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  • Polymer and Materials Science  (4)
  • PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
  • Wiley-Blackwell  (4)
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  • Wiley-Blackwell  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 335-342 
    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: Hydrogele (vernetzte Polymere mit definiertem Wassergehalt) wurden aus hydrophilen Methacrylaten und Perfluorbutylmethacrylat durch radikalische Polymerisation und nachfolgende Quellung in gepufferter isotonischer Natriumchloridlösung hergestellt. Die erhaltenen Hydrogele wurden durch ihre lineare Quellung, den Wassergehalt, den Brechungsindex, den Gehalt an extrahierbaren Bestandteilen, ihre Transparenz für sichtbares Licht sowie durch ihre Sauerstoffpermeation charakterisiert. Derartige Hydrogele sind interessant als Materialien für Kontaktlinsen.
    Notes: Hydrogels (crosslinked polymers with a defined content of water) from hydrophilic methacrylates and perfluorobutyl methacrylate were prepared by radical polymerization, followed by swelling in buffered isotonic sodium chloride solution. The obtained hydrogel samples have been characterized by their linear expansion to hydration, weight-percent hydration, refractive index, extractables, percent transmission of visible light, and oxygen permeability. Such hydrogels are interesting as contact lens materials.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 13 (1962), S. 22-29 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The formation of a top layer on steel surfaces by means of the combined oxalic acid'chromic acid methodIn the investigations here described, the attempt has been made to analyze the mechanism of the top layer formation with the combined oxalic acid/chromic acid treatment of steel plates and to interpret the particularly effective corrossion protection obtained by this method. The mechanism of the formation of the oxalate layer and its catalytic acceleration by the so-called “working-in” compound as well as the reaction of the chromic acid with the metal surface are discussed. It is shown that the corrosion protection layer is ultimately obtained by a normal passivation of the metal surface by means of the chromic acid. The specific effect of the pretreatment with oxalic acid is based not only on a direct participation in the formation of the top layer but on a particularly favourable preparation of the surface for the subsequent passivation.
    Notes: In den beschriebenen Untersuchungen wird der Versuch gemacht, den Mechanismus der Deckschichtbildung bei der kombinierten Oxalsäure-Chromsäurebehandlung won Stahlblechen zu analysieren und die nach diesem Verfahren erreichte besonders gute Korrosionsschutzwirkung zu deuten. Der Mechanismus der Oxalatschichtbildung und ihrer katalytischen Beschleunigung durch das sog. Einarbeitungssalz sowie die Reaktion der Chromsäure mit der Oxalatschicht und mit der Metalloberfläche wird erörtert. Es wird gezeigt, daß die Korrosionsschutzschicht letztlich in einer normalen Passivierung der Metalloberfläche durch die Chromsäure entsteht. Die spezifische Wirkung der Oxalsäurevorbehandlung beruht nicht auf einer direkten Beteiligung am Deckschichtenaufbau, sondern auf einer besonders günstigen Vorbereitung der Oberfläche für die anschließende Passivierung.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 14 (1963), S. 57-57 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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