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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Reaction kinetics and catalysis letters 10 (1979), S. 347-351 
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Методом ЭПР спектроскопии исследован порошок MgO, активированный в вакууме при 400°C, и пропитанныи нитробензолом. Было установлено, что образование центров mn4+ является результатом перехода электронов между нитробензолом и центрами примеси. По сравнению с методом парофазного контакта катализатора с нитробензолом, жидкофазное пропитывание дает гораздо меньшую концентрацию радикала-аниона нитробензола.
    Notes: Abstract MgO powders activated in vacuo at 400°C and impregnated with nitrobenzene were investigated by ESR spectroscopy. The formation of Mn4+ centers due to electron transfer between nitrobenzene and impurity centers was established. Liquid impregnation yields substantially fewer nitrobenzene anion radicals than vapor-contact between the catalyst and nitrobenzene.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 5 (1973), S. 407-414 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a mis au point une méthode d'analyse cinétique des courbes thermogravimétriques en plusieurs termes pour séparer les étapes de décomposition qui se chevauchent et déterminer pour chacune d'elles l'ordre de réaction, l'énergie d'activation et la perte de poids. On a utilisé cette méthode dans trois cas: a) pour distinguer l'évaporation de la décomposition du copolymère isobutène-butadiène, b) pour étudier l'influence des conditions de séchage sur la teneur en substances volatiles d'une résine styrène-indène, c) pour distinguer la déchlorhydratation du chlorure de polyvinyle de la décomposition du cycle.
    Abstract: Zusammenfassung Eine kinetische Analyse von mehrstufigen thermogravimetrischen Kurven wurde entwickelt, um überlappende Zersetzungsstufen zu trennen, ihre individuellen Reaktionsordnungen, Aktivierungsenergien und Gewichtsverluste zu bestimmen. Die Methode wurde in drei Fällen eingesetzt: (a) Trennung der Verdampfung des Isobuten-Butadien-Kopolymers von der Zersetzung; (b) die Wirkung der Trocknungsbedingungen auf den Gehalt an flüchtigen Substanzen eines Styrol-Inden-Harzes; (c) Trennung der Dehydrochlorierung des Poly-Vinylchlorids von der Ringspaltung.
    Notes: Abstract A kinetic analysis of multi-step thermogravimetric curves was developed for separation of overlapping decomposition steps to determine their individual reaction order, activation energy and weight loss. The method was applied in three instances: (a) separation of evaporation from decomposition for an isobutene-butadiene copolymer; (b) effects of drying conditions on the volatile content of a styrene-indene resin; (c) separation of dehydrochlorination from cyclodecomposition of poly(vinyl chloride).
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 3111-3118 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The contribution of different MgO supports to the coordination polymerization of ethylene was studied by x-ray diffractometry and infrared (IR) and electron spin resonance (ESR) spectroscopy of the supports and their products after treatment with TiCl4. It was concluded that TiCl4 was bonded on the surface OH groups of MgO mainly in inactive form, whereas the majority of the active sites was associated with the coordinatively unsaturated O2- ions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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