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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 184 (1991), S. 183-196 
    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: Oft reichen für spezielle Anwendungen die Eigenschaften von Membranen, die für die unterschiedlichsten Stofftrennungsvorhaben verwendet werden, nicht aus. Deshalb ist es üblich, Membranpolymere chemisch so zu modifizieren, daß z. B. die Selektivität oder das Sorptionsverhalten geändert werden. Dabei sollten aber die Filmbildungseigenschaften nicht beeinträchtigt werden. In dieser Untersuchung werden Methoden beschrieben, wie kommerzielle Polysulfon-Membranen für die Ultrafiltration mittels chemischer Umsetzung ohne Verlust der mechanischen Eigenschaften funktionalisiert werden können. Geeignete Verfahren sind die Sulfonierung, Halomethylierung, Aminomethylierung und Lithiierung. Von den entsprechenden Substituenten ausgehend, lassen sich weitere Umsetzungen vornehmen; somit können Membranen mit ganz speziellen Gruppen hergestellt werden.
    Notes: In recent years efforts have been increased to work with more intelligent membranes which render more than normal filtration properties. Thus, membranes have been prepared using chemically modified polymers or have been furnished with additives in order to increase their selectivity and/or special sorbing capabilities. In this paper, methods are described how commercially available polysulfone membranes can be functionalized by chemical reactions without disintegrating their mechanical properties. For this purpose, Sulfonation, chloromethylation, aminomethylation, and lithiation reactions were applied. A broad spectrum for further conversions modified membranes is opened by these chemical reactions which allow an individual fitting of the membranes with special substitutes. The chemical reactions and the analytical procedures are also described.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 559-566 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polysulfones, as well as their derivatives obtained by chemical reactions, are versatile materials for membrane preparation. The selection of an optimum material clearly depends on the separation process for which the membranes will be used. Membranes made from these materials may serve diverse functions, ranging from an actual permselective separation barrier to a support for a thin membrane layer in a composite structure. Illustrative examples of polysulfone membranes useful in these various applications are given and compared with respect to their cross-sectional and/or their surface morphology as well as in their surface charge and chemical composition.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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