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  • 1
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: By applying the freeze-etching technique with different rates of cooling the solid state morphology of glycerol/H2O- and DMSO/H2O-systems, of aqueous electroyte solutions, and of aqueous and some non-aqueous polymer solutions were compared. At a high cooling rate, granular structures are obtained with aqueous polymer solutions, which are interpreted to be single polymer coils or aggregates of macromolecules. At a lower rate of cooling, lamellar or cellular structures are observed, which are discussed on the basis of “constitutional supercooling” known from the solidification of binary metallic systems.
    Notes: Mittels Gefrierätztechnik wurden bei unterschiedlicher Abkühlgeschwindigkeit die Erstarrungsmorphologien von Glycerol/H2O- und DMSO/H2-Gemischen, von wäßrigen Elektrovlytlösungen und von wäßrigen sowie einigen nichtwäßrigen Polymerlösungen verglichen. Bei hoher Abkühlgeschwindigkeit werden im Falle wäßriger Polymerlösungen partikulare Strukturen erhalten, die als einzelne Molekülknäuel gedeutet werden. Bei geringerer Abkühlgeschwindigkeit werden lamellare bzw. zellulare strukturen beobachtet, zu deren Diskussion das vom Erstarren binärer Metallegierun gen her bekannte Konzept der “konstitutionellen Unterkühlung” herangezogen wird.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
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