Voprosy Khimii i Khimicheskoi Tekhnologii最新文献_第3页

Influence of stearic acid on the properties of wood-polymer composites 硬脂酸对木-聚合物复合材料性能的影响

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-10-01 DOI: 10.32434/0321-4095-2023-150-5-50-54

D.S. Kryvolapov, K.M. Sukhyy, P.I. Bashtanyk, A.O. Tretyakov, V.A. Bezrukavy

引用次数: 0

Densely sintered carbide-silicon ceramics on a glass-crystal binder of cordierite composition 在堇青石组成的玻璃晶体粘结剂上致密烧结碳化物-硅陶瓷

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-10-01 DOI: 10.32434/0321-4095-2023-150-5-98-105

Sergii Polozhaj, Oleksandr Zaichuk, Кostyantyn Sukhyy, Andrii Polozhaj

{"title":"Densely sintered carbide-silicon ceramics on a glass-crystal binder of cordierite composition","authors":"Sergii Polozhaj, Oleksandr Zaichuk, Кostyantyn Sukhyy, Andrii Polozhaj","doi":"10.32434/0321-4095-2023-150-5-98-105","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-150-5-98-105","url":null,"abstract":"The high density of silicon carbide ceramics is a prerequisite for obtaining materials with high strength. A promising technology for preparation of such materials at relatively low temperatures is the use of glass crystal bonds. The paper presents the results of studies on ceramic materials based on silicon carbide using glass in the pseudoternary system MgO–Al2O3–SiO2 as a glass binder. The composition of the glass corresponds to a ternary eutectic with a temperature of 13650C, which is located at the boundary of the primary crystallization fields, where one of the phases is cordierite. It has been determined that it is necessary to mechanically activate the components of the raw material mixture to obtain densely sintered ceramics. In this case, the most rational ratio between SiC filler and glass binder, which provides the maximum mechanical compressive strength (up to 700 MPa), is 60:40. It has been established that the crystallization of the glass binder plays a decisive role in determining the formation temperature of dense silicon carbide materials. The compaction occurs due to the movement of dispersed silicon carbide particles in the softened glass melt under the influence of thermal vibrations. The subsequent process of fine-dispersed crystallization of the glass binder during cooling during firing provides strengthening of the structure of the synthesized materials. The proposed integrated approach to the intensification of the sintering process is promising for obtaining durable silicon carbide ceramics with low synthesis temperatures (up to 16000C). A sufficiently high strength of the experimental ceramics will ensure its competitiveness with respect to traditional materials, including those used as wear and impact resistant.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136160528","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

Research on the combined effect of silencers and dyes on the coloring of enamel coatings 消声器与染料对搪瓷涂料着色的联合作用研究

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-10-01 DOI: 10.32434/0321-4095-2023-150-5-106-113

O. Ryzhova, S. Matsenko, S. Naumenko

引用次数: 0

Pseudocatalytic acceleration of hydrothermal leaching of amylose from starch in acidic media 酸性介质中淀粉水热浸出直链淀粉的伪催化加速

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-10-01 DOI: 10.32434/0321-4095-2023-150-5-72-81

V.D. Myrhorodska-Terentieva, M.V. Nikolenko, I.V. Sknar, Yе.S. Osokin, О.V. Prylovskyi, O.V. Volnyanska, M.O. Mironyak

{"title":"Pseudocatalytic acceleration of hydrothermal leaching of amylose from starch in acidic media","authors":"V.D. Myrhorodska-Terentieva, M.V. Nikolenko, I.V. Sknar, Yе.S. Osokin, О.V. Prylovskyi, O.V. Volnyanska, M.O. Mironyak","doi":"10.32434/0321-4095-2023-150-5-72-81","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-150-5-72-81","url":null,"abstract":"Kinetic studies were conducted at 60–700C using buffer solutions with pH 3–5 to establish the effect of solution acidity on the efficiency of amylose leaching from starch. It was shown that the kinetic data are well described by the Kruger-Ziegler model. It was established that as the pH of the solutions decreases from 5.0 to 3.0, the activation energy of amylose leaching process decreases from 185 to 22 kJ/mol, and its dependence on hydrogen ion concentration is described by two linear segments within the pH ranges of 3.0–3.3 and 3.6–5.0. The effect of reducing the hydrogen bond energy upon addition of an additional proton to the water molecule was demonstrated through quantum-chemical modeling using the Gaussian 09 software. It was shown that protonation of the water molecule leads to a decrease in the effective charge on the oxygen atom from –0.626 to –0.142 unit of electron charge. At the same time, the linearity of the hydrogen bond along the –ОН–О– atoms is violated, the length of the hydrogen bond increases from 1.856 to 2.370 Å, and the binding energy decreases by 4.6 times. Thus, hydrogen ions can be considered as a kind of pseudo-catalyst for the process of amylose leaching from starch grains, since in their presence the activation energy of the process decreases and its rate increases. It was concluded that the process of hydrothermal leaching of amylose from starch can be intensified by carrying it out in acidic media without additional heating of starch suspensions.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136127939","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

