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  • 1995-1999  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 235 (1996), S. 21-34 
    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: Elektrorheologische (ER) Flüssigkeiten, bestehend aus einem Dispersionsmittel mit niedriger Dielektrizitätskonstante und mit Ammoniakwasser oder Natriumhydroxid bei verschiedenen Konzentrationen deprotonierten Polyanilin-Partikeln wurden hergestellt. Der Einfluß der Dielektrizitätskonstante, der Leitfähigkeit des Volumenanteils der Polyanilin-Partikel, der Art des Dispersionsmittels, der Zugabe eines Benetzungsmittels sowie der elektrischen Feldstärke und der Temperatur auf die elektrorheologischen Eigenschaften der ER-Flüssigkeiten wurde untersucht. Die Ergebnisse zeigten, daß eine feuchtigkeitsunempfindliche, hochaktive elektrorheologische Flüssigkeit aus chloriertem Paraffinöl und mit Ammoniakwasser bei bestimmten pH-Werten deprotonierten Polyanilin-Partikeln hergestellt werden kann. Das Produkt wies eine Streck-spannung von 〉 10 kPa und eine Stromdichte von 〈 40 μA cm-2 bei einer Stärke des elektrischen Feldes von 2.8 kV mm-1 auf.
    Notes: Electrorheological (ER) fluids composed of a dispersing medium with a low dielectric constant and polyaniline particles, deprotonated with ammonia or sodium hydroxide at different concentrations for 24 h were studied. The effects of dielectric constant, conductivity and volume fraction of the polyaniline particles, the kind of dispersing medium, addition of surfactant, as well as the electric field strength and temperature on the ER properties of the ER fluids were investigated. The results showed that a moisture-insensitive, highly ER-active fluid can be obtained from chlorinated paraffin oil and polyaniline particles deprotonated with ammonia water at certain pH values and exhibited a static yield stress 〉 10 kPa and current density 〈 40 μA cm-2 at 2.8 kV mm-1 DC electric field.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 951-956 
    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: Colloidal suspensions containing salts of poly(methacrylic acid) which exhibit high electrorheological (ER) activity were synthesized by inverse emulsion polymerization. Factors influencing the ER effect were studied. The results showed that maximum yield stress occurred at optimum amounts of both polymeric stabilizer and crosslinking agent used in the inverse emulsion polymerization as well as a certain water content of the particles, while yield stress increased with electric field strength, average diameter of the particles below 0.9 μm, or the molar ratio of the salt to the acid. The ER activity for the suspensions containing different monovalent counter ions decreased in the following order: Li+ 〉 Na+ 〉 K+ 〉 NH4+. The phenomena were discussed with the ionic polarization mechanism. © 1995 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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