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Труды сотрудников Института органического синтеза УрО РАН - результаты поиска

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Каталог книг и продолжающихся изданий
Сводный каталог иностранных периодических изданий, имеющихся в библиотеках УрО РАН
Сводный каталог отечественных периодических изданий, имеющихся в библиотеках УрО РАН
Каталог диссертаций и авторефератов диссертаций УрО РАН
Каталог препринтов УрО РАН (1975 г. - )
Имидж-каталог отечественных книг (до 2010 г.)
Имидж-каталог иностранных книг (до 2010 г.)
Алфавитно-предметный указатель (АПУ) ЦНБ УрО РАН
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Нанотехнологии
Демидовские премии
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История Урала
Личная библиотека С. В. Вонсовского
Книжная коллекция Шубиных
Труды Института высокотемпературной электрохимии УрО РАН
Труды Института истории и археологии УрО РАН
Труды сотрудников Института горного дела УрО РАН
Труды сотрудников Института органического синтеза УрО РАН
Труды сотрудников Института теплофизики УрО РАН
Труды сотрудников Института химии твердого тела УрО РАН
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Труды сотрудников ЦНБ УрО РАН
Публикации Черешнева В.А.
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Каталог библиотеки ИГД УрО РАН
Каталог библиотеки ИЭРиЖ УрО РАН
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 Найдено в других БД:Каталог книг и продолжающихся изданий (22)Сводный каталог иностранных периодических изданий, имеющихся в библиотеках УрО РАН (4)Нанотехнологии (1)Труды Института высокотемпературной электрохимии УрО РАН (25)Труды сотрудников Института теплофизики УрО РАН (106)Труды сотрудников Института химии твердого тела УрО РАН (28)Расплавы (22)Публикации Черешнева В.А. (2)Публикации Чарушина В.Н. (2)Каталог библиотеки ИЭРиЖ УрО РАН (4)
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Общее количество найденных документов : 16
Показаны документы с 1 по 16
1.
Инвентарный номер: нет.
   
   C 21

   
    Carboxyalkylation of chitosan in the gel state / Yu. A. Skorik, A. V. Pestov, M. I. Kodess, Yu. G. Yatluk // Carbohydrate Polymers. - 2012. - Vol. 90, № 2. - С. 1176-1181
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CHITOSAN -- CHEMICAL MODIFICATION -- GEL TECHNIQUE
Аннотация: This study presents a new approach for direct carboxyalkylation of chitosan in the gel state by using aza-Michael addition and substitution reactions. Various reagents were applied including acrylic and crotonic acids, and alpha-, beta-, gamma-, delta-, and epsilon-halocarboxylic acids. The reaction of chitosan with gamma- and delta-halocarboxylic acids showed no target product formation either in solution or in the gel state. In the case of acrylic, crotonic, alpha- and beta-halocarboxylic acids, the reaction performed in the gel state (concentration of chitosan 20-40%) shows higher degree of substitution at lower reaction time and temperature than in diluted solutions (concentration of chitosan 0.5-2%). The results were discussed in terms of kinetics of the target and side reactions. H-1 and C-13 NMR confirmed that in all cases the carboxyalkylation of chitosan proceeds exclusively at the amino groups

\\\\Expert2\\nbo\\Carbohydrate Polymers\\2012, v. 90, p.1176.pdf
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2.
Инвентарный номер: нет.
   
   C 31

   
    Catalytic effect of nanosized metal oxides in the Biginelli reaction [Text] / O. V. Fedorova, M. S. Valova, Yu. A. Titova, I. G. Ovchinnikova, A. N. Grishakov, M. A. Uimin, A. E. Ermakov, G. L. Rusinov, V. N. Charushin // Kinetics and Catalysis. - 2011. - Vol. 52, № 2. - P226-233. - Bibliogr. : p. 233 (21 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The effect of nanosized metal oxides on the regio- and stereoselectivity of the multicomponent Biginelli reaction and the reaction mechanism under conditions of heterogeneous catalysis were studied. It was found that the considerable activation of reagents occurred on the surface of metal nanooxides. The Biginelli reaction occurred by two mechanisms: a carbocationic mechanism took place along with the generally accepted mechanism (through the N-acyliminium ion). Nanosized metal oxides in the presence of chiral inductors increased the regio- and stereoselectivity of the Biginelli reaction

\\\\Expert2\\nbo\\Kinetics and Catalysis\\2011, v. 52, N 2, p. 226.pdf
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3.
Инвентарный номер: нет.
   