Development of compositions of slag-alkaline binding materials for pavement products 路面用渣碱粘结材料的研制

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-10-01 DOI: 10.32434/0321-4095-2023-150-5-147-154

G.M. Shabanova, A.M. Korogodska, V.M. Shumeiko, O.M. Borysenko, G.V. Lisachuk, R.V. Kryvobok, M.D. Sakhnenko

{"title":"Development of compositions of slag-alkaline binding materials for pavement products","authors":"G.M. Shabanova, A.M. Korogodska, V.M. Shumeiko, O.M. Borysenko, G.V. Lisachuk, R.V. Kryvobok, M.D. Sakhnenko","doi":"10.32434/0321-4095-2023-150-5-147-154","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-150-5-147-154","url":null,"abstract":"In this work, blast furnace granulated slag of the Kamet-Stal plant was investigated. It was established that the slag belongs to the basic ones. According to the quality factor, the slag belongs to grade 1 and can be used to fabricate slag-alkaline binding material by the alkaline method of activation. A significant part of the slag is in an X-ray amorphous state, which contributes to the production of strong cement stone in the late stages of hardening. The crystalline phases of the slag exhibit weak binding properties and provide strength to the hardened slag-alkaline binding material. To activate the slag and plasticize the composition, portland cement and clay were introduced into it, sodium liquid glass, caustic soda solution and soda ash solution being used as an alkaline sealer. The exclusion of clay from the basic composition leads to an increase in strength almost twice due to additional activation of slag with portland cement. A significant drawback in this case is the numerous precipitates that appear on the samples already on the first day of hardening. Thus, for accelerated curing times, increased mechanical strength, reduction in the amount of leaching and a significant reduction in the cost of finished products, we suggested the composition containing 91 wt.% slag; 6 wt.% clay; and 3 wt.% portland cement closed with a solution of liquid glass with a modulus of 2.3 and a density of 1300 kg/m3.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136127940","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

Disposal of sulfur anhydride of industrial gaseous wastes by modified natural zeolites 改性天然沸石处理工业废气中酸酐硫的研究

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-10-01 DOI: 10.32434/0321-4095-2023-150-5-5-13

L.R. Harutyunyan, L.S. Tangamyan, H.R. Petrosyan, R.K. Adamyan, H.H. Sargsyan, R.S. Harutyunyan

{"title":"Disposal of sulfur anhydride of industrial gaseous wastes by modified natural zeolites","authors":"L.R. Harutyunyan, L.S. Tangamyan, H.R. Petrosyan, R.K. Adamyan, H.H. Sargsyan, R.S. Harutyunyan","doi":"10.32434/0321-4095-2023-150-5-5-13","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-150-5-5-13","url":null,"abstract":"The effectiveness of sulfur anhydride sorption from roasted molybdenum concentrate gaseous wastes by modified natural zeolites has been studied. Clinoptilolite from Nor Koghb deposit (Noyemberyan, Armenia) has been used as natural zeolite. The modification of zeolite has been done by thermic, acidic and alkaline treatments. It has been established that both thermally and chemically modified zeolites of Nor Koghb deposit are effective sorbents for sorption of sulfur anhydride; moreover, it is determined that the alkaline modified samples of zeolite have the highest sorption ability. Sulfur anhydride has been produced by the three following sources: pure molybdenum disulfate, non-treated molybdenum concentrate from Zangezur Copper Molybdenum Combine (Armenia) and the same molybdenum concentrate after thermal treatment. The highest effectiveness of sulfur anhydride sorption is obtained when pure molybdenum disulfide is used as a sulfur anhydride source. This result is quite predictable because pure molybdenum disulfide practically all turns to sulfur anhydride while additives are present in molybdenum concentrate, which do not produce sulfur anhydride.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136160438","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

Modeling of new potential inhibitors of dihydrofolate reductase based on 1,3,4-thiadiazole amidoalkyl derivatives 基于1,3,4-噻二唑酰胺烷基衍生物的新型潜在二氢叶酸还原酶抑制剂的建模

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-10-01 DOI: 10.32434/0321-4095-2023-150-5-91-97

