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Double Resonance Method for Determination of Gel Point 双共振法测定凝胶点
IF 0.4
Journal of Siberian Federal University. Chemistry Pub Date : 2019-06-01 DOI: 10.17516/1998-2836-0115
I. S. Kozhevnikov, L. Altunina, A. Bogoslovsky, Lyubov. Astasyeva
{"title":"Double Resonance Method for Determination of Gel Point","authors":"I. S. Kozhevnikov, L. Altunina, A. Bogoslovsky, Lyubov. Astasyeva","doi":"10.17516/1998-2836-0115","DOIUrl":"https://doi.org/10.17516/1998-2836-0115","url":null,"abstract":"The application of double resonance method for determining the dynamics of fluidity changes of thermotropic gel-forming compositions based on cellulose ether is considered. To determine the gel point, a modified version of the ‘Rheokinetika’ viscometer including two identical sensors and measuring cells of different diameters","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77653741","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 Investigation of the Stability of Solid Acid Catalysts in the Process of Larch Arabinogalactan Hydrolysis in Aqueous Medium 固体酸催化剂在阿拉伯落叶松半乳聚糖水解过程中的稳定性研究
IF 0.4
Journal of Siberian Federal University. Chemistry Pub Date : 2019-06-01 DOI: 10.17516/1998-2836-0126
O. V. Yatsenkova, S. Novikova, A. M. Skripnikov, I. Ivanov, B. Kuznetsov
{"title":"The Investigation of the Stability of Solid Acid Catalysts in the Process of Larch Arabinogalactan Hydrolysis in Aqueous Medium","authors":"O. V. Yatsenkova, S. Novikova, A. M. Skripnikov, I. Ivanov, B. Kuznetsov","doi":"10.17516/1998-2836-0126","DOIUrl":"https://doi.org/10.17516/1998-2836-0126","url":null,"abstract":"The toxic and corrosive mineral acids are used traditionally in the processes of plant polysaccharides hydrolysis. The use of solid acid catalysts improves the environmental safety of hydrolysis processes and simplifies the separation of the catalyst from the reaction products. The stability of solid acid catalysts based on mesoporous SBA-15 and graphite-like carbon material Sibunit-4, containing SO3Hgroups, in the process of larch arabinogalactan hydrolysis at 150 °С was studied. The compositions of the resulting hydrolysates were investigated by gas chromatography. It was established that acidmodified Sibunit-4 does not lose the catalytic activity after three cycles of hydrolysis process for a total duration of 12 hours. Modified SBA-15 catalyst was less stable at the studied conditions. The decrease of monosaccharides concentration in the hydrolysates, the changes in the structure of the catalyst and 40% loss of its weight were found after the third cycle of larch arabinogalactan hydrolysis","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85751867","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
Thermal Transformations of Organic Nitrogen Bases in Resin Components of Oils of Various Types 有机氮碱在各类油类树脂组分中的热转化
IF 0.4
Journal of Siberian Federal University. Chemistry Pub Date : 2019-06-01 DOI: 10.17516/1998-2836-0121
N. Gerasimova, А Sagachenko Татyana, R. S. Min
{"title":"Thermal Transformations of Organic Nitrogen Bases in Resin Components of Oils of Various Types","authors":"N. Gerasimova, А Sagachenko Татyana, R. S. Min","doi":"10.17516/1998-2836-0121","DOIUrl":"https://doi.org/10.17516/1998-2836-0121","url":null,"abstract":"The composition and the structure of organic nitrogen bases of resins of low- and high-resin oils are studied before and after thermal exposure (450 °C, 30 minutes, inert medium). It is found that most of the bases in all samples of resins under study are high-molecular compounds, but their content in thermolized resins is significantly lower. Thermally transformed bases are characterized by lower values of average molecular weights, minority and smaller sizes of structural blocks constituting their mean molecules. A decrease in the overall size of the structural blocks is mainly due