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  • 1
    Electronic Resource
    Electronic Resource
    Raman- und Infrarotspektren der höheren, isotaktischen Poly-α-olefine I: Der Einfluß der Temperatur auf die Schwingungsspektren (1973)
    Springer
    Colloid & polymer science 251 (1973), S. 913-918 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary The influence of the side chain on stereoregularity, conformation, and crystallinity of isotactic poly-α-olefines was studied by Raman and infrared spectroscopic methods. The infrared spectra were scanned at different temperatures in a new developed cooling and heating cell. From DTA studies the parameters for the infrared measurements were optimised. Characteristic changes between 1500 cm−1 and 700 cm−1 were found and allowed to understand the side chain influence.
    Notes: Zusammenfassung Um den Einfluß der Seitenketten auf Stereoregularität, Konformation und Kristallinität von isotaktischen Poly-α-olefinen zu untersuchen, wurden raman- und infrarotspektroskopische Messungen durchgeführt. Die Infrarotspektren wurden bei verschiedenen Temperaturen mit einer von uns entwickelten Kühl- und Heizzelle aufgenommen. Aus DTA-Kurven konnten die Parameter für diese Messungen optimiert werden. In den Spektren wurden zwischen 1500 cm−1 und 700 cm−1 charakteristische Änderungen festgestellt, die Rückschlüsse auf den Einfluß der Seitenketten zuließen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01498919
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  • 2
    Electronic Resource
    Electronic Resource
    Ermittlung kinetischer Parameter durch Differenzthermoanalyse von polymerisierenden Schmelzen (1973)
    Springer
    Colloid & polymer science 251 (1973), S. 901-905 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary A method for the determination of kinetic parameters of the crosslinking polymerization of unsaturated bismaleinimides by differential thermal analysis is described. From the decrease of the area under the polymerization exotherm, rate constants and activation energies of the polymerization were determined. The results obtained by this method were compared with those obtained by other methods.
    Notes: Zusammenfassung Am Beispiel der thermisch initiierten Polymerisation von Bismaleinimiden wird eine Methode zur Bestimmung kinetischer Parameter mittels Differenzthermoanalyse beschrieben. Die zeitliche Abnahme der Fläche unter der DTA-Kurve läßt unter bestimmten Voraussetzungen Rückschlüsse auf die Reaktionsordnung und die Aktivierungsenergie des Vernetzungsvorganges zu. Die mit dieser Methode gewonnenen Ergebnisse werden mit den Ergebnissen anderer Methoden verglichen und diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01498917
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared spectroscopic determination of the kinetic data of the polymerization of aliphatic bismaleimides (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 2015-2024 
    Details
    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: Bismaleimides polymerize at elevated temperatures, forming highly crosslinked, high temperature-resistant polymers. From the decrease of the ν(H—C=) band at 3100 cm-1, rate constants and activation energies of the polymerization of four homologous aliphatic bismaleimides were determined. Up to a 20-30% conversion, the polymerization is pseudofirst order. An almost linear correlation between the activation energy and the number of methylene groups in the sequence between the maleimide residues was found.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070180710
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal degradation of poly(bismaleimides) (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 14 (1976), S. 2911-2925 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thermal decomposition of poly(bismaleimides) has been investigated by using programmed and isothermal thermogravimetric analysis (TGA) in nitrogen. Reaction rates and overall activation energies were calculated from isothermal weight less studies. For five aliphatic poly(bismaleimides) a linear correlation between the activation energies and the number of methylene groups in the sequence between the maleimide residues was found. Aliphatic poly(bismaleimides) follow first-order kinetic law up to a conversion of 60-70% having activation energies between 196 and 256 kj/mole. poly(2,4-bismaleimidotoluene) which was found to have in highest polymer decomposition temperature (PDT) did follow the first-order kinetics up to a conversion of 60% in contrast to other aromatic poly(bismaleimides). In addition to the TGA, the pyro-field ion mass spectra of the polymers were recorded and are discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.170141208
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