Центральная Научная Библиотека УрО РАН

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   П 26

    Первова, М. Г.
    Определение хлоруксусных кислот в питьевой воде методом реакционной газожидкостной хроматографии [] = Determination of Chloroacetic Acids in Drinking Water by Reaction Gas Chromatography / М. Г. Первова, В. Е. Кириченко, К. И. Пашкевич // Журнал аналитической химии. - 2002. - Т. 57, N 4. - 388-392: схем. - Библиогр. : с. 391-392 (20 назв.) . - ISSN 0044-4502

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Разработана методика определения хлорированных уксусных кислот в питьевой воде, основанная на извлечении методом твердофазной экстракции, переведении хлоруксусных кислот в их трифторэтиловые эфиры, разделении и определении методом газожидкостной хроматографии с электронозахватным детектором. Оптимизированы условия проведения реакции этерификации. Методика применена для анализа образцов питьевой воды

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   К 29


    Каталитическая активность дендритных осадков серебра, полученных электролизом из водного раствора и нитратного расплава [] = Catalytical activity of the dendrite precipitates of silver obtained by electrolysis from water solution and nitrate melt / С. Л. Хохлов, Л. А. Петров, И. Б. Мурашова, И. В. Зотин, А. П. Храмов // Расплавы. - 2003. - N 2. - 61-67: табл., фот. - Библиогр. : с. 67 (7 назв.) . - ISSN 0235-0106

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Разработан способ приготовления катализаторов парциального окислительного дегидрирования спиртов на основе электролитического серебряного порошка, полученного из водного раствора, а также - на основе дендритных волокон серебра, осажденных из нитратного расплава. На примере синтеза глиоксаля из этиленгликоля проведено сравнение параметров каталитической активности новых катализаторов. Наиболее активным в процессах окисления оказался образец, для приготовления которого были использованы волокнистые осадки серебра, полученные из расплава. При этом самое высокое содержание глиоксаля в растворе и самую малую концентрацию остаточного этиленгликоля обеспечивают катализаторы на основе дендритов серебра, осажденных из водного раствора. Показатели новых серебряных катализаторов превышают данные технической характеристики стандартного промышленного катализатора марки Д53М

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   О-62


    Определение карбонильных соединений в питьевой воде методом газовой хроматографии в виде пентафторфенилгидразонов [] = The determination of carbonyls compounds in drinking water by pentafluorophenylhidrazine derivatization and gas chromatography / В. Е. Кириченко, М. Г. Первова, Д. Л. Чижов, А. С. Назаров // Аналитика и контроль. - 2003. - Т. 7, N 3. - 248-255: табл., граф. - Библиогр. : с. 254-255 (33 назв.)

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Предложена методика определения карбонильных соединений в водных средах, сочетающая перевод их в пентафторфенилгидразоны, экстракцию толуолом и газохроматографический анализ с электронозахватным детектором. Проведено масс-спектрометрическое исследование пентафторфенилгидразонов альдегидов и кетонов

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    (E)-1,1,1-trifluoro-4-phenyl-but-2-ene-4-one and trimethyl phosphite [Text] / V. G. Ratner, E. Lork, K. I. Pashkevich, G. -V. Roeschenthaler // Journal of Fluorine Chemistry. - 2000. - Vol. 102, № 1-2. - P73-77

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The interaction of (E)-1,1,1-trifluoro-4-phenyl-but-2-ene-4-one (1) with trimethyl phosphite affords in a [4 + 1] cycloaddition the 1,2?5-oxaphospholene 2 as a sole product which upon hydrolysis is transformed into the fluoroalkyl containing ?-ketophosphonate 4. When the reaction is carried out in the presence of small mounts of water, in addition to 2 as a main product, the phosphoric acid ester 6 of the enolic dimer of ketone 1 is also formed. The molecular structure of compound 6 (monoclinic P 2(1)/c with a = 2088.60(2), b = 1403.1(3), c = 1613.8(1) pm, ? = 90, ? = 100.97(1), ? = 90°, Z = 8) was determined, indicating two independent molecules with (RR) and (SS) configuration and disordered CF3 groups.????