to a decrease in the number of saturated cycles in the naphtheno-aromatic system and carbon atoms in alkyl substituents. According to GC-MS data, the bases of all the resins under study are represented by the same sets of alkyl derivatives of quinoline, benzoquinoline, dibenzoquinoline, and azapirene. Alkyl derivatives of thiophenoquinoline and benzothiophenoquinoline are present in the composition of bases of highsulfur oil resins in significant amounts. In all cases, the maximum in the distribution of identified compounds falls to alkyl benzoquinolines. The special feature of organic nitrogen bases of thermally transformed resins is a high content in alkylquinolines and alkylthiophenoquinolines, as well as a higher percentage of structures with a lower number of carbon atoms in alkyl substituents. Thus, the chemical nature of oils is not responsible for main patterns of thermal transformation of organic nitrogen bases in oil resins","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75257017","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
Possibilities of Neural Network Powder Diffraction Analysis Crystal Structure of Chemical Compounds 神经网络粉末衍射分析化合物晶体结构的可能性
IF 0.4
Journal of Siberian Federal University. Chemistry Pub Date : 2019-06-01 DOI: 10.17516/1998-2836-0118
A. Zaloga, V. Stanovov, O. E. Bezrukova, P. Dubinin, I. Yakimov
{"title":"Possibilities of Neural Network Powder Diffraction Analysis Crystal Structure of Chemical Compounds","authors":"A. Zaloga, V. Stanovov, O. E. Bezrukova, P. Dubinin, I. Yakimov","doi":"10.17516/1998-2836-0118","DOIUrl":"https://doi.org/10.17516/1998-2836-0118","url":null,"abstract":"Some possibilities of using convolutional artificial neural networks (ANN) for powder diffraction structural analysis of crystalline substances have been investigated. First, ANNs are used to classify crystalline systems and space groups according to calculated full-profile diffractograms calculated from the crystal structures of the ICSD database (2017 year). The ICSD database contains 192004 structures, of which 80% was used for in-depth network training, and 20% for independent testing of recognition accuracy. The accuracy of classification by a network of crystalline systems was 87.9%, and that of space groups was 77.2%. Secondly, the ANN is used for a similar classification of structural models generated by the stochastic genetic algorithm in the search processes for triclinic crystal structures of test compound K4SnO4 according to their full-profile diffraction patterns. The classification criterion was the entry of one or several atoms into their crystallographic positions in the structure of a substance. Independent deep network training was performed on 120 thousand structural models of the K4PbO4 triclinic structure generated in several runs of the genetic algorithm. The accuracy of the classification of K4SnO4 structural models exceeded 50%. The results show that deeply trained convolutional ANNs can be effective for classifying crystal structures according to the structural characteristics of their powder diffraction patterns","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80660286","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
Self-propagating High-temperature Synthesis of Materials Based on Tungsten Carbide for One-Pot Hydrolysis-Hydrogenolysis of Cellulose Into Ethylene Glycol and 1,2-Propylene Glycol 基于碳化钨的一锅水解-纤维素氢解制备乙二醇和1,2-丙二醇材料的自蔓延高温合成
IF 0.4
Journal of Siberian Federal University. Chemistry Pub Date : 2019-06-01 DOI: 10.17516/1998-2836-0125
N. Gromov, Тatiana B. Medvedeva, I. A. Lukoyanov, A. A. Zhdanok, V. A. Poluboyarov, Оxana P. Тaran, V. Parmon, M. Timofeeva
