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  • 1965-1969  (1)
  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 98 (1966), S. 58-65 
    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 Reaktion von H2O mit Al-triäthyl (Al(C2H5)3) und der Initiierungsmechanismus der Polymerisation wurden durch Anwendung von tritiiertem H2O untersucht. Beträchtliche Tritium-Anteile aus tritiiertem H2O verblieben im System Al(C2H5)3/H2O bei Zimmertemperatur. Wärmebehandlung des Systems bewirkte eine starke Abnahme des Tritium-Gehalts und einen Verlust der Katalysatoraktivität. Mit dem System Al(C2H5)3/H2O hergestellte Polymere erwiesen sich als radioaktiv. Auf Grund der Ergebnisse wurde angenommen, daß im System Al(C2H5)3/H2O acider Wasserstoff vorhanden und für die Initiierung einer kationischen Polymerisation verantwortlich ist.
    Notes: The reaction between H2O and triethylaluminum Al(Et3) as well as the initiation mechanism of the polymerization by the system AlEt3/H2O have been examined by means of tritiated water, Considerable amount of tritium from tritiated water remained in the system AlEt3/H2O prepared at room temperature. Heat treatment of the system causes both the extensive decrease of tritium content and loss of catalyst activity. Polymers of styrene and isobutyl vinyl ether prepared by the system AlEt3/H2O were found to be radioactive. These findings have been taken to assume that acid hydrogen does exist in the system AlEt3/H2O and is directly responsible for the initiation of cationic polymerization.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
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