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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 945-952 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Abhängigkeit der Taxie von radikalischem Polyvinylchlorid von der Polymerisations-temperatur wurde mit 13C-NMR (Triaden und Diaden) und IR (Diaden) untersucht. Die Stereokontrolle folgt bei der radikalischen Polymerisation in Substanz bei 0°C einer BERNOUILLI-Statistik. Die berechneten Werte für die Aktivierungsenthalpie- und-entropieunter-schiede wiesen darauf hin, daß radikalische Polymethylmethacrylate relativ leichter syndiotak+ische Anordnungen bilden als radikalische Polyvinylchloride.
    Notes: The variation of the tacticties of radical poly(vinyl chloride)s as a function of the polymerization temperatures has been examined by 13C-NMR (in terms of triads and tetrads) and IR (in terms of dyads). It has been observed that BERNOUILLIan statistics could be verified at 0°C for radical polymerization in bulk. The calculated values of differential enthalpies and entropies of activation revealed that, relatively, radical poly(methyl methacrylate)s propagate more easily in syndiotactic placement than radical poly(vinyl chloride)s.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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