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  • 1
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Steroid Biochemistry 30 (1988), S. 251-255 
    ISSN: 0022-4731
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0022-4731
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 32 (1987), S. 883-891 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Muttersubstanz, Aramoniumpermanganat, wurde in Luft bei 120° vorsichtig zersetzt. Das dabei erhaltene Ausgangsmaterial (SM) wurde danach in Luft 5 Stunden im Temperaturbereich von 150–1200° thermisch behandelt. Die chemische Analyse von SM ergab, daß als Hauptprodukt der Zersetzung von NH4MnO4, Mn2O3 auftritt neben MnO2, NH4NO3, H2O und O2. Die Bildung von Mn3O4 beginnt bei 900°. Aus Infrarotspektren verschiedener Kalzinierungsprodukte ist ersichtlich, daß in der Gitterstruktur NH 4 + bis 300° zurückgehalten wird und überschüssiger Sauerstoff in Form von koordiniertem O2 vorliegt. Die Ergebnisse der TG-, DTA- und IRA-Untersuchungen von SM bestätigen Daten der chemischen Analyse. Mittels Röntgenanalyse wurden die Phasen identifiziert und der Verlauf der Phasenübergänge und der Bildung einer festen Lösung zwischen MnO2 und Mn2O3 verfolgt.
    Abstract: Резюме Первоначально перма нганат аммония подвергали осторожн ому разложению на воздухе при 120°. Получае мый при этом продукт, называемый как исход ное вещество, подвергался затем в т ечении 5 часов термиче ской обработке на воздухе в интервале температ ур 150–1200°. Химический анали з показал, что главным продуктом разложени я являлась окись трехвалентного марг анца, наряду с двуокис ью марганца, нитратом аммония, вод ой и кислородом. При темпе ратуре 900° начиналось образование Mn3O4. ИК спе ктры различных продуктов прокалива ния показали удержив ание до 300° аммонний-иона в решет ке и присутствие кислорода в форме O 2 − . Д анные ТГ, ДТА и ИК спектроскопии подтв ердили результаты химического анализа. Рентгеноструктурны й анализ был использован для иден тификации фаз, исследования превра щений и образования т вердого раствора между двуок исью марганца и окисью трехвалентно го марганца.
    Notes: Abstract The parent material, ammonium permanganate, was carefully decomposed in air at 120°. The product, referred to as the starting material (SM), was then subjected to thermal treatment in air for 5 hr in the temperature range 150–1200°. Chemical analysis of SM indicated that the main decomposition product of NH4MnO4 was Mn2O3, together with MnO2, NH4NO3, H2O and O2. Mn3O4 started to form at 900°. The infrared spectra of various calcination products revealed the retention of NH 4 + in the lattice structure up to 300°, and reflected the presence of excess oxygen as coordinated O 2 − . The TG, DTA and IRA results on SM supported the chemical analysis data. X-ray analysis was carried out for phase identification and to follow transformations and the formation of a solid solution between MnO2 and Mn2O3.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 5 (1986), S. 662-664 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 23 (1988), S. 4345-4348 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The d.c. conductivity, a.c. conductivity and thermoelectric power of the compounds H3N+(CH2)+ NH3FeCl4, wheren=2, 3, 7 and 10, have been studied over a temperature range of 150–500 K. The conductivity results confirm the presence of more than one structural phase transition for each compound investigated. The thermoelectric power measurements showed that electrons are the main charge carriers in all crystal phases. The conductivity results were explained on the basis of an electron hopping mechanism over the whole temperature range.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 465-469 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polymerization of Ethylene with Vanadium(III)amideBy addition of AlEt3, AlEt2Cl or AlEtCl2 to V(NPh2)3 · THF · 0,5 Dx. the polymerization of ethylene under normal conditions is started with increasing rate. The influence of the concentration of the catalyst components, the monomer concentration and the ageing time of the catalytic system on the rate is studied.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 41 (1990), S. 2021-2030 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The heterogenous polymerization of methyl methacrylate in the presence of cuprous oxide was studied. Adsorption measurements of stearic acid from benzene solution onto the surface of Cu2O were carried out. The specific surface area of cuprous oxide as obtained from the extrapolation to the concentration of monolayer surface coverage in the adsorption isotherm was compared with that evaluated from the BET-equation. Sedimentation volume and sedimentation rate of the variably surface modified Cu2O samples were determined. It was found that the surface modification of Cu2O enhances its catalytic effect in the heterogenous polymerization of methyl methacrylate up to monolayer surface coverage. The viscosity average molecular weights M̄v of the respective polymers as well as the apparent activation energy of the polymerization process were correlated with the reaction parameters.
    Additional Material: 7 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 678-679 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 411-413 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The copolymerization of ethylene and propylene at constant ratio of monomer concentration with the catalytic system V(NPh2)3 · THF · dioxane and ethyl aluminium dichloride at normal pressure was studied. The influence of the mole ratio of the aluminium to the vanadium compound on the overall- rate of copolymerization, the composition and the solution viscosity of the copolymers was determined. Based on the results obtained the reactivity of the active centres is discussed.
    Notes: Die Copolymerisation von Ethylen und Propylen bei konstantem Konzentrationsverhältnis der Monomere wurde mit dem Katalysatorsystem V(NPh2)3. Tetrahydrofuran. Dioxan und Ethyl- aluminium- dichlorid bei Normaldruck untersucht. Der Einfluß des Molverhältnisses der Aluminium- zur Vanadiumverbindung auf die Bruttopolymerisations- geschwindigkeit der Copolymerisation und auf die Zusammensetzung und die Lösungsviskosität der Copolymere wurde bestimmt. Anhand der gewonnenen Ergebnisse wird die Reaktivität der gebildeten polymerisationsaktiven Zentren diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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