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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 531-539 
    ISSN: 1572-8943
    Keywords: carbocationic polymerization ; char yield ; N-aryl nadimides ; ring opening metathesis polymerization (ROMP) ; thermal stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Carbocationic polymerization of N-ortho/meta/para tolyl-exo-norbornene dicarboximide (nadimide) was carried out using Pd(II) catalyst. Under similar conditions of polymerization, poly(N-m-tolyl nadimide) showed higher molecular mass compared to poly(N-p-tolyl nadimide) and poly(N-o-tolyl nadimide). Thermal stability of these polymers was evaluated by dynamic thermogravimetry in nitrogen atmosphere. The polymers were stable up to 460°C and lost mass above this temperature in a single step. The characteristic decomposition temperature and char yield of these polymers were higher than the polymers prepared by using ring opening metathesis polymerization. The difference has been attributed to the presence of rigid bicyclic ring structure in these polymers.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 7 (1969), S. 29-38 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Chlorwasserstoffabspaltung am Polyvinylchlorid wurde in phenolischen Lösungsmitteln unter Stickstoffatmosphäre im Bereich von 137° bis 206°C untersucht. Phenol, o-Cresol, Methyl-, Äthyl-, Amyl- und Phenylsalizylat wurden als Lösungsmittel verwendet. In Phenol war die Reaktion schnell und in Amylsalizylat langsam. Mit zunehmender Größe des Alkylrestes im Salizylat nahm die Geschwindigkeit der Abspaltung des Chlorwasserstoffs ab. In Amylsalizylat war die Aktivierunsenergie niedriger (26 Kcal/mol) als in o-Cresol (29 Kcal/mol) bei den anderen Lösungsmitteln lagen die Werte dazwischen. Die Ergebnisse lassen sich durch die unterschiedliche Aktivität des phenolischen Wasserstoffs und die sterische Hinderung der verschiedenen Lsöungsmittel erklären.
    Notes: The thermal degradation of polyvinyl chloride in phenolic solvents has been investigated in an atmosphere of nitrogen in the temperature range 137-206°C. The solvents used were phenol, o-cresol, methyl, ethyl, amyl, and phenyl salicylates. The reaction was fast in phenol and slow in amyl salicylate. The rate of dehydrochlorination decreased with increasing size of the alkyl side chain in salicylates. The activation energy was low in amyl salicylate (26 kcal/mole) and high in o-cresol (29 kcal/mole), and for other solvents it was in between these two values. The results have been explained as being due to the variation in the reactivity of phenolic hydrogen and to steric factors of the various substituents.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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