   C 31

   
    Catalytic effect of nanosized metal oxides on the Hantzsch reaction [Text] / O. V. Fedorova, O. V. Koryakova, M. S. Valova, I. G. Ovchinnikova, Yu. A. Titova, G. L. Rusinov, V. N. Charushin // Kinetics and Catalysis. - 2010. - Vol. 51, № 4. - P566-572
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
METAL OXIDES -- HANTZSCH REACTION -- ALUMINUM OXIDES
Аннотация: The effect of nanosized copper and aluminum oxides, which have a higher sorption capacity than that of bulk samples, on the Hantzsch reaction was studied. The adsorption of starting benzaldehydes and ethyl acetoacetate on the surface of copper and aluminum nanooxides resulted in the activation of these molecules and accelerated the Hantzsch reaction. In addition, considerable activation of ammonia and intermediates (chalcone and enamine) on the surface of aluminum nanooxide facilitated an increase in the rate and selectivity of the process. The experimental results were used to develop a one-pot method for the preparation of nifedipine and nitrendipine

\\\\Expert2\\nbo\\Kinetics and Catalysis\\2010, v. 51, N 4, p. 566-572.pdf
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4.
Инвентарный номер: нет.
   
   G 34

   
    Gel-synthesis, structure, and properties of sulfur-containing chitosan derivatives [Electronic resource] / A. V. Pestov, O. V. Koryakova, I. I. Leonidov, Yu. G. Yatluk // Russian Journal of Applied Chemistry. - 2010. - Vol. 83, № 5. - P787-794
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The possibility of using the thermochemical approach to thermal decomposition of solids, previously developed by the author, to interpretation of the mechanism and kinetics of reduction of metal oxides with hydrogen was studied. Many properties of NiO reduction with hydrogen, including formation of metal nuclea, the nature of induction period, autocatalysis effect, equimolar and isobaric periods of reduction, the character of the effect of hydrogen pressure on reduction rate, and the nanocrystalline structure of a reduced metal, were explained in terms of the given approach

\\\\Expert2\\nbo\\Russian Journal of Applied Chemistry\\2010, v. 83, N 5, p.787.pdf
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5.
Инвентарный номер: нет.
   
   M 45

   
    Mechanism of structural networking in hydrogels based on silicon and titanium glycerolates / T. G. Khonina, A. P. Safronov, E. V. Shadrina, M. V. Ivanenko, A. I. Suvorova, O. N. Chupakhin // Journal of Colloid and Intrface Science. - 2012. - Vol. 365, № 1. - С. 81-89
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
HOFMEISTER SERIES -- TITANIUM–GLYCEROL HYDROGELS -- SCHULTZE–HARDY RULE
Аннотация: Formation of organic/inorganic hydrogels based on silicon– and titanium–glycerol precursors synthesized by transesterification of alkoxy derivatives in excess of glycerol was investigated. The precursors in excess of glycerol and obtained gels were studied by chemical and physical methods including gelation kinetics, IR spectroscopy, XRD, dynamic and electrophoretic light scattering, mechanical deformation, which disclosed the basic difference in the gelation mechanism and structure of network in the hydrogels. Due to this difference, the gelation time of silicon– and titanium–glycerol precursors depended on pH or electrolyte addition in an opposite way. In the wide pH range, silicon–glycerol hydrogel was a polymeric single-phase system formed by the polymeric network homogeneously swollen in liquid water/glycerol medium. Flory–Rehner theory applied to the elastic modulus of these gels gave 40–180 monomer base units in the subchains of the network depending on water content in the gel. The mechanism of networking was three-dimensional polycondensation promoted by the electrically charged functional groups attached to the flexible polymeric chains. Electrolyte solutions provided the gelation according to Hofmeister series. Titanium–glycerol hydrogels were heterogeneous colloid systems at pH > 1.5 and single-phase polymeric gels at lower pH. Electrolyte solutions provided the gelation according to Schultze–Hardy rule

\\\\Expert2\\nbo\\Journal of Colloid and Interface Science\\2012, v.365, p.81.pdf
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6.
Инвентарный номер: нет.
   