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   C 74


    Complexation models of N-(2-carboxyethyl)chitosans with copper(II) ions [Text] / Yu. A. Skorik, C. A. R. Gomes, N. V. Podberezskaya, G. V. Romanenko, L. F. Pinto, Yu. G. Yatluk // Biomacromolecules. - 2005. - Vol. 6, № 1. - P189-195 . - ISSN 1525-7797

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The copper(II) complex formation equilibria of N-(2-carboxyethyl)chitosans with three different degrees of substitution (DS = 0.42, 0.92, and 1.61) were studied in aqueous solution by pH-potentiometric and UV-spectrophotometric techniques. It was demonstrated that the complexation model of CE-chitosans depends on DS: the [Cu(Glc-NR2)2] complexes are predominant for two lower substituted samples ("bridge model", log ?12 = 10.06 and 11.6, respectively), whereas the increase of DS leads to formation mainly of the [Cu(Glc-NR2)] complexes ("pendant model", log ?11 = 6.41). As a model for copper complexation with a disubstituted residue of CE-chitosan, the complex of N-methyliminodipropionate [CuMidp(H2O)]·(H2O) was synthesized and structurally characterized by XRD. The unit cell consists of two crystallographically nonequivalent Cu atoms having slightly distorted square pyramidal coordination; Midp constitutes the basal plane of the pyramid and acts as a tetradentate NO3 chelate-bridging ligand by the formation of two six-membered chelate rings (average Cu-O 1.99 A, Cu-N 2.04 A) and a bridge via carbonyl O atom (average Cu-O 1.99 A), an apical position is occupied by a water molecule (average Cu-Ow 2.30 A).

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   P 93

    Prokhorov, A. M.
    CuCl2 induced reactions of 6-ethynyl- and 6-cyano-5-aryl-2,2-bipyridines with various N- and O-nucleophiles in comparison with the reactions of relative 1,2,4-triazines [Text] / A. M. Prokhorov, P. A. Slepukhin, D. N. Kozhevnikov // Journal of Organometallic Chemistry. - 2008. - Vol. 693, № 10. - P1886-1894

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Meanwhile 5-aryl-6-cyano-2,2-bipyridines are very stable towards various nucleophiles, addition copper(II) chloride to the reactional mixture facilitates nucleophilic addition to the cyano group dramatically. The cyanobipyridines react easily with water, methanol, ethanolamine in the presence of CuCl2 yielding well-crystallized complexes containing carboxylates, carboximidates or carboxamidines as ligands. 5-Cyano-1,2,4-triazines are more active in the reactions due to higher electron-withdrawing properties of this heterocycle. Due to the same reason acetylene moiety of 5-ethynyl-3-pyridyl-1,2,4-triazine adds water quite easily but in the presence of copper chloride as well

\\\\Expert2\\nbo\\Journal of Organometallic Chemistry\\2008, v.693, p.1886.pdf
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   H 43


    Heavy metals removal by flocculation/precipitation using N-(2-carboxyethyl)chitosans [Text] / S. YU. Bratskaya, A. V. Pestov, Yu. G. Yatluk, V. A. Avramenko // Colloids and Surfaces A: Physicochemical and Engineering Aspects. - 2009. - Vol. 339, № 1-3. - P140-144

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Here we report on solution properties and flocculation performance of polyampholyte chitosan derivatives - N-carboxyethylated chitosans (CEC) - synthesized "in gel" by treatment of chitosan with acrylic acid. We show that carboxyethylation with the substitution degrees (DS) from 0.7 to 1.6 yields water-soluble derivatives, whose isoelectric points (IEP) range from 6.30 to 3.55. At pH 7.5 interaction of negatively charged CEC derivatives with positively charged colloids of the heavy metal hydroxides (Zn2+, Cu2+, Ni2+), serving as a model of postgalvanic wastewaters, results in lowering of electrokinetic potential of the hydroxide colloids and their precipitation at appropriate flocculant dose. Investigations of CEC flocculation performance depending on pH and DS show that the efficiency of metal removal decreases in the row Cu2+ Zn2+ Ni2+ corresponding to the row of the hydroxocomplex stability for these metals. The higher was pH of the system and DS of CEC derivative, the narrower was the flocculation window and the stronger was negative effect of flocculant overdosing on the efficiency of heavy metal removal. Based on the estimation of floc settling rates and the residual metal concentrations, we have concluded that the optimal DS of CEC derivatives for the precipitation of metal hydroxides is 0.7-1.0

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   R 35


    Regioselective solvent-sensitive reactions of 6-(trifluoromethyl)comanic acid and its derivatives with phenylhydrazine [Text] / B. I. Usachev, D. L. Obydennov, M. I. Kodess, V. Ya. Sosnovskikh // Tetrahedron Letters. - 2009. - Vol. 50, № 31. - P4446-4448