V.V. Pavlova, P.V. Zadorozhnii, V.V. Kiselev, A.V. Kharchenko, O.V. Okhtina

{"title":"Modeling of new potential inhibitors of dihydrofolate reductase based on 1,3,4-thiadiazole amidoalkyl derivatives","authors":"V.V. Pavlova, P.V. Zadorozhnii, V.V. Kiselev, A.V. Kharchenko, O.V. Okhtina","doi":"10.32434/0321-4095-2023-150-5-91-97","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-150-5-91-97","url":null,"abstract":"Derivatives of 1,3,4-thiadiazole are very important for medical chemistry and pharmacy as potential drug substances. In this work, we carried out molecular docking studies of amidoalkyl derivatives of 1,3,4-thiadiazole: N-(2,2,2-trichloro-1-((5-aryl-1,3,4-thiadiazol-2-yl)amino)ethyl)carboxamides and N-(2,2,2-trichloro-1-((5-(arylamino)-1,3,4-thiadiazol-2-yl)amino)ethyl)carboxamides with dihydrofolate reductase (DHFR). The AutoDock Vina program based on the PyRx 0.8 platform was used for docking. Before docking, the enzyme structure (PDB ID: 1DLS) was prepared using the Chimera 1.14 program, and the structures of potential inhibitors and reference preparations were optimized by the PM3 method in the ArgusLab 4.0.1 program. According to the results of molecular docking, the analyzed compounds effectively interact with the active site of DHFR. It is shown that the introduction of an NH group between the 1,3,4-thiadiazole and aromatic rings leads to stronger binding of ligands to DHFR. Based on the results of molecular docking, the following hit compounds were selected: 4-methyl-N-(2,2,2-trichloro-1-((5-(phenylamino)-1,3,4-thiadiazol-2-yl)amino)ethyl)benzamide and 4-methyl-N-(2,2,2-trichloro-1-((5-(p-tolylamino)-1,3,4-thiadiazol-2-yl)amino)ethyl)benzamide, which are superior to the reference compounds according to the strength of the formed complex.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136127937","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

Regioselective synthesis of new (imidazo[2,1-b] [1,3]-thiazin-6-yl)-1,2,3-triazole-5-carboxylates as potential antimicrobial agents 新咪唑[2,1-b][1,3]-噻嗪-6-基)-1,2,3-三唑-5-羧酸盐的区域选择性合成

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-10-01 DOI: 10.32434/0321-4095-2023-150-5-114-122

N.Yu. Slyvka, L.M. Saliyeva, M.B. Litvinchuk, A.M. Grozav, N.D. Yakovychuk, M.V. Vovk

{"title":"Regioselective synthesis of new (imidazo[2,1-b] [1,3]-thiazin-6-yl)-1,2,3-triazole-5-carboxylates as potential antimicrobial agents","authors":"N.Yu. Slyvka, L.M. Saliyeva, M.B. Litvinchuk, A.M. Grozav, N.D. Yakovychuk, M.V. Vovk","doi":"10.32434/0321-4095-2023-150-5-114-122","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-150-5-114-122","url":null,"abstract":"The paper presents the results of the study on the interaction of azido(benz)imidazo[2,1-b][1,3]thiazines with acetylene carboxylates under non-catalytic conditions according to Huguesgen. It was established that the [3+2]-cyclocondensation of the specified reagents occurs regioselectively upon heating and without the use of a catalyst with the formation of a 1,4-addition product, alkyl 1-((benzo)imidazo[2,1-b][1,3]thiazine-6-yl)-1H-1,2,3-triazole-5-carboxylates 4a–g, the structure of which was thoroughly proved by the methods of 1H (13C) NMR spectroscopy and chromatography-mass spectrometry. All obtained compounds were investigated in vitro experiments for antibacterial and antifungal activity. Based on the results of bioscreening, methyl 1-(2,3-diphenyl-6,7-dihydro-5H-imidazo[2,1-b][1,3]thiazin-6-yl)-1H-1,2,3- triazole-5-carboxylate 4b, ethyl 1-(2,3-diphenyl-6,7-dihydro-5H-imidazo[2,1-b][1,3]thiazin-6-yl)-1H-1,2,3-triazole-5-carboxylate 4c, methyl 1-(3,4-dihydro-2H-benz[4,5]imidazo[2,1-b][1,3]thiazin-3-yl)-1H-1,2,3-triazole-5-carboxylate 4e, tert-butyl 1-(3,4-dihydro-2H-benz[4,5]imidazo[2,1-b][1,3]thiazine-3-yl)-1H-1,2,3-triazole-5-carboxylate 4g showed a bactericidal effect at a concentration of 31.25 g/ml against the bacterium Proteus mirabilis.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136160564","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

Research on clay raw materials for manufacturing of clinker bricks 熟料砖生产用粘土原料的研究

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-10-01 DOI: 10.32434/0321-4095-2023-150-5-135-146

О. Khomenko, B. Datsenko, G. Fomenko

引用次数: 0

The effect of hardening activators on the physical and mechanical properties of slag-alkaline binding materials 硬化活化剂对渣碱结合材料物理力学性能的影响

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-10-01 DOI: 10.32434/0321-4095-2023-150-5-155-162

G.M. Shabanova, A.M. Korogodska, V.M. Shumeiko, L.P. Shchukina, G.V. Lisachuk, R.V. Kryvobok

引用次数: 0