provides the accumulation in the soil of an additional content of easily hydrolysable nitrogen and mobile forms of phosphorus pentoxide, reduces the release of carbon dioxide into the gas phase and increases the yield of raw cotton. Conclusion. The optimal storage parameters of the composition were determined to ensure high biological efficiency: pH 6.5-7.5, temperature 20 °C and 35 °C, and storage time 3-6 months. A decrease in the release of carbon dioxide in the soil by 22 - 32 mg / m2 per hour and an increase in the yield of cotton by 20.58 % - 37.51 % were established.","PeriodicalId":9856,"journal":{"name":"Chemical Journal of Kazakhstan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77879711","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}

引用次数: 0

STUDY OF THERMAL DECOMPOSITION OF THE COPOLYMER BASED ON POLYETHYLENE GLYCOL FUMARATE WITH METHACRYLIC ACID 富马酸聚乙二醇与甲基丙烯酸共聚物的热分解研究

Chemical Journal of Kazakhstan Pub Date : 2022-12-15 DOI: 10.51580/2022-3/2710-1185.99

S. Davrenbekov, U.B. Toleuov, A. N. Bolatbai, D. Havlícek, T. Khamitova, E.J. Zhakupbekova

{"title":"STUDY OF THERMAL DECOMPOSITION OF THE COPOLYMER BASED ON POLYETHYLENE GLYCOL FUMARATE WITH METHACRYLIC ACID","authors":"S. Davrenbekov, U.B. Toleuov, A. N. Bolatbai, D. Havlícek, T. Khamitova, E.J. Zhakupbekova","doi":"10.51580/2022-3/2710-1185.99","DOIUrl":"https://doi.org/10.51580/2022-3/2710-1185.99","url":null,"abstract":"Thermal performance of copolymer based on polyethylene glycol fumarate and methacrylic acid in a dynamic mode, in an inert nitrogen environment are considered in the present work. Kinetic evaluation of thermal decomposition process was conducted using three different data processing methods (Friedman, Ozawa-Flynn-Wall, Kissinger-Akahira-Sunose). Utilizing a mixed-method approach kinetic triplets Eа, A, g(a) were received. The received kinetic parameters were used to calculate the thermodynamic characteristics of Gibbs energy (∆G), enthalpy (∆H) and entropy of activation (∆S). Copolymer thermal gravimetric analysis (TGA) and differential thermogravimetric analysis (DTA) curves were studied under nitrogen environment using a heating rate of 2,5, 5, 10 or 20°C/min. The method of Invariant Kinetic Parameters was used to identify the reaction model and pre-exponential factor. The main phase of copolymer decomposition was set, which occurred within a narrow temperature interval and is evidenced by the spike on the differential curve. Values for 13 reaction models were received. Utilised methods resulted in a proper energy activation alignment within 223-229 kJ mol-1. Design and experimental data provided close values. TGA and DTA curve analysis has shown a sufficient thermal stability of these copolymers under the nitrogen environment.","PeriodicalId":9856,"journal":{"name":"Chemical Journal of Kazakhstan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86479424","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}

引用次数: 0

INVESTIGATING COMPUTATIONALLY THE FORMATION MECHANISM OF METHYLTRIPHENYLPHOSPHONIUM BROMIDE AND ETHYLENE GLYCOL BASED NATURAL DEEP EUTECTIC SOLVENT AND ITS APPLICATIONS IN THE PURIFICATION OF BIOFUEL 计算研究了甲基三苯基溴化磷与乙二醇天然深共晶溶剂的形成机理及其在生物燃料提纯中的应用

Chemical Journal of Kazakhstan Pub Date : 2022-12-15 DOI: 10.51580/2022-3/2710-1185.97

