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Preparation and Study of Properties of a New Biocomposite of Chitosan with 5,7-Bis(1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl)-8-hydroxyquinoline 壳聚糖- 5,7-二(1-羟基-1-三氟甲基-2,2,2-三氟乙基)-8-羟基喹啉生物复合材料的制备及性能研究
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-03-12 DOI: 10.1134/S0012501621110014
I. S. Chaschin, E. I. Perepelkin, V. I. Dyachenko
{"title":"Preparation and Study of Properties of a New Biocomposite of Chitosan with 5,7-Bis(1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl)-8-hydroxyquinoline","authors":"I. S. Chaschin,&nbsp;E. I. Perepelkin,&nbsp;V. I. Dyachenko","doi":"10.1134/S0012501621110014","DOIUrl":"10.1134/S0012501621110014","url":null,"abstract":"<p>A new bioorganic composite was obtained by impregnation of 5,7-bis(1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl)-8-hydroxyquinoline (FOQ) into chitosan in 60% acetic acid. The resulting complex was found to be highly stable due to hydrogen bonding between the amino groups of chitosan and the highly acidic OH groups of FOQ. This composite inhibited the growth of gram-positive and gram-negative bacteria to a much greater extent than pristine chitosan. It is expected that the biocomposite would be used as an antibacterial coating with a prolonged service life for collagen matrices used for cardiac prostheses.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"501 1","pages":"114 - 118"},"PeriodicalIF":0.9,"publicationDate":"2022-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4504789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Vaporization Thermodynamics of GeO2 by High-Temperature Mass Spectrometry 高温质谱法研究GeO2的汽化热力学
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-03-12 DOI: 10.1134/S0012501621120010
A. S. Smirnov, K. G. Smorchkov, N. A. Gribchenkova, A. S. Alikhanyan
{"title":"Vaporization Thermodynamics of GeO2 by High-Temperature Mass Spectrometry","authors":"A. S. Smirnov,&nbsp;K. G. Smorchkov,&nbsp;N. A. Gribchenkova,&nbsp;A. S. Alikhanyan","doi":"10.1134/S0012501621120010","DOIUrl":"10.1134/S0012501621120010","url":null,"abstract":"<p>Vaporization of GeO<sub>2</sub> (tetragonal and hexagonal) have been studied by the Knudsen effusion method in combination with mass spectrometry in the temperature range 1250–1370 K. It has been demonstrated that the saturated vapor over GeO<sub>2</sub> consists of GeO and O<sub>2</sub> molecules. Partial pressures of the equilibrium vapor components and their temperature dependences have been determined. The standard enthalpy of the heterogeneous reaction GeO<sub>2(s)</sub> = GeO<sub>(g)</sub> + 1/2O<sub>2(g)</sub> and the standard enthalpy of formation of GeO<sub>2</sub> (∆<sub><i>f</i></sub><i>H</i><span>(_{{298}}^{^circ })</span>(GeO<sub>(g)</sub>) = −41.7 ± 17.6 kJ mol<sup>–1</sup>) have been determined by the second- and third-law calculations.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"501 2","pages":"119 - 125"},"PeriodicalIF":0.9,"publicationDate":"2022-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4500898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Surface Modification of Nanoparticles on the Mechanical Properties of Highly Crosslinked Epoxy Nanocomposites: Mesoscopic Simulation 纳米颗粒表面改性对高交联环氧纳米复合材料力学性能的影响:介观模拟
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-02-10 DOI: 10.1134/S0012501621090025
M. D. Malyshev, D. V. Guseva, P. V. Komarov
{"title":"Effect of Surface Modification of Nanoparticles on the Mechanical Properties of Highly Crosslinked Epoxy Nanocomposites: Mesoscopic Simulation","authors":"M. D. Malyshev,&nbsp;D. V. Guseva,&nbsp;P. V. Komarov","doi":"10.1134/S0012501621090025","DOIUrl":"10.1134/S0012501621090025","url":null,"abstract":"<p>A mesoscopic model of a nanocomposite based on crosslinked polymer networks with embedded clay nanoparticles was developed. The model makes it possible to predict the main trends in changes in the mechanical properties of systems, taking into account the degree of crosslinking of nanoparticles with a polymer matrix. The performed simulations showed that modified nanoparticles can significantly improve the Young’s modulus of the nanocomposite compared to the unfilled polymer. It was also shown that the average value of the number of load-bearing chains determines the mechanical response of the coarse-grained model of the polymer system.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"500 1","pages":"92 - 96"},"PeriodicalIF":0.9,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4723489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sulfonated Films of Polyphenylquinoxaline. Preparation and Properties 聚苯基喹啉磺化膜。制备及性能