{"title":"Self-propagating High-temperature Synthesis of Materials Based on Tungsten Carbide for One-Pot Hydrolysis-Hydrogenolysis of Cellulose Into Ethylene Glycol and 1,2-Propylene Glycol","authors":"N. Gromov, Тatiana B. Medvedeva, I. A. Lukoyanov, A. A. Zhdanok, V. A. Poluboyarov, Оxana P. Тaran, V. Parmon, M. Timofeeva","doi":"10.17516/1998-2836-0125","DOIUrl":"https://doi.org/10.17516/1998-2836-0125","url":null,"abstract":"Catalytic systems based on tungsten carbide (WnC) containing mainly W2C were obtained by the method of self-propagating high-temperature synthesis from a mechanochemically activated mixture of tungsten oxide, metallic magnesium, carbon black and CaCO3. The phase composition of the formed materials was shown to depend on the amount of CaCO3. The catalytic properties of the materials were tested in the hydrolysis-hydrogenation of cellulose to ethylene glycol (EG) and 1,2-propylene glycol (PG). It was established that in the presence of WnC the main products of the reaction were EG and PG with a ratio of PG/EG – 1.5-1.8. The deposition of nickel nanoparticles on the WnC surface increased the reaction rate and product yields. The maximum total yield of diols was 47.1 mol. %.","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89290766","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: 2
Hydrophobic Cryogels Based on Polyvinyl Alcohol and Polymeric Oil Resins 基于聚乙烯醇和聚合油树脂的疏水低温冰箱
IF 0.4
Journal of Siberian Federal University. Chemistry Pub Date : 2019-06-01 DOI: 10.17516/1998-2836-0116
M. Fufaeva, Darya V. Fisenko, V. Manzhay, V. G. Bondaletov, L. Altunina
{"title":"Hydrophobic Cryogels Based on Polyvinyl Alcohol and Polymeric Oil Resins","authors":"M. Fufaeva, Darya V. Fisenko, V. Manzhay, V. G. Bondaletov, L. Altunina","doi":"10.17516/1998-2836-0116","DOIUrl":"https://doi.org/10.17516/1998-2836-0116","url":null,"abstract":"The paper presents the results of studies of the flow properties of viscous compositions consisting of polyvinyl alcohol, polymeric oil resin, and water. After a freeze-thaw cycle three-component cryogels are formed from them. Mechanical, thermal, physical, and chemical properties of the resulted elastic samples are studied. The prospects of using hydrophobic cryogels filled with polymeric oil resin as a binder component for road pavement construction are presented","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90107454","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
Conversion of Waste Processing of the Vegetative Part of the Poplar by Indigenous Strains of Fungi of the Genus Trichoderma 本土木霉属真菌菌株对杨树营养部分废弃物处理的转化
IF 0.4
Journal of Siberian Federal University. Chemistry Pub Date : 2019-06-01 DOI: 10.17516/1998-2836-0127
O. O. Mamaeva, E. Isaeva, T. Ryazanova
{"title":"Conversion of Waste Processing of the Vegetative Part of the Poplar by Indigenous Strains of Fungi of the Genus Trichoderma","authors":"O. O. Mamaeva, E. Isaeva, T. Ryazanova","doi":"10.17516/1998-2836-0127","DOIUrl":"https://doi.org/10.17516/1998-2836-0127","url":null,"abstract":"The article presents the results of a study of the impact of the enzyme complex strains M99-9 and K6-15 micro-peach fungi of the genus Trichoderma on a mixed substrate. It is established that in the process of biodegradation with strains K6-15 M99-9 in the substrate reduced content of extractives 2.1-2.4 times that of the polysaccharide is 1.5-1.8 times, and ligninase substances 1.2-1.4 times. This was an accumulation of up to 9-12% of humic substances. The decrease in the mass of the substrate during the cultivation of the strain M99-9 was 17.3%, and the strain K6 – 15-30% less. The most productive on this substrate is strain K6-15. The growth of conidia within two weeks of cultivation for strain K6-15 was 16.6·108 CFU/g and strain M99-9 – 11,5·108 CFU/g. High yield of spores and formation of humic substances during cultivation of fungi of the genus Trichoderma makes it possible to use the vegetative part of a poplar as raw materials for receiving a biological product “Trichodermin” or humification of the soil","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84269409","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 of Sulphanylamides from New Derivatives of Aminopyrazoles 氨基吡唑新衍生物合成磺胺类胺