Zh. A. Sailau, N.Zh. Almas, K. Toshtai, A. Aldongarov, Y. Aubakirov

{"title":"INVESTIGATING COMPUTATIONALLY THE FORMATION MECHANISM OF METHYLTRIPHENYLPHOSPHONIUM BROMIDE AND ETHYLENE GLYCOL BASED NATURAL DEEP EUTECTIC SOLVENT AND ITS APPLICATIONS IN THE PURIFICATION OF BIOFUEL","authors":"Zh. A. Sailau, N.Zh. Almas, K. Toshtai, A. Aldongarov, Y. Aubakirov","doi":"10.51580/2022-3/2710-1185.97","DOIUrl":"https://doi.org/10.51580/2022-3/2710-1185.97","url":null,"abstract":"Biodiesel is a new replacement for various types of traditional fuels. There are many advantages of biofuel including renewable, less-flammability, and cheaper compared to traditional fuel, reduce greenhouse gas emissions, and others. However, the primary challenge of biofuel production in the large-scale production is related to purification of its unwanted impurities such as glycerol, water, methanol, soap/catalyst, free fatty acids, glycerides and others. Herein, glycerol is an unwanted impurity of biofuel that leads to problems including i) deposition in the bottom of fuel tank, ii) decantation, iii) engine durability problems, iv) setting problems, v) injector fouling, vi) storage problem, and others. Consequently, there are many ways to remove glycerol, and herein, the one alternative is extraction of glycerol from biodiesel via Natural Deep Eutectic Solvents. In this regard, the mixture of a methyltriphenylphosphonium bromide and ethylene glycol, as a Natural Deep Eutectic Solvent ais effective in removing glycerol from biofuel. In this work, we had investigated the formation mechanism of methyltriphenylphosphonium bromide and ethylene glycol, as a Natural Deep Eutectic Solvents, and then extraction of glycerol from biofuel via Natural Deep Eutectic Solvents via implementing Quantum Chemical Calculations using HyperChem software. The results imply that there are strong ionic and covalent interactions between bromine, methyltriphenylphosphonium and ethylene glycol according to optimized structures, bond length, energies, and others. Secondly, the extraction of glycerol from biofuel is mainly achieved via bromine ion of Natural Deep Eutectic Solvent, and the structure of Natural Deep Eutectic Solvent is remaining unchanged after this process, meaning its stability, and can be reused.","PeriodicalId":9856,"journal":{"name":"Chemical Journal of Kazakhstan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91100577","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}

引用次数: 0

THE METAL IONS CONCENTRATION DETERMINING IN THE SOLUTIONS USING VOLTAMMETRIC ANALYZER 用伏安分析仪测定溶液中金属离子浓度

Chemical Journal of Kazakhstan Pub Date : 2022-12-15 DOI: 10.51580/2022-3/2710-1185.96

B. Begenova, K. Khakimbolatova, N.V. Ostafeychuk

{"title":"THE METAL IONS CONCENTRATION DETERMINING IN THE SOLUTIONS USING VOLTAMMETRIC ANALYZER","authors":"B. Begenova, K. Khakimbolatova, N.V. Ostafeychuk","doi":"10.51580/2022-3/2710-1185.96","DOIUrl":"https://doi.org/10.51580/2022-3/2710-1185.96","url":null,"abstract":"Ion exchange materials are successfully used for solution of a number of practical problems, such as production processes waste-free technology creation, industrial wastewater treatment, rational natural resources and environmental protection use. The Physicochemical and sorption characteristics study is needed for the determination of ion exchangers application promising areas, however chemical research methods are laborious, and atomic absorption spectroscopy is not always available. The purpose of this work is to find and use available methods, which do not require complex technological equipment for metal ions concentration determining in the solutions. Methodology. Stripping voltammetric determination of metal ions by addition method has been used to determine the equilibrium concentrations of metal ions in the solutions. Results and discussion. The non-ferrous metal ions concentration determining methods have been developed and used on the voltammetric analyzer «Ecotest BA», which is a real economical alternative to expensive methods of analysis. Stripping voltammograms of samples, which contain cadmium and copper, zinc, lead cations; vanadate ion, molybdate ion were constructed. The ions concentrations in the equilibrium solutions after sorption are calculated. Conclusion. The stripping voltammetric method is convenient for studying the sorption and ion-exchange materials complexing properties; it and also allows to determine several metals without their preliminary separation resorting.","PeriodicalId":9856,"journal":{"name":"Chemical Journal of Kazakhstan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90479845","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}