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-02-10 DOI: 10.1134/S0012501621100018
M. I. Buzin, E. G. Bulycheva, N. M. Belomoina, G. G. Nikiforova, I. O. Volkov, A. N. Shchegolikhin, S. A. Bedin
{"title":"Sulfonated Films of Polyphenylquinoxaline. Preparation and Properties","authors":"M. I. Buzin,&nbsp;E. G. Bulycheva,&nbsp;N. M. Belomoina,&nbsp;G. G. Nikiforova,&nbsp;I. O. Volkov,&nbsp;A. N. Shchegolikhin,&nbsp;S. A. Bedin","doi":"10.1134/S0012501621100018","DOIUrl":"10.1134/S0012501621100018","url":null,"abstract":"<p>A promising method was proposed for the sulfonation of polyphenylquinoxaline films with sulfuric acid. The sulfonation in the films was confirmed by X-ray photoelectron and IR spectroscopies. The thermal characteristics and dielectric properties of the sulfonated films were studied.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"500 2","pages":"97 - 100"},"PeriodicalIF":0.9,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4417569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Condensed Products of Combustion of Boron-Based Solid Propellants 硼基固体推进剂燃烧的冷凝产物
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-02-10 DOI: 10.1134/S0012501621090013
A. V. Fedorychev,  Yu. M. Milekhin, S. A. Rashkovskii
{"title":"Condensed Products of Combustion of Boron-Based Solid Propellants","authors":"A. V. Fedorychev,&nbsp; Yu. M. Milekhin,&nbsp;S. A. Rashkovskii","doi":"10.1134/S0012501621090013","DOIUrl":"10.1134/S0012501621090013","url":null,"abstract":"<p>Condensed combustion products of model propellants based on aluminum boride in the combustion chamber of the gas generator of a ducted rocket engine have been studied. The mass fraction of the condensed combustion products, their chemical composition, and their particle size distribution have been determined. It has been demonstrated that the condensed combustion products mainly contain boron compounds with carbon, nitrogen, and oxygen, and it is in this form that boron enters the secondary combustion chamber of the ducted rocket engine. The mass fraction of elemental boron in the condensed combustion products does not exceed 15% and decreases with increasing pressure. It has been found that, regardless of the types and contents of the major components of the model propellants, there are no large (more than 100 μm in size) particle conglomerates at the outlet of the gas-generator nozzle. A comparison of the experimental data with the results of thermodynamic calculations indicates that the calculation methods should be corrected for the nonequilibrium of the combustion products.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"500 1","pages":"79 - 84"},"PeriodicalIF":0.9,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4416783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Effect of Low Temperatures and Moisture on the Strength Performance of Carbon Fiber Reinforced Plastic 低温和潮湿对碳纤维增强塑料强度性能的影响
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-02-10 DOI: 10.1134/S0012501621090037
M. G. Petrov,  M. P. Lebedev, O. V. Startsev, M. M. Kopyrin
{"title":"Effect of Low Temperatures and Moisture on the Strength Performance of Carbon Fiber Reinforced Plastic","authors":"M. G. Petrov,&nbsp; M. P. Lebedev,&nbsp;O. V. Startsev,&nbsp;M. M. Kopyrin","doi":"10.1134/S0012501621090037","DOIUrl":"10.1134/S0012501621090037","url":null,"abstract":"<p>The service life of a carbon fiber reinforced plastic used in an aircraft intended for operation under Arctic extreme conditions was studied by longitudinal bend testing in which monotonic loading at various speeds of displacement of the mobile gripper of a testing machine was combined with cyclic loading of specimens with increasing displacement range. The force dependences of the activation energy of failure and the dependences between the failure rate, deformation rate, and service life were characterized. Exposure of the carbon fiber reinforced plastic to subfreezing temperatures was shown to hardly affect the service life. However, periodic transitions through the crystallization temperature of water accumulated in the composite significantly impair its strength performance and safe service life.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"500 1","pages":"85 - 91"},"PeriodicalIF":0.9,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4413595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