IF 0.4
Journal of Siberian Federal University. Chemistry Pub Date : 2019-06-01 DOI: 10.17516/1998-2836-0122
I. G. Povarov, V. Efimov, A. V. Lyubyashkin, Anna S. Kositsyna, G. A. Suboch, M. S. Tovbis
{"title":"Synthesis of Sulphanylamides from New Derivatives of Aminopyrazoles","authors":"I. G. Povarov, V. Efimov, A. V. Lyubyashkin, Anna S. Kositsyna, G. A. Suboch, M. S. Tovbis","doi":"10.17516/1998-2836-0122","DOIUrl":"https://doi.org/10.17516/1998-2836-0122","url":null,"abstract":"For the newly synthesized 3-aryl-5-methoxymethyl-4-amino-1H-pyrazoles the sulfonylation reaction of the amino group by p-acetamidobenzenesulfonyl chloride was carried out. As a result, sulfanilamide derivatives of substituted aminopyrazoles identified using NMR1H, IR spectroscopy and mass spectrometry were obtained for the first time","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90564762","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: 2
Emulsion Copolymerization of Polyangelicalactone with Styrene 聚天使内酯与苯乙烯的乳液共聚
IF 0.4
Journal of Siberian Federal University. Chemistry Pub Date : 2019-06-01 DOI: 10.17516/1998-2836-0124
K. L. Kaygorodov, V. Tarabanko, M. Smirnova, N. Tarabanko, Y. Malyar, V. D. Voronchikhin
{"title":"Emulsion Copolymerization of Polyangelicalactone with Styrene","authors":"K. L. Kaygorodov, V. Tarabanko, M. Smirnova, N. Tarabanko, Y. Malyar, V. D. Voronchikhin","doi":"10.17516/1998-2836-0124","DOIUrl":"https://doi.org/10.17516/1998-2836-0124","url":null,"abstract":"For the first time emulsion polymerization of polyangelicalactone with styrene was carried out. Block copolymers with a molecular weight of 40000-1000000 and containing 5-40 wt. % of styrene were prepared. Polymerization rate constants were evaluated. Mechanical properties were evaluated after the copolymers were cured. The cured block copolymers satisfy the basic requirements for high impact polystyrene, and they are biodegradable","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84627121","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
Examination of Structural Parameters and Acid-Base Properties of Thiobarbituric Acid 硫代巴比妥酸的结构参数及酸碱性质研究
IF 0.4
Journal of Siberian Federal University. Chemistry Pub Date : 2019-03-01 DOI: 10.17516/1998-2836-0104
P. Alexander, M. Natália, R. S. Edward
{"title":"Examination of Structural Parameters and Acid-Base Properties of Thiobarbituric Acid","authors":"P. Alexander, M. Natália, R. S. Edward","doi":"10.17516/1998-2836-0104","DOIUrl":"https://doi.org/10.17516/1998-2836-0104","url":null,"abstract":"The stepwise proton-ligand stability constant of thiobarbituric acid (TBA) singly charged anion was determined in an aqueous solution via pH-metry and UV-spectrophotometry at ionic strength I = 0.1 (NaCl) and temperature T = 20 °C (25 °C). The values (lg æ2) obtained by these methods show satisfactory convergence, namely, 2.30 ± 0.01 (20 °C), 2.16 ± 0.01 (25 °C) and 2.37 ± 0.06 (20 °C), respectively. Additionally, the UV-spectrophotometry results have shown that TBA could exist in the two conjugate forms within pH of 1.1–9.2. Quantum chemical calculations have confirmed that the keto-form is more thermodynamically stable than the enol one. The obtained values for geometric parameters and for the effective charges on Mulliken atoms make it possible to describe the structure of this tautomer and to argue that the acid mainly functions as an Nand/or O-donor ligand during the complexation with metal ions. IR-spectroscopy data have confirmed that the investigated solid thiobarbituric acid has represented mainly by ketone tautomer.","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78813496","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
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