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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 80 (1979), S. 119-127 
    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: Zahlreiche Copolymere mit Benzimidazolringen, Alkylen- und Arylengruppen in der Kette wurden aus 3,3′-Diaminobenzidintetrahydrochlorid-dihydrat und Dicarbonsäuren in Polyphosphorsäure hergestellt. Die Viskositätszahlen dieser Polymeren in conc. H2SO4 wurden bei 30, 40 und 50°C bestimmt. Es wurde kein systematischer Gang der Huggins-Konstante mit der Temperatur gefunden. Q- und A-Werte der Gleichung η = A · exp(Q/RT) wurden für diese Polymeren in H2SO4 bestimmt. Aus den A-Werten wurde geschlossen, daß die meisten Polymeren steife Ketten bilden, mit Ausnahme derer, die cis-Vinylengruppen in der Kette enthalten.
    Notes: Various copolymers having benzimidazole rings along with alkylene and arylene groups in the backbone were prepared from 3,3′-diaminobenzidine tetrahydrochloride dihydrate and dicarboxylic acids in polyphosphoric acid. The viscosities of these polymers in concentrated sulphuric acid (98%) have been determined at 30, 40 and 50°C. There is no systematic variation in the value of K′ (Huggins constant) with temperature. Values of Q and A in the expression η = A exp(Q/RT) were obtained for these polymer samples in H2SO4. On the basis of the ‘A’ values, it has been concluded that most of these polymers were stiff chains with the exception of those containing cis-vinylene groups in the backbone.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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