High-Temperature Thermal Conductivity of Thulium Orthovanadate 正钒酸铥的高温导热性
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-02-10 DOI: 10.1134/S0012501621100031
O. N. Kondrat’eva, G. E. Nikiforova, M. N. Smirnova, A. V. Khoroshilov, K. V. Petrova, V. M. Gurevich
{"title":"High-Temperature Thermal Conductivity of Thulium Orthovanadate","authors":"O. N. Kondrat’eva,&nbsp;G. E. Nikiforova,&nbsp;M. N. Smirnova,&nbsp;A. V. Khoroshilov,&nbsp;K. V. Petrova,&nbsp;V. M. Gurevich","doi":"10.1134/S0012501621100031","DOIUrl":"10.1134/S0012501621100031","url":null,"abstract":"<p>Thulium orthovanadate-based ceramic materials have been synthesized by solid-phase sintering. Their phase and elemental compositions have been studied. The thermophysical properties of TmVO<sub>4</sub> at high temperatures have been studied experimentally. The thermal diffusivity of TmVO<sub>4</sub>-based ceramics has been measured for the first time by the laser flash method. From these data and heat capacities measured by the DSC method, the thermal conductivity of TmVO<sub>4</sub> has been determined.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"500 2","pages":"101 - 104"},"PeriodicalIF":0.9,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4416161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Heat Capacity and Thermodynamic Functions of the Lu2O3 ⋅ 2HfO2 Solid Solution Lu2O3·2HfO2固溶体的热容及热力学函数
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2022-02-10 DOI: 10.1134/S001250162110002X
A. V. Guskov, P. G. Gagarin, V. N. Guskov, A. V. Tyurin, K. S. Gavrichev
{"title":"Heat Capacity and Thermodynamic Functions of the Lu2O3 ⋅ 2HfO2 Solid Solution","authors":"A. V. Guskov,&nbsp;P. G. Gagarin,&nbsp;V. N. Guskov,&nbsp;A. V. Tyurin,&nbsp;K. S. Gavrichev","doi":"10.1134/S001250162110002X","DOIUrl":"10.1134/S001250162110002X","url":null,"abstract":"<p>The molar heat capacity of the Lu<sub>2</sub>O<sub>3</sub> ⋅ 2HfO<sub>2</sub> solid solution has been determined at 4.5–347 K, and its thermodynamic functions have been calculated in the range 0–1300 K.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"500 2","pages":"105 - 109"},"PeriodicalIF":0.9,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4416173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Polymerization of Isoprene Using Cationic Catalytic Systems Based on Triethylaluminum 基于三乙基铝的阳离子催化体系聚合异戊二烯
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2021-12-01 DOI: 10.1134/S0012501621080017
V. A. Rozentsvet, N. A. Sablina, D. M. Ulyanova, P. M. Tolstoy,  I. A. Novakov
{"title":"Polymerization of Isoprene Using Cationic Catalytic Systems Based on Triethylaluminum","authors":"V. A. Rozentsvet,&nbsp;N. A. Sablina,&nbsp;D. M. Ulyanova,&nbsp;P. M. Tolstoy,&nbsp; I. A. Novakov","doi":"10.1134/S0012501621080017","DOIUrl":"10.1134/S0012501621080017","url":null,"abstract":"<p>A new efficient method for the synthesis of soluble thermoplastic polymers of isoprene with softening points in the range from 73 to 160°C has been developed. The method consists in the cationic polymerization of isoprene in dichloromethane or toluene in the presence of catalytic systems based on triethylaluminum in combination with <i>tert</i>-butyl chloride, <i>tert</i>-butyl bromide, 2-chloro-2-methylbutane, or isopropyl chloride.</p>","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"499 2","pages":"73 - 76"},"PeriodicalIF":0.9,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4015466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Erratum to: Rapid Conversion of Methane to Hydrogen Stimulated by Microwave Irradiation on the Surface of a Carbon Adsorbent 碳吸附剂表面微波辐照刺激甲烷快速转化为氢的勘误
IF 0.9 4区 化学
Doklady Physical Chemistry Pub Date : 2021-12-01 DOI: 10.1134/S0012501621390019
A. V. Chistyakov, G. I. Konstantinov, M. V. Tsodikov,  A. L. Maximov
{"title":"Erratum to: Rapid Conversion of Methane to Hydrogen Stimulated by Microwave Irradiation on the Surface of a Carbon Adsorbent","authors":"A. V. Chistyakov,&nbsp;G. I. Konstantinov,&nbsp;M. V. Tsodikov,&nbsp; A. L. Maximov","doi":"10.1134/S0012501621390019","DOIUrl":"10.1134/S0012501621390019","url":null,"abstract":"","PeriodicalId":532,"journal":{"name":"Doklady Physical Chemistry","volume":"499 2","pages":"77 - 77"},"PeriodicalIF":0.9,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4378072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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