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  • 1
    Electronic Resource
    Electronic Resource
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 11 (1991), S. 95-101 
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Synthetic membranes are increasingly used in biotechnology. The possibilities of influencing the performance by membrane operation and changing the performance by physical modification were discussed. With cellulose-2,5-acetate membranes it was shown that the modification leads to an increase in the concentration of gibberellinic acid.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    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: Rising the molecular mass of acrylonitrile polymers results in diminishing the maximum draft value and simultaneously decreasing the drawing ratio in fibre formation by the wet spinning method. The maximum drawing ratio of as-spun filaments decreases with increasing molecular mass and with rising the drawing ratio, too. With comparable conditions of fibre formation, filaments from polymers with higher molecular mass show a much lower degree of orientation in spite of similar tear resistance. Obtaining high-performance properties in wet spun filaments requires a new concept for coagulation which includes as well as polymer immanent factors and peculiarities of the process.
    Notes: Bei der Bildung von Fäden aus Acrylnitrilpolymeren nach dem Naßspinnprinzip bewirkt eine Erhöhung der Molmasse der Polymere eine Herabsetzung des maximal erreichbaren Düsenabzuges bei gleichzeitig geringerem Düsenverzugsverhältnis. Der maximale Reckgrad der ersponnenen Fäden sinkt mit steigender Molmasse und nimmt darüber hinaus mit steigendem Düsenverzug ab. Unter vergleichbaren Bedingungen hergestellte Fäden besitzen bei höherer Molmasse trotz gleicher erzielter Festigkeiten einen geringeren Orientierungsgrad. Die Erzielung von Hochleistungseigenschaften an naßgesponnenen Fäden erfordert daher ein neues Koagulationskonzept, das sowohl polymer-als auch prozeßimmanente Faktoren einschließt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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