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  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 18 (1980), S. 29-34 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a corrigé l'erreur mathématique de la méthode proposée par Bae pour la détermination des paramètres cinétiques à partir des courbes d'ATD. L'équation proposée ne contient pas de constantes thermiques relatives à l'appareil et peut être appliquée aux courbes d'ATD par une méthode itérative. Les résultats obtenus en appliquant cette équation aux courbes d'ATD expérimentales pour la décomposition du bicarbonate de sodium sont en bon accord avec ceux obtenus à partir de mesures isothermes, même si le porte-échantillon de l'appareil d'ATD est du type coupelle isolée au lieu du type bloc recommandé par Bae.
    Abstract: Zusammenfassung Der mathematische Fehler der von Bae zur Bestimmung kinetischer Parameter aus DTA-Kurven vorgeschlagenen Methode wurde korrigiert. Die vorgeschlagene Gleichung enthält keine thermischen Konstanten der Geräte und kann für DTA-Kurven durch eine iterative Methode angewandt werden. Die durch Anwendung dieser Gleichung bei experimentellen DTA-Kurven der Zersetzung von Natriumbicarbonat erhaltenen Ergebnisse sind mit den aus isothermen Messungen erhaltenen gut vergleichbar, selbst wenn die DTA-Probenbehälter-Zusammenstellung dem isolierten Bächertyp und nicht dem von Bae empfohlenen Blocktyp entsprach.
    Notes: Abstract The mathematical error in the method proposed by Bae for the determination of kinetic parameters from DTA curves has been corrected. The proposed equation does not contain thermal constants of the apparatus, and can be applied to DTA curves by an iterative method. The results obtained by the application of this equation to experimental DTA curves for the decomposition of sodium bicarbonate compared well with those from isothermal measurements, even when the DTA sample holder assembly was of the isolated cup-type instead of the block-type assembly recommended by Bae.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 2133-2144 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Styrene was found to yield saturated and unsaturated linear oligomers in the presence of a surface-supported catalyst, molybdenum oxide on silica-alumina. The reaction rates, the structure, and the molecular weight distribution of the products were found to be controlled by the choice of the solvent. Higher-molecular-weight fractions were favored in isooctane, whereas low-molecular-weight oligomers were preferred in dioxane. The reaction followed first-order kinetics with respect to the monomer. End-group analysis suggests a probable cationic mechanism. Approximate transfer constants KtrKp were deduced from product distribution data. The behavior of the surface-supported catalyst was compared with other cationic catalyst systems.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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