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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 245 (1997), S. 183-191 
    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: Es wird über eine neuartige Synthese für Sternpolymere aus einem Weich-hartweich-Triblockcopolymeren berichtet. Das Dreiblock-Copolymere wurde durch insitu-Addition von Isobuten (IB) zu einer mit Dicumylchlorid/TiCI4/Pyridin initiierten lebenden Polymerisation von Styrol (S) erhalten. Untersuchungen mittels Transmissionselektronenmikroskopie und Differentialkalorimetrie zeigen eine Mikrophasenseparation des PIB-PS-PIB-Copolymeren. Durch Umsetzung des Triblock-Copolymeren mit CCI4 in Gegenwart von AICI3 wurde das Sternpolymere erhalten, dessen Anzahl der Arme mittels Größenausschlußchromatographie zu 20 bestimmt wurde.
    Notes: A novel synthesis of starpolymers from a soft-hard-soft triblock has been reported. The triblock was obtained by adding isobutene (IB) “in situ” to the living styrene (S) polymerization mixture initiated by the p-dicumylchloride/TiCl4/pyridine system. Microphase separation was observed by transmission electron microscopy and differential scanning calorimetry. Treatment of the PIB-PS-PIB triblock with CCI4 in the presence of AICI3 led to the starpolymer and the number of arms was estimated by size-exclusion chromatography to be 20.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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