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: 6-(Trifluoromethyl)comanic acid reacts regioselectively with phenylhydrazine in water to give 5-[3,3,3-trifluoro-2-(phenylhydrazono)propyl]-1-phenyl-1H-pyrazole-3-carboxylic acid. Similar reaction in dioxane leads to 3-[3,3,3-trifluoro-2-(phenylhydrazono)propyl]-1-phenyl-1H-pyrazole-5-carboxylic acid. A strong solvent influence on the reaction route was also found for 6-(trifluoromethyl)comanic acid derivatives

\\\\Expert2\\nbo\\Tetrahedron Letters\\2009, v. 50, p.4446.pdf
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   Л 94


    Люминесцентные свойства некоторых n-арил-з-аминопропионовых кислот и их применение для определения меди(II) в питьевой и сточной воде = Luminiscent Properties of Several N-Aryl-3-Aminopropionic Acids and Their Application for Determination of Copper(II) in Drinking and Waste Water_ [] / Н. В. Печищева, Е. В. Осинцева, Л. К. Неудачина, Ю. Г. Ятлук, Л. И. Леонтьев, К. Ю. Шуняев, А. А. Вшивков // Докл. АН. - 2006. - Т. 408, № 2. - С. 199-203. - Библиогр.: с. 203 (10 назв.)

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Рубрики: ХИМИЧЕСКИЕ НАУКИ

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10.

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   T 44


    The first cubane-like complex of copper based on N -carboxyethyl-tris(hydroxymethyl)aminomethane: Synthesis and crystal structure [Electronic resource] / A. V. Pestov, A. V. Virovets, N. V. Podberezskaya, Yu. G. Yatluk // Russian Journal of Coordination Chemistry. - 2008. - Vol. 34, № 1. - P1-7. - Bibliogr. : p. 7 (9 ref.)

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The interaction of acrylic acid with tris(hydroxymethyl)aminomethane (I) was studied. A simple method was suggested for preparing N-carboxyethyl-tris(hydroxymethyl)aminomethane (homotricin) (II). On the basis of compound II, the 1:1 Cu complex, [Cu(OCH2C(CH2OH)2NHCH2CH2COO)]4·nH2O (n = 4–11.25) (III), which is alkoxycarboxylate, was synthesized. The crystal structure of III was found to correspond to a cubane-like tetranuclear cluster (an automated Bruker X8Apex diffractometer with CCD detector (MoK radiation, graphite monochromator, v = 1.11°-27.5°), 8016 reflections, space group P , a = 12.5573(3), b = 19.1012(4), c = 21.2903(5) A, a = 80.7770(10)°, beta = 75.7430(10)°, y = 75.2260(10)°, V = 4761.62(19) A3, p(calcd.) = 1.704 g/cm3, Z = 4). The crystals are unstable due to the large number of water molecules

\\\\Expert2\\nbo\\Russian Journal of Coordination Chemistry\\2008, v. 34, N. 1, p.1.pdf
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11.

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   L 96


    Luminescence properties of some N-aryl-3-aminopropionic acids and their use for determination of copper(II) in drinking and waste water [Text] / N. V. Pechishcheva, E. V. Osintseva, L. K. Neudachina, L. I. Leontev, Yu. G. Yatluk, K. Yu. Shunyaev, A. A. Vshivkov // Doklady Chemistry. - 2006. - Vol. 408, № 1. - P65-69

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Рубрики: ХИМИЧЕСКИЕ НАУКИ

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12.

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   T 44


    The epithermal gold-telluride Kochbulak deposit (Uzbekistan) [Text] / V. A. Kovalenker, Yu. G. Safonov, V. B. Naumov, V. L. Rusinov // Geology of Ore Deposits. - 1997. - Vol. 39, № 2. - P107-128. - Bibliogr. : p. 128 (42 ref.)

