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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 263 (1985), S. 381-387 
    ISSN: 1435-1536
    Keywords: polymer adsorption ; microcalorimetry ; enthalpy of adsorption ; fraction of adhered segments ; silica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Adsorption enthalpies of N-ethylpyrrolidone, oligomeric and polymeric vinylpyrrolidone from CHCl3 solution on silica interfaces (Aerosil 200) have been measured at 25 °C by microcalorimetry. The dependence on surface coverage has been examined using measured adsorption isotherms. Binding enthalpies are calculated with fractions of adhered segments obtained by IR spectrometry and wetting enthalpies received from calorimetry. Fractions of adhered segments are derived from the adsorption enthalpies assuming equal binding enthalpies of monomers and polymer segments and considering desorption enthalpies of the solvent depending on the surface area of the polymer segments. The resulting enthalpies are compared with literature values from other solvents and the incongruity of the fraction of adhered segments obtained by IR, ESR, NMR and microcalorimetry is explained.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 86 (1974), S. 451-451 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 36 (1964), S. 378-380 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Zur Messung der freien Diffusion von Flüssigkeiten werden zwei Lösungen übereinandergeschichtet. Dabei muß eine Verwirbelung der Grenzschicht vermieden werden. Dies wird durch eine besonders konstruierte Zelle erreicht. Messungen an den Systemen Glucose/Wasser, Saccharose/Wasser, Polyäthylenglykol/Wasser und Polystyrol/Benzol zeigen eine gute Reproduzierbarkeit und liefern Werte, die gegenüber Literaturwerten etwas höher sind.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 49 (