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  • 1
    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: Unter Verwendung von Schwefelsäure-Sulfat-Komplex-Katalysatoren konnte in nichtpolaren Lösungsmitteln bei Zimmertemperatur ein isotaktischer Polyvinylisobutyläther erhalten werden. Als Sulfate wurden Al-, Mg- und Cr-Sulfat verwandt. Die erhaltenen Polymeren besaßen eine größere Stereospezifität als die Polymeren die bei -78°C mit Hilfe von BF3·O(C2H5)2 hergestellt worden waren. Mit steigender Polymerisationstemperatur fiel die Stereospezifität der Polymeren nicht ab, sondern stieg eher noch schwach an.
    Notes: Using H2SO4 metal sulfate complex catalysts, in non-polar solvents isotactic polyvinyl isobutyl ether was obtained at room temperature. Al, Mg, and Cr sulfates were used as metal sulfates. These polymers had a higher regularity than that of polymers which were polymerized by BF3 · Et2O at -78°C. In the polymerization by these complex catalysts, the stereoregularity of the resultant polymer did not change or rather increased slightly with the raise of temperature.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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