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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 100 (1967), S. 175-185 
    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: Bei der Reaktion von Dimethylketen mit GRIGNARD-Reagenz in Äther werden Oligomere mit Polyketonstruktur gebildet. Der nicht destillierbare Anteil besitzt Polyesterstruktur. Daraus wird geschlossen, daß die Polyketonbildung langsam abläuft, während die Polyesterbildung eine schnelle Reaktion ist.Aus Fraktionierungsergebnissen an Polymeren, die unter verschiedenen Bedingungen hergestellt wurden, wird abgeleitet, daß drei Arten von wachsenden Ketten im dynamischen Gleichgewicht für den Polymerisationsmechanismus bestimmend sind.
    Notes: In the reaction of dimethylketene with GRIGNARD reagent of ether polyketonic type oligomers were formed, but the non-distillable fraction was of polyester type. Therefore it is suggested that the propagation reaction to polyketone proceeds slowly, but those to polyester is a fast one.From the results of fractionations of polymers prepared under various conditions, the polymerization mechanism is explained by three kinds of growing chain ends which are in dynamic equilibrium.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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