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  • 11
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 12 (1988), S. 407-411 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The capability of optical measurements to elucidate adsorption as well as absorption phenomena is demonstrated by using oxygen interaction with copper films as an example. The films (thickness about 30 nm) deposited under UHV conditions on glass substrates show a polycrystalline structure with a marked (111) fibre texture. Gas doses were provided at 460 K while recording simultaneously the ellipsometric response (λ = 1152 nm) and the electrical resistivity. The optical properties of the clean films correspond to well-known bulk data. O2 adsorption causes the ellipsometric angles σΔ and σψ to change by 0.05° and 0.02°, respectively. At pressures of about 1 Pa oxygen begins to penetrate into the interior of the sample which manifests itself in a further drastic increase of σΔ = 30° and σψ = 5°.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 12
    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: Basing on recent results of modelling discontinuous and continuous emulsion polymerization processes a mathematical model of the emulsion polymerization of butadiene with styrene is established. Partially the model can be applied to large-scale plants. Generally, however, its application requires particular adaption to large-scale conditions. Based on the kinetic concept a method for the continuous determination of the degree of activation at the inlet of the stirring vessel cascade is described.
    Notes: Ausgehend vom gegenwärtigen Stand der Modellierung von Emulsionspolymerisationen bei diskontinuierlicher und kontinuierlicher Prozeßführung wurde ein mathematisches Modell zur Anwendung bei der Butadien-Styren-Emulsions-polymerisation entwickelt. Es kann gezeigt werden, daß Teile des kinetischen Modells auf die technische Anlage übertragbar sind, generell aber zur Anpassung großtechnische Untersuchungen notwendig sind. Weiterhin wird aus den kinetischen Vorstellungen eine Methode zur kontinuierlichen Bestimmung des Aktivierungsgrades am Eingang der Rührkesselkaskade entwickelt und dargelegt.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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