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
DEPOSIT -- EPITHERMAL GOLD-TELLURIDE KOCHBULAK DEPOSIT -- KOCHBULAK DEPOSIT -- VOLCANIC SEQUENCE -- PORPHYRY DIKES
Аннотация: The Paleozoic epithermal gold-telluride Kochbulak deposit is situated on the northern slope of the Kurama Range in the central Tien Shan (Uzbekistan). The deposit is located within an andesite-dacite volcanic sequence (C2-3) intruded by subalkaline granodiorite and granosyenite porphyry dikes (C3-P1). The ore-forming system of the deposit originated and evolved during the orogenic uplift associated with aerial volcanism and emplacement of porphyritic granitoids. The Kochbulak deposit contains a great diversity of ore-forming sulfides, sulphosalts, tellurides, and selenides, several of which were first found there. The deposit has features of epithermal mineralization of both the adularia-sericite and acid-sulfate genetic types and mesothermal gold mineralization. The deposit consists of high- and low-angle veins and ore-bearing breccia pipes. The pipe-shaped bodies and veins differ in ore, gangue, and metasomatic mineral assemblages. The ore bodies hosted by explosive-hydrothermal breccias contain goldfieldite, famatinite, luzonite, enargite, diaspore, and pyrophyllite and, therefore, have pronounced features of epithermal mineralization of the acid-sulfate type. The ore veins show evidence of deeper formation and are associated with quartz-carbonate-sericite wall rock alteration. Our study of mineral assemblages, fluid inclusions, sulfur, oxygen, and hydrogen isotopes, and thermodynamic calculations show that the Kochbulak deposit was formed during a cyclic multistage process with periodic alternation of sealing along with tectonic and explosive opening of the fluid channel ways. The ore-forming process is subdivided into the preore, I to III ore, and postore stages related to fracture opening. Three types of solutions took part in the formation of gold-sulfide-sulphosalt-telluride mineralization. They were distinct in temperature, composition, salinity, and proportion of meteoric and magmatic water and other volatile components. The temperature generally decreased from 465°C to <100°C, and slightly increased at the beginning of each stage of the ore-forming process. Pressure, salinity, ion and gas composition of solutions, and the oxygen isotope composition of water varied as well. The deposition of gold-productive mineral assemblages was caused by changes in pH, Eh, activities of S2, O2, and Te2. The recurrence of these changes and repeated mineral deposition within the same depth intervals formed bodies very rich in ore components. The above-mentioned data suggest the Kochbulak deposit represents a particular type of gold-telluride mineralization, which originated within a wide range of physicochemical conditions at hypabyssal to subsurface depths.????

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13.

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   R 44


    Replacement of dimethylpyrazolyl group in 1,2,4,5-tetrazines by aliphatic alcohols and water [Electronic resource] / R. I. Ishmetova, N. I. Latosh, I. N. Ganebnuikh, N. K. Ignatenko, S. G. Tolshchina, G. L. Rusinov // Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2009. - Vol. 45, № 7. - P1102-1107

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Reactions of 3,6-bis(4-R-3,5-dimethyl-1H-pyrazol-1-yl)-1,2,4,5-tetrazines and 3-amino-6-(3,5-dimethyl-1H-pyrazol-1-yl)-1,2,4,5-tetrazines with aliphatic alcohols and water in the presence of a base involved replacement of the dimethylpyrazolyl group and resulted in the formation of mono- and dialkoxy-1,2,4,5-tetrazines and 6-substituted 3-hydroxy-1,2,4,5-tetrazines. Dissociation constants of the latter were determined by potentiometric titration.

\\\\Expert2\\nbo\\Russian Journal of Organic Chemistry\\2009, 45 (7), 1102.pdf
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14.

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   S 10


    S-N(H) reactions of pyrazine N-oxides and 1,2,4-triazine 4-oxides with CH-active compounds [Electronic resource] / D. N. Kozhevnikov, I. S. Kovalev, A. M. Prokhorov, V. L. Rusinov, O. N. Chupakhin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2003. - Vol. 52, № 7. - P1588-1594

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Nucleophilic substitution of hydrogen in pyrazine N-oxides under the action of CH-active compounds requires activation with acylating agents. This activation facilitates aromatization of intermediate H adducts via elimination of the acid residue to form substituted pyrazines. More electrophilic 1,2,4-triazine 4-oxides react with carbanions derived from CH-active compounds without additional activation according to a scheme, which has previously been unknown for azine N-oxides. This scheme involves aromatization of H adducts through elimination of water by the E1cb mechanism. The reaction products occur in DMSO-d6 solutions predominantly as 6-methylene-1,6-dihydropyrazines and 5-methylene-4,5-dihydro-1,2,4-triazines.??nucleophilic substitution of hydrogen - 1,2,4-triazine 4-oxide - pyrazine 1-oxide - carbanion - CH-active compounds??

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2003, 52 (7), 1588.pdf
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15.

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.)

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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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16.

