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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 100 (1978), S. 1307-1309 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 21 (1988), S. 268-270 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 100 (1978), S. 6644-6649 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Chemistry of materials 5 (1993), S. 672-677 
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 4019-4027 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Polymerization of carbon diselenide, CSe2, at 5 kbar and ∼100 °C has been reported to give a metallic (CSe2)n ladder polymer that superconducts near 6 K at 220 kbar pressure. Using a variety of techniques we find that the material synthesized (showing essentially the same x-ray diffraction pattern as previously published) is not (CSe2)n but instead consists of a mixture of free, trigonal Se and an amorphous C–Se polymeric composition consistent with the formula (CSe0.5)n. Interestingly, possibly as a consequence of staged reactions during synthesis, the Se phase consists of a mixture of large, aggregated crystallites (∼600 A(ring) in diameter) melting at ∼220 °C and nonaggregated small crystallites (∼150–250 A(ring) in diameter) showing a broad melting transition with an endothermic maximum at ∼180 °C. Percolation of the C–Se polymeric composition probably provides the high observed electrical conductivity [σ(300 K)≈10–20 S cm−1 and σ(300 K)/σ (8 K)≈2.5] in the presently available samples. The previously reported high pressure superconductivity is probably associated with the free Se phase in the samples, since selenium is a known superconductor in the 6 K and 220 kbar range.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 30 (1985), S. 153-158 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das dynamisch-mechanische Verhalten von Polykarbonaten wurde mit dem von Polyesterkarbonaten verglichen. Die Natur der mechanischen Relaxationen in diesen Materialien wird diskutiert. Die Ergebnisse zeigen, daß der Energiebedarf für die Bewegung der Estergruppen nicht signifikant verschieden von dem für die Karbonatgruppe ist.
    Abstract: Резюме Проведено сравнение динамического механического повед ения поликарбоната и полиэфирного карбо ната, а также обсужден а природа механических релакс аций в этих материалах. Результа ты исследований пока зали, что энергия, необходимая для пере-мещения сложнозфирных групп, мало отличается от та ковой для карбонатных звеньев.
    Notes: Abstract Dynamic mechanical behavior of polycarbonate has been compared with that of polyester carbonate. The nature of mechanical relaxations in these materials is discussed. The results indicate that the energy requirements for the motion of ester groups are not significantly different from those of the carbonate units.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 26 (1983), S. 107-115 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Kinetik der Anfangsphase des Abbaus von Poly(1,3-phenylen-isophthalamid) und Poly(chlor-2.4-phenylen-isophthalamid) wurde in inerter und oxydierender Atmosphäre thermogravimetrisch untersucht. Die aus den kinetischen Daten erhaltenen Informationen stimmen mit unseren früher veröffentlichten Untersuchungen über den Abbaumechanismus dieser Polyamide überein. Es wird gezeigt, dass die Anwendung der Methode von Freeman-Carroll auf stark teerbildende polymere Substanzen problematisch ist. Die einfache, auf einem bestimmten Reaktionsgrad sich beziehende Berechnungen in sich einschliessende Inversionsmethode nach Ozawa wird als zur Untersuchung des komplexen Abbauverhaltens von stark teerbildenden und Hochtemperatur-Polymersystemen geeignet angesehen. Bei Anwendung dieses Verfahrens wird für die Anfangsphase des Abbaus der untersuchten aromatischen Polyamide in inerter und oxydierender Atmosphäre eine Aktivierungsenergie von 215–230 kJ/mol erhalten.
    Abstract: Резюме Кинетика реакции нач ального разложения поли-1,3-фениленизофтал ьамида и поли-2,4-фениленизофтал ьамида была изучена м етодом ТГ в инертной и окислител ьной атмосферах. Полученн ая при этом информаци я согласуется с ранее п роведенными авторам и исследованиями меха низма разложения эти х полиамидов. Показано, что примене ние дифференциального м етода Фримена-Кэррол ла к высокообугливающим ся полимерным веществам является н еоправданным. Изокон версионный метод Озавы, включающ ий простое вычисление н а основе особой степе ни реакции, считается приемлемы м для изучения сложного разложения высокотемпературны х и высокообугливающих ся полимерых систем. Используя это т метод было получено значение энергии активации ра вное 215–230 кдж/моль для реакции н ачального разложени я исследованных арома тических полиамидов в инертной и окислите льной атмосферах.
    Notes: Abstract Kinetics of the initial degradation of poly(1,3-phenylene isophthalamide) and of poly(chloro-2, 4-phenylene isophthalamide) has been studied by TG in inert as well as oxidative atmospheres. The information derived from the kinetic data is in agreement with our earlier reported studies on the degradation mechanism of these polyamides. The difference-differential method of Freeman-Carroll is shown to have problems when applied to high-char forming polymeric materials. The isoconversion method of Ozawa involving simple computations based on a particular reaction extent, is considered suitable for studying the complex degradation behavior of high-temperature and high-char forming polymer systems. Using this procedure, an activation energy of 215–230 kJ/mole is obtained for the initial degradation of the studied aromatic polyamides in inert and oxidative environments.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 23 (1988), S. 2613-2621 
    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 Various thermal analysis studies were conducted to characterize metallic glasses. The methods used, namely differential scanning calorimetry, dilatometry, dynamic mechanical analysis and thermomagnetometry, are shown to be useful for studying thermally induced phenomena. Examples covered demonstrate the usefulness of thermal techniques in evaluating structural relaxation. Curie temperature, glass transition, and devitrification processes. A basis of understanding structural relaxation and the glass transition is discussed in terms of a diagram of enthalpy against temperature.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 7 (1988), S. 817-818 
    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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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 8 (1989), S. 1165-1166 
    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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