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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 3177-3189 
    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: Der Mechanismus der Grenzflächen-Polykondensation wurde untersucht und für die Zeit-Umsatz-Kurven die Gleichung \documentclass{article}\pagestyle{empty}\begin{document}$$ x' = x/x_\infty = \sqrt {1 - \exp ( - 2k't)} $$\end{document} abgeleitet (x′ = relative Membrandicke). Die Morphologie der Membrane wurde mittels Röntgenstreuung und Elektronenmikroskopie untersucht; dabei wurde gefunden, daß die Polymerketten hauptsächlich senkrecht zur Grenzschicht, d.h. in Richtung des Membranwachstums orientiert sind. Mit zunehmender Membrandicke nimmt die Ordhung der Kettenpackung ab. Stabile Polyamidmembrane, die aus zwei Schichten bestehen, können dadurch erhalten werden, daß man auf eine dünne Nylon-6,10-Schicht eine Stützschicht von vernetztem Copolyamid aufkondensiert. Die Quelleigenschaften dieser Membrane wurden untersucht.
    Notes: The mechanism of membrane formation by interfacial polycondensation was studied. For the time-conversion curves the equation \documentclass{article}\pagestyle{empty}\begin{document}$$ x' = x/x_\infty = \sqrt {1 - \exp ( - 2k't)} $$\end{document} was derived (x′ = reduced membrane thickness). The membrane morphology was investigated by x-ray scattering and electron microscopy. It was found that the polymer chains are mainly oriented perpendicularly to the interface in the direction of membrane growth. The order of chain packing decreases with increasing thickness. Stable polyamide membranes consisting of two layers can be obtained by formation of a supporting layer of crosslinked copolyamide on a thin layer of Nylon-6,10. The swelling properties of these membranes were studied.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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