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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 258 (1980), S. 802-806 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Es werden verschiedene Versuchsbedingungen untersucht, die zur übermolekularen Orientierung in einem Dreiblockcopolymeren mit Zylinderstruktur führen. Wenn das Polymer oberhalb der Glastemperatur der beiden Blöcke einer einfachen Scherung ausgesetzt wird, richten sich die Zylinder parallel aus, wenn die Schergeschwindigkeit unter einer gewissen Grenze bleibt. Bei einer bestimmten Schergeschwindigkeit wird die Zylinderstruktur zerstört. Die Analyse des viskoelastischen Verhaltens zeigt bei dieser Schergeschwindigkeit ebenfalls eine Besonderheit.
    Notes: Summary In this study we have investigated some sets of experimental conditions leading to supramolecular orientation in a triblock copolymer with cylindrical structure. The shear modulus and viscosity of the polymer of the matrix are higher than those of the polymer of the cylinders. The orientation is obtained by means of a steady simple shear strain applied to the sample at a temperature above the glass transition temperatures of the two phases. It was found that the dynamic viscoelastic properties of the material show a singular point at a particular frequency corresponding to the shear rate in steady flow leading to the destruction of the orientation.
    Type of Medium: Electronic Resource
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