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  • 1
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mittels TG-DTG-, DSC-, DTA- und IR-Techniken wurden einschließlich Mechanismus die thermischen Dissoziationsreaktionen von Komplexen der Seltenerden(III)nitrate mit dem Titelkronenether untersucht. Die Ergebnisse zeigen, daß die Dissoziationsvorgänge der Komplexe aus mehreren Schritten bestehen, von denen einer eine schnelle Zerfallsreaktion ist. Die Peaktemperaturen für die schnellen Zersetzungen (DSC) aller Lanthanidenkomplexe (ausgenommen Pm und Tm) sinken mit ansteigender Ordnungszahl der Lanthaniden ständig im Wert. Außerdem wurden Werte für die Enthalpieänderungen bei der Desolvatation, für den schnellen und den vierten Zersetzungsschritt und für die Aktivierungsenergien des schnellen und vierten Zersetzungsschrittes erhalten.
    Abstract: Резюме Методами ТГ-ДТГ, ДТА, ДС К и ИК спектроскопии изучены реакции и мех анизм термической диссоци ации комплексов нитр атов редкоземельных элем ентов с краун-эфиром бензо-15-краун-5. Результ аты показали, что проц ессы диссоциации комплек сов протекают в несколько стадий, одн ой из которых являетс я реакция быстрого разложения. Температурный пик реакции быстрого разложения для всех к омплексов лантаноидов (за исклю чением прометия и тулия) уменьшается с увеличением атомног о веса элементов. Кроме того, были получены значения изменения э нтальпии процесса де сольватации, реакций быстрого и че твертой стадии разложения, а также эн ергии активации этих двух процессов.
    Notes: Abstract Thermal dissociation reactions and mechanism of complexes of rare earth(iii) nitrates with the crown ether benzo-15-crown-5 were investigated by means of TG-DTG, DSC, DTA and IR technique. The results have shown that the dissociation processes of the complexes consist of several steps, one of which is a fast decomposition reaction. The fast decomposition peak temperatures (DSC) of all the complexes of the lanthanides (except Pm and Tm) decrease regularly with increasing atomic number. Moreover, values of the enthalpy change of desolvation, fast and the fourth step of decomposition and the apparent activation energies of fast and the fourth step of decomposition were obtained.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 16 (1991), S. 31-35 
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In this paper the distribution of the nitroglycerin (NG) content in the coating of solid double-base propellant charge during various time at three aging temperatures were found by using thermogravimetric analysis (TG), and the separation and cracking of the coating were observed. The results showed that the differences of NG contents in the coating are significant and are a main reason giving rise to the separation and cracking of the coating. A empiric functional relation of NG content distribution in the coating to the thickness and aging time and temperature was obtained from measured data. On the basis of the NG contents in the boundary layer of the coating contracted with the propellant and times of separation or cracking of the coating. The service life of the charge was predicted.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 14 (1989), S. 212-214 
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In this paper an application of thermogravimetric-derivative thermogravimetric analysis (TG-DTG) to the measurement of the nitroglycerin (NG) in thc coating of the rocket propellant was developed. In comparisons with gas chromatography (GC) and weight method (WM), TG-DTC has been confirmed to he even more available to measure rapidly migration of NG in thc coating. The new method is accurate to within ± 0.5% and its standard deviation is O.1. The method is of actual significance in respect of thc investigation of the migration regularity of plasticizer, the selection for coating materials and the prediction of service life of the solid propellants.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2007-12-01
    Print ISSN: 1089-5639
    Electronic ISSN: 1520-5215
    Topics: Chemistry and Pharmacology , Physics
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