   M 57

   
    Mercury sorption on a thiocarbamoyl derivative of chitosan [Text] / K. C. Gavilan, A. V. Pestov, H. M. Garcia, Yu. G. Yatluk, J. Roussy, E. Guibal // Journal of Hazardous Materials. - 2009. - Vol. 165, № 1-5. - P415-426
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The grafting of thiourea on chitosan backbone allows synthesizing a thiocarbamoyl derivative that was very efficient for mercury sorption in acidic solutions. Though the sorption capacity is not increased compared to raw chitosan in near neutral solutions, this modification allowed maintaining high sorption capacity (close to 2.3 mmol Hg g-1) at pH 2. Mercury sorption in acidic solutions is not affected by the presence of competitor metals (such as Zn(II), Pb(II), Cu(II), Cd(II), Ni(II)) or the presence of nitrate anions (even at concentration as high as 0.8 M)). The presence of chloride or sulfate anions (0.8 M) decreased Hg(II) sorption capacity to 1 mmol Hg g-1. Kinetics are controlled by a combination of pseudo second-order reaction rate and resistance to intraparticle diffusion. Mercury desorption reached about 75% using thiourea (in HCl solution)

\\\\Expert2\\nbo\\Journal of Hazardous Materials\\2009, v.165.p.415.pdf
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7.
Инвентарный номер: нет.
   
   N 10

   
    N-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions [Text] / L. A. Santos Sorena, M. Ruiz, A. V. Pestov, A. M. Sastre, Yu. G. Yatluk, E. Guibal // Cellulose. - 2011. - Vol. 18, № 2. - P309-325. - Bibliogr. : p. 324-325 (32 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Chitosan was modified by grafting 2-pyridyl-ethyl moieties on the biopolymer backbone for the synthesis of a Platinum Group Metal (PGM) sorbent. The sorbent was tested for Pd(II) and Pt(IV) sorption from HCl solutions. Stable for HCl concentrations below 0.5 M, the sorbent reached sorption capacities as high as 3.2 and 2.6 mmol metal g?1 for Pd(II) and Pt(IV), respectively. Metal sorption mainly proceeds by electrostatic attraction in acidic solutions, though a contribution of complexation mechanism cannot be totally rejected. The resistance to intraparticle diffusion is the main controlling mechanism for uptake kinetics. While agitation speed has a limited effect on kinetics, metal concentration and sorbent dosage have a greater effect on the kinetic profiles. The intraparticle diffusivity varies between 3 ? 10?11 and 4.5 ? 10?10 m2 min?1. Thiourea (combined with HCl solution) is used for Pd(II) and Pt(IV) desorption. The resin could be desorbed and recycled for a minimum of five cycles maintaining high efficiencies of sorption and desorption

\\\\Expert2\\nbo\\Cellulose\\2011, v.18, p. 309.pdf
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8.
Инвентарный номер: нет.
   
   N 10

   
    N-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions / L. A. Santos Sorena, M. Ruiz, A. V. Pestov, A. M. Sastre, Yu. G. Yatluk, E. Guibal // Cellulose. - 2011. - Vol. 18, № 2. - С. 309-325
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CHITOSAN – PYRIDYL GROUPS -- PALLADIUM -- PLATINUM
Аннотация: Chitosan was modified by grafting 2-pyridyl-ethyl moieties on the biopolymer backbone for the synthesis of a Platinum Group Metal (PGM) sorbent. The sorbent was tested for Pd(II) and Pt(IV) sorption from HCl solutions. Stable for HCl concentrations below 0.5 M, the sorbent reached sorption capacities as high as 3.2 and 2.6 mmol metal g?1 for Pd(II) and Pt(IV), respectively. Metal sorption mainly proceeds by electrostatic attraction in acidic solutions, though a contribution of complexation mechanism cannot be totally rejected. The resistance to intraparticle diffusion is the main controlling mechanism for uptake kinetics. While agitation speed has a limited effect on kinetics, metal concentration and sorbent dosage have a greater effect on the kinetic profiles. The intraparticle diffusivity varies between 3 ? 10?11 and 4.5 10?10 m2 min?1. Thiourea (combined with HCl solution) is used for Pd(II) and Pt(IV) desorption. The resin could be desorbed and recycled for a minimum of five cycles maintaining high efficiencies of sorption and desorption. ??

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9.
Инвентарный номер: нет.
   
   N 10

   
    N-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions [] / L. A. Santos Sorena, M. Ruiz, A. V. Pestov, A. M. Sastre, Yu. G. Yatluk, E. Guibal // Cellulose. - 2010. - 6 December. - Online first : рис., табл.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Chitosan was modified by grafting 2-pyridyl-ethyl moieties on the biopolymer backbone for the synthesis of a Platinum Group Metal (PGM) sorbent. The sorbent was tested for Pd(II) and Pt(IV) sorption from HCl solutions. Stable for HCl concentrations below 0.5 M, the sorbent reached sorption capacities as high as 3.2 and 2.6 mmol metal g1 for Pd(II) and Pt(IV), respectively. Metal sorption mainly proceeds by electrostatic attraction in acidic solutions, though a contribution of complexation mechanism cannot be totally rejected. The resistance to intraparticle diffusion is the main controlling mechanism for uptake kinetics. While agitation speed has a limited effect on kinetics, metal concentration and sorbent dosage have a greater effect on the kinetic profiles. The intraparticle diffusivity varies between 3 10?11 and 4.5 1010 m2 min1. Thiourea (combined with HCl solution) is used for Pd(II) and Pt(IV) desorption. The resin could be desorbed and recycled for a minimum of five cycles maintaining high efficiencies of sorption and desorption

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10.
Инвентарный номер: нет.
   
   N 91

   
    Nucleophilic-substitution of halogen in 4-halogenated derivatives of glutamic-acid. 2. Structural effects of arylamine as nucleophile [Electronic resource] / V. P. Krasnov, M. A. Koroleva, N. G. Evstigneeva, I. A. Nizova // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1995. - Vol. 44, № 4. - P635-638
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
GLUTAMIC ACID -- DIASTEREOSELECTIVITY -- NUCLEOPHILIC SUBSTITUTION -- RATE CONSTANT -- ARYLAMINE
Аннотация: Kinetics of nucleophilic substitution of halogen in diastereomeric dimethyl 4-bromo- and 4-iodoglutamates with ortho-, meta-, and para-substituted anilines was studied by HPLC. The threo-diastereomers of the halogenated derivatives react 3-5 times faster than the erythro ones. The structure of the transition state is discussed.

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\1995, 44 (4), 635.pdf
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11.
Инвентарный номер: нет.
   
   P 17

   
    Palladium and platinum sorption on a thiocarbamoyl-derivative of chitosan [Text] / A. Butewicz, K. Campos Galivan, A. V. Pestov, Yu. G. Yatluk, A. W. Trochimczuk, E. Guibal // Journal of Applied Polymer Science . - 2010. - Vol. 116, № 6. - P3318-3330 : рис.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Immobilizing thiourea onto chitosan allowed using the polymer for the recovery of platinum groups metals (PGMs) in acidic solutions (up to 1–2M HCl concentrations). At low HCl concentration protonated amine groups may sorb chloroanionic metal species (electrostatic attraction mechanism); however, most of sorption proceeds through chelation on sulfur containing groups (less sensitive to acidic conditions). The bi-site Langmuir equation was used for fitting sorption isotherms. The sorption of PGMs was weakly affected by the composition of the solution (presence of high concentration of anions and base metals). Maximum sorption capacities for Pd(II) and Pt(IV) ranged between 274 and 330 mg g?1 in 0.25M HCl solutions and decreased to 150–198 mg g?1 in 2M HCl solutions: Pd(II) sorption was systematically higher than Pt(IV) sorption. The pseudo-second rate equation was used for modeling the uptake kinetics. Agitation speed hardly affected uptake kinetics indicating that external diffusion resistance is not the rate controlling step. Desorption yield higher than 85% were obtained using thiourea in 0.1M HCl solution. The adsorbents could be reused for at least three cycles

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12.
Инвентарный номер: нет.
   

   
    Pseudocyclic form of 4-hydroxypyrrolidine-2-carboxanilide podands with trioxyethylene chain: modeling, conformational search, and nmr analysis / O. Borodina, G. Makarov, A. E. Masunov [et al.] // The journal of physical chemistrY A (Dynamics, kinetics, environmental chemistry, spectroscopy, structure, theory). - 2021. - Vol. 125, № 28. - P6029-6041
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The 4-hydroxypyrrolidine-2-carboxanilide podand salt demonstrates catalytic activity in asymmetric Biginelli reaction. The systematic search for prevalent conformational state of the cation was carried out by computer simulations in combination with one- and two-dimensional NMR experiments. For that purpose, we proposed a novel algorithm for the generation and selection of conformers based on molecular dynamics and clustering in the space of principal components. The search had found an important trend of the podand to form a pseudocyclic structure with a horseshoe-shaped conformation of the oligooxyethylene fragment. This conformation is stabilized by different types of intramolecular hydrogen bonds between the acidic and basic centers of the two 4-hydroxypyrrolidine-2-carboxanilide residuals (branches). The proposed approach had made it possible to identify the major structural factors, providing a correlation between the calculated and experimental chemical shifts of hydrogen atoms in the 1H NMR spectra of the protonated podand.

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13.
Инвентарный номер: нет.
   
   R 32

   
    Redox conversions of 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4triazolo[1,5-a]pyrimidinide l-arginine monohydrate as a promising antiviral drug / A. V. Ivoilova, A. N. Tsmokalyuk, P. N. Mozharovskaia [et al.] // Molecules. - 2021. - Т. 26, № 16. - Ст. 5087
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
NITRO-1,2,4-TRIAZOLO[1,5A]PYRIMIDINES -- TRIAZID -- NITRO GROUP TRANSFORMATIONS -- NITROAROMATIC COMPOUNDS
Аннотация: This article presents the results of a study of electrochemical transformations in aqueous and aprotic media of 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidinide l-arginine monohydrate (1a, Triazid) obtained by electrochemical methods and ESR spectroscopy. The effect of pH on the current and the reduction potential of 1a in an aqueous Britton–Robinson buffer solution was studied. It was found that 1a is irreversibly reduced in aqueous acidic media on a glassy carbon electrode in one stage with the participation of six electrons and the formation of 5-methyl-6-amino-7-oxo-1,2,4-triazolo[1,5-a]pyrimidin. The electroreduction of 1a in DMF on a background of tetrabutylammonium salts proceeds in two stages, controlled by the kinetics of second-order reactions. In the first stage, the reduction of 1a is accompanied by protonation by the initial compound of the basic intermediate products formed in the electrode reaction (self-protonation mechanism). The second quasi-reversible stage of the electroreduction 1a corresponds to the formation of a dianion radical upon the reduction of the heterocyclic anion 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidin, which is formed upon the potentials of the first peak. The ESR spectrum of the radical dianion was recorded upon electroreduction of Triazid in the presence of Bu4NOH. The effect of the formation of ion pairs on the reversibility of the second peak of the 1a transformation is shown. A change in the rate and regioselectivity of the protonation of the dianion radical in the presence of Na+ and Li+ ions is assumed. The results of studying the electroreduction of 1a by ESR spectroscopy with a TEMPO trap make it possible to assume the simultaneous formation of both a nitroxyl radical and a radical with the spin density localized on the nitrogen at the 4 position of the six-membered ring

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14.
Инвентарный номер: нет.
   

   
    Sorbents with a taurine function: kinetics of interaction with singly and doubly charged metal ions in ammonium acetate buffer solution / Yu. S. Petrova, L. M. Alifkhanova, K. Ya. Kuznetsova [et al.] // Russian journal of inorganic chemistry. - 2022. - Vol. 67, № 7. - P1080-1087
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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15.
Инвентарный номер: нет.
   
   S 83

   
    Stereoselective cyclization of alkyl N-phthaloyl-4-bromoglutamates to cyclopropane derivatives [Electronic resource] / V. P. Krasnov, M. A. Koroleva, T. V. Matveeva, E. A. Zhdanova, A. N. Grishakov, N. A. Klyuev // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2001. - Vol. 50, № 4. - P644-648. - Bibliogr. : p. 648 (17 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CYCLIZATION -- CYCLOPROPANE-1,2-DICARBOXYLIC ACID -- GLUTAMIC ACID -- TRANSESTERIFICATION
Аннотация: The kinetics of the reactions of alkyl N-phthaloyl-4-bromoglutamates with Et3N and KOH was investigated. The reactions proceed stercospecifically to form alkyl 1-phthalimido-cyclopropane-r-1-2-dicarboxylates. In alcohols, the reactions are accompanied by transesterification. The concerted mechanism accounting for the stereospecificity of these reactions is proposed.

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2001, 50 (4), 644.pdf
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16.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis and properties of epoxy-anhydride polymers modified with polyfluorolakyl-substituted oxiranes in the course of curing [Electronic resource] / M. S. Fedoseev, L. F. Derzhavinskaya, V. I. Karmanov, D. N. Bazhin, A. Ya. Zapevalov, T. I. Gorbunova, V. I. Saloutin // Russian Journal of Applied Chemistry. - 2010. - Vol. 83, № 4. - P723-727 : табл., граф. - Bibliogr. : p. 723-727 (24 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
POLYMERS -- EPOXY-ANHYDRIDE POLYMERS -- OXIRANES -- POLYFLUOROLAKYL-SUBSTITUTED OXIRANES -- CURING
Аннотация: Epoxy-anhydride polymers based on N,N,O-triglycidyl-p-aminophenol and isomethyltetrahydrophthalic anhydride were synthesized in the presence of new active modifiers, polyfluoroalkyl glycidyl ethers. The kinetics of the reactions of the modifiers with the anhydride were studied by differential scanning calorimetry and IR spectroscopy. The physicomechanical characteristics, glass transition points, and water absorption of the polymers were determined.

\\\\Expert2\\nbo\\Russian Journal of Applied Chemistry\\2010, v. 83, N 4, p.723-727.pdf
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  ч/з - Главный читальный зал

  эр - Зал электронных ресурсов

  

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