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   P 48

    Pervova, M. G.
    Determination of 1,2,3-benzotriazole in aqueous solutions and air by reaction-gas-liquid chromatography [Electronic resource] / M. G. Pervova, V. E. Kirichenko, V. I. Saloutin // Journal of Analytical Chemistry. - 2010. - Vol. 65, № 3. - P276-279 : табл., граф. - Bibliogr. : p. 279 (18 ref.)

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
BENZOTRIAZOLE -- AQUEOUS SOLUTIONS -- AIR -- CHROMATOGRAPHY -- REACTION-GAS-LIQUID CHROMATOGRAPHY
Аннотация: A procedure is developed for the gas-chromatographic determination of 1,2,3-benzotriazole including preliminary derivatization with acetic anhydride in an aqueous solution followed by the extraction the derivative with toluene. The procedure is applied to the analysis of water samples, process solutions for treating metals, air of the working zone, and industrial emissions. Determination limits in water media are 0.01 mg/L and in the air of the working zone, 0.1 mg/m3.

\\\\Expert2\\nbo\\Journal of Analytical Chemistry\\2010, V. 65, N 3, p. 276-279.pdf
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17.

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   P 48

    Pervova, M. G.
    Determination of Chloroacetic Acids in Drinking Water by Reaction Gas Chromatography [Electronic resource] / M. G. Pervova, V. E. Kirichenko, K. I. Pashkevich // Journal of Analytical Chemistry. - 2002. - Vol. 57, № 4. - P326-330. - Bibliogr. : p. 330 (20 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A procedure was developed for determining chloroacetic acids in drinking water. The procedure is based on solid-phase extraction followed by the conversion of chloroacetic acids to trifluoroacetic esters and their separation and determination by gas–liquid chromatography with an electron capture detector. Esterification conditions were optimized. The procedure was used for analyzing samples of drinking water

\\\\Expert2\\nbo\\Journal of Analytical Chemistry\\2002, V. 57, N 4, p. 326.pdf
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18.

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

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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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19.

Инвентарный номер: нет.

   C 31


    Catalyst-free transformations of diethyl 2-ethoxymethylenemalonate and diethyl polyfluorobenzoylmalonates in water / D. N. Bazhin, Yu. S. Kudyakova, Ya. V. Burgart, V. I. Saloutin // Tetrahedron Letters. - 2012. - Vol. 53, №15. - С. 1961-1963

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
1,3,5-BENZENETRICARBOXYLATE -- WATER -- POLYFLUOROBENZOYLMALONATES
Аннотация: The unusual transformation of diethyl 2-ethoxymethylenemalonate into triethyl 1,3,5-benzenetricarboxylate is described. This one-pot reaction proceeds in water without any catalyst in a good yield. One of the proposed intermediates of this process is also used under similar conditions to give the desired trisubstituted benzene. A catalyst-free, efficient, practical, and convenient process in water based on deethoxycarbonylation has been developed to form ethyl polyfluorobenzoylacetates in a high yield from diethyl polyfluorobenzoylmalonates

\\\\Expert2\\nbo\\Tetrahedron Letters\\2012, v. 53, p. 1961.pdf
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20.

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   T 44


    Thermal stability of new sorption materials based on polysiloxanes / L. K. Neudachina, A. Y. Golub, E. M. Gorbunova, Yu. G. Yatluk // Glass Physics and Chemistry. - 2011. - Vol.37, №6. - С. 603-612

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
THERMAL STABILITY -- THIOCARBAMOYLATED POLYSILOXANES -- SILOXANE MATRIX
Аннотация: The thermal stability of the unmodified, aminated, and thiocarbamoylated polysiloxanes has been studied. The siloxane matrix is stable in the temperature range up to 800°C. For the first time, mass spectrometry has been applied to the analysis of the composition of the gaseous products of thermal decomposition of the studied polysiloxanes. It has been shown that, in the process of thermal decomposition, the terminal functional groups are detached and oxidized. Water, ammonia, nitrogen, carbon, and sulfur (in the case of thiourea-modified sorbent) oxides are formed predominantly. The quantitative removal of functional groups during heating up to 800°C has been confirmed by IR spectroscopy. A mechanism of thermal decomposition of polysiloxane xerogels has been proposed. It has been found that adsorption of platinum increases the thermal stability of the samples

\\\\Expert2\\nbo\\Glass Physics and Chemistry\\2011, V. 37, N 6, P.603-612.pdf
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