引用次数: 0

STUDY OF THE INFLUENCE OF MODIFIERS ON THE PROCESSES OF WETTING MINERAL FILLERS AND HYDROPHOBICITY OF BITUMEN FILMS 改性剂对润湿矿物填料过程及沥青膜疏水性影响的研究

Chemical Journal of Kazakhstan Pub Date : 2022-09-15 DOI: 10.51580/2022-3/2710-1185.77

A. Dyuryagina, YU.S. Byzova, N. Salikova, K. Ostrovnoy, T. A. Gorshkova, P.O. Savelyeva

{"title":"STUDY OF THE INFLUENCE OF MODIFIERS ON THE PROCESSES OF WETTING MINERAL FILLERS AND HYDROPHOBICITY OF BITUMEN FILMS","authors":"A. Dyuryagina, YU.S. Byzova, N. Salikova, K. Ostrovnoy, T. A. Gorshkova, P.O. Savelyeva","doi":"10.51580/2022-3/2710-1185.77","DOIUrl":"https://doi.org/10.51580/2022-3/2710-1185.77","url":null,"abstract":"As you know, the quality of asphalt pavement often does not meet the stated standards. The low degree of adhesion between bitumen and mineral material is primarily due to the insufficient ability of bitumen to effectively wet the surface of crushed stone, especially of an acidic nature. The aim of the work is to establish the influence of various modifiers on the wetting processes of bitumen compositions. The methods of the work included the study of the wetting processes of mineral fillers of various nature depending on the quantitative polymer content in bitumen, as well as the study of the regularities of the effect of modifiers on the hydrophobicity of bitumen films. The wetting angle θof the surface was experimentally determined by the lying drop method. Results and discussion: as follows from the analysis of the data obtained, the introduction of AG-4I most effectively contributes to the reduction of the surface tension σlgat the interface of the phases \"bitumen composition –gray crushed stone\". This is evidenced by the maximum wetting ability of the composition. Conclusion: it was found that of the two polymer modifiers, the spent sealing liquid AG-4I has the maximum effect on the wetting processes of mineral fillers and the hydrophobicity of bitumen films. A narrow range of modifier concentrations (Cmodif= 0.5%) was revealed, at which the water-repellent properties of bitumen compositions are enhanced. A hydrophobic effect comparable to AG-4I provides the introduction of 0.25% calcium chloride into the bitumen composition.","PeriodicalId":9856,"journal":{"name":"Chemical Journal of Kazakhstan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75309519","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}

引用次数: 0

SYNTHESIS AND GROWTH-STIMULATING ACTIVITY OF TRIMECAINE ETHYL IODOETHANOATE 碘乙酸乙酯三美卡因的合成及促生长活性研究

Chemical Journal of Kazakhstan Pub Date : 2022-09-15 DOI: 10.51580/2022-3/2710-1185.82

A. Dauletbakov, Y. Belyankova, S. Tursynbek, B. Anapiyayev, D. Zolotareva, A. Ten, A. Zazybin

{"title":"SYNTHESIS AND GROWTH-STIMULATING ACTIVITY OF TRIMECAINE ETHYL IODOETHANOATE","authors":"A. Dauletbakov, Y. Belyankova, S. Tursynbek, B. Anapiyayev, D. Zolotareva, A. Ten, A. Zazybin","doi":"10.51580/2022-3/2710-1185.82","DOIUrl":"https://doi.org/10.51580/2022-3/2710-1185.82","url":null,"abstract":"Novel activation methods such as ultrasonic activation and microwave irradiation are becoming increasingly popular in the green synthesis of ionic liquids and ionic compounds. The use of ionic liquids and ionic compounds is becoming more and more interesting for scientists precisely because of their growth-stimulating activity.The purpose.Synthesisof trimecaine ethyl iodoethanoatewascarried out via N-alkylation in classical conditions and using ultrasonicirradiation and microwave-assisted synthesis. Methodology.Thestructure and functional groups of novel synthesized substanceidentifiedby1H,13C NMRandIR,and growth-stimulating activity tested fortengenotypes of sweet sorghum seeds.Thesynthesis of trimecaine ethyliodoethanoate was carried out via N-alkylation in classical conditions and using microwave radiation and ultrasonic activation. Results.The synthesized ionic compoundswere characterized by IR, 1H and 13C NMR, growth-stimulating activity was tested on ten varieties and hybrids of sweet sorghum seeds. Alternative methods for the synthesis of ultrasonic and MW activation showed a good result in the synthesis of N,N-diethyl-N-ethylethanoate-N-(2-(mesitylamino)-2-oxoethyl)aminium iodide with a higher isolation yield in a shorter time compared to classical conditions. Conclusion.The product with the highest yield is formed under MW irradiation in a short time, while under classical conditions the yield was lower, and the reaction time was longer. The synthesized ionic compound had a better effect on the energy and germination of all types of sweet sorghum seeds compared to the control.","PeriodicalId":9856,"journal":{"name":"Chemical Journal of Kazakhstan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90653814","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}

引用次数: 1

SYNTHESIS, CHEMICAL MODIFICATION AND GROWTH-STIMULATING ACTIVITY OF N-BENZYLMETHYLAMINE AND INDOLINE DERIVATIVES n -苄基甲胺及吲哚衍生物的合成、化学改性及促生长活性研究

Chemical Journal of Kazakhstan Pub Date : 2022-09-15 DOI: 10.51580/2022-3/2710-1185.81

I. Anuarbekova, D. Markina, E. S. Sycheva, M. Mukanova, G. Sarsenbaeva, O. Seilkhanov

{"title":"SYNTHESIS, CHEMICAL MODIFICATION AND GROWTH-STIMULATING ACTIVITY OF N-BENZYLMETHYLAMINE AND INDOLINE DERIVATIVES","authors":"I. Anuarbekova, D. Markina, E. S. Sycheva, M. Mukanova, G. Sarsenbaeva, O. Seilkhanov","doi":"10.51580/2022-3/2710-1185.81","DOIUrl":"https://doi.org/10.51580/2022-3/2710-1185.81","url":null,"abstract":"One of the main tasks of organic chemistry is development of purposeful synthesis ways of biologically active substances. The chemistry of dithiocarbamic compounds opens up wide possibilities for solving this problem. There is a strong interest in dithiocarbamic acids due to a wide range oftheir biological activity (anticancer, antibacterial, antifungal, anti-neurodegenerative, anti-tuberculosis, growthstimulating, root forming, etc.). The purpose of this studyis the synthesis of biologically active substances inthe series of element(N-,O-,S-,F-,Cl-)organic compounds based on N-benzylmethylamine and indoline, their structure determination and biological activity investigation. Results and discussion. The initial sodium dithiocarbamates were synthesized by the reaction of N-benzylmethylamine and indoline with carbon disulfide in the yields 92 and 52%. Acylation of synthesized dithiocarbamates with acid chlorides was carried out and the corresponding derivatives of dithiocarbamic aromatic and heterocyclic thioanhydrides were obtained in the yields 58-85%. The structure of the synthesized compounds was identified by using elemental analysis, IR spectra, 1Н and 13С NMR spectroscopy. Laboratory study of growth-stimulating activity of new biologically active compounds onlaboratory germination and germination energy of wheat and soybean seeds was carried out.Conclusion.The best results were achieved when wheat seeds were treated with sodium indoline-1-carbodithioate and benzyl(methyl)carbamothio-4-fluorobenzoic thioanhydride at 0.001% concentration.Germination energy and laboratory seed germination were 100% and 100%, and for the standard -80% and 90%, respectively. It was found that seed treatment with new synthesized preparations intensively stimulates the growing and germination of wheat shoots in comparison with the control and the standard.","PeriodicalId":9856,"journal":{"name":"Chemical Journal of Kazakhstan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83232348","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}

引用次数: 0

DETERMINATION OF THE AREA OF CRYSTALLIZATION OF A NEW DOUBLE COMPOUND IN THE SYSTEM MONOMETHYLOL UREA-MOLYBDENUM PHYTO COMPOUND-WATER 单甲基脲钼植物化合物-水体系中新双化合物结晶面积的测定

Chemical Journal of Kazakhstan Pub Date : 2022-09-15 DOI: 10.51580/2022-3/2710-1185.85

E. Ramazanova, S. Usmanov, D. Fischer, T. Balgyn, N.N. Yeserkeeva

{"title":"DETERMINATION OF THE AREA OF CRYSTALLIZATION OF A NEW DOUBLE COMPOUND IN THE SYSTEM MONOMETHYLOL UREA-MOLYBDENUM PHYTO COMPOUND-WATER","authors":"E. Ramazanova, S. Usmanov, D. Fischer, T. Balgyn, N.N. Yeserkeeva","doi":"10.51580/2022-3/2710-1185.85","DOIUrl":"https://doi.org/10.51580/2022-3/2710-1185.85","url":null,"abstract":"The used seed protectants of agricultural crops, and in particular cotton, with a shortage of nitrogen fertilizers, do not provide plants with additional nitrogen in the required volume. In this article, the task is set to create an active and on its basis a perparativeform of a composition of multifunctional action, which allows simultaneously reducing diseases of cotton plants, increasing the accumulation of easily hydrolyzable nitrogen in the soil and obtaining a high yield of raw cotton.The purpose. Study of chemical interaction in a three-component water-salt system monomethylolourea (MMM) -molybdenum phytocomposition (FSMo) -water by visual-polythermal and isothermal methods. Objects. MMM, FSMo, double compound MMM•FSMo-active substance Results.The binary systems MMM–water and FSMo–water, which are part of the system under study, were studied from the complete freezing of thesystem -3.4÷45.4oC (MMM) and -1.3÷43.2oC (FSMo). The triple MMM–FSMo–water system was investigated at temperatures from -11.0 ÷40.0 oC, by six internal sections; of these, I-IV were carried out from the MMM–water side to the top of the molybdenum phytocomposition, and V-VI from the FSMo –water side to the top of the MMMformed in the temperature range -6.9÷35.2oC at a content of 3.7-38.3% MMM and 5.1-6.5% FSMo. Conclusion.Thus, by visual-polythermal and isothermal methods of physico-chemical analysis, the region of crystallization of a new double compound –an active substance based on monomethylolourea and a phyto-compound of molybdenum at a molar ratio of 1:1 has been established.","PeriodicalId":9856,"journal":{"name":"Chemical Journal of Kazakhstan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82382254","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}

引用次数: 0

STUDY OF RADICAL COPOLYMERIZATION REACTION OF UNSATURATED POLYESTERS WITH ACRYLIC ACID 不饱和聚酯与丙烯酸自由基共聚反应的研究

Chemical Journal of Kazakhstan Pub Date : 2022-09-15 DOI: 10.51580/2022-3/2710-1185.86

A. Kovaleva, G. Burkeyeva, Y. Tazhbayev, D. Muslimova

{"title":"STUDY OF RADICAL COPOLYMERIZATION REACTION OF UNSATURATED POLYESTERS WITH ACRYLIC ACID","authors":"A. Kovaleva, G. Burkeyeva, Y. Tazhbayev, D. Muslimova","doi":"10.51580/2022-3/2710-1185.86","DOIUrl":"https://doi.org/10.51580/2022-3/2710-1185.86","url":null,"abstract":"One of the promising and inexpensive types of raw materials, taking into account the use of modern technologies for the production of sealing and adhesive materials, are unsaturated polyesters of various compositions.The aimof this work is to study the reaction of radical copolymerization of polyethylene(propylene)-glycolfumarate with acrylic acid in a dioxane solution at various molar ratios of the initial polymer-monomer mixture. Methodology.The composition of the copolymers was identifiedby HPLC spectroscopy by analyzing the mother liquors, the structure was confirmed by IR spectroscopy. The copolymerization kinetics was studied by the dilatometric method. The degree of swelling of the copolymers was determined by the gravimetric method, and their degree of unsaturation, by the bromid-bromate method. Radical copolymerization constants calculated by the Mayo-Lewis integral method.The results obtainedindicate thatfor any composition of the initial polymer-monomer mixture, the composition of the copolymer is enriched with acrylic acid links, and with an increase in its content in the initial polymer-monomer mixture, the reaction rate increases significantly.An increase in the content of unsaturated polyester in the initial polymer-monomer mixture leads to a decrease in the ability of the copolymer to absorb moisture, which makes it possible to assume their use as bases in the production of sealing and adhesive materials. Conclusion. An analysis of the numerical values of the copolymerization constants showed a higher activity of acrylic acid in comparison with unsaturated polyesters, thereby confirming the previously put forward assumption aboutthe relatively lower reactive ability of the latter.","PeriodicalId":9856,"journal":{"name":"Chemical Journal of Kazakhstan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90099521","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}

引用次数: 0

APPLICATION OF MODIFIED CONDUCTIVE ADDITIVES AND AQUEOUS BINDERS IN POSITIVE ELECTRODES BASED ON LITHIUM IRON PHOSPHATE FOR LITHIUM ION BATTERIES 改性导电添加剂及水性粘合剂在锂离子电池磷酸铁锂正极中的应用

Chemical Journal of Kazakhstan Pub Date : 2022-09-15 DOI: 10.51580/2022-3/2710-1185.87

A.B. Abdrakhmanova, B.T. Kuderina, N. Omarova, A. Sabitova

{"title":"APPLICATION OF MODIFIED CONDUCTIVE ADDITIVES AND AQUEOUS BINDERS IN POSITIVE ELECTRODES BASED ON LITHIUM IRON PHOSPHATE FOR LITHIUM ION BATTERIES","authors":"A.B. Abdrakhmanova, B.T. Kuderina, N. Omarova, A. Sabitova","doi":"10.51580/2022-3/2710-1185.87","DOIUrl":"https://doi.org/10.51580/2022-3/2710-1185.87","url":null,"abstract":"Positive electrodes play a significant role in operation of lithium-ion batteries. The inactive constituents of the electrode coating, electrically conductive additive and binder, are key components for efficient operation of active material.Therefore, minimizing the toxicity of some and the synthesis or modification of others remain an urgent topic for increasing the energy intensity of lithium-ion batteries, which is the main goal of this work. The purpose: Synthesis and modification of nanostructured carbon electrically conductive additives and the study of their influence on the specific characteristics of the electrode in combination with water-soluble polymers. Results.During the research, the optimal compositions of the positive electrode were found: 1) using aqueous polymers, 2) with the addition of synthesized graphene oxide obtained by the Hummers method; 3) with the addition of modified carbon nanotubes obtained by the Hummers method. Conclusion. Graphene oxide synthesized by the Hummers method and carbon nanotubes reduced by the same method give a discharge specific capacity of more than 150 mAh/g and 140 mAh/g, respectively, with an active material theoretical capacity of 160-170 mAh/g, those using them instead of commercial conductive additives can significantly improve the specific characteristics of positive electrodes. This is due to an increase in the kinetics of lithium ion transfer inside the active material due to many structural defects due to synthesis, in addition, they are better dispersed in water, and it is also possible to obtain thick coating layers.","PeriodicalId":9856,"journal":{"name":"Chemical Journal of Kazakhstan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80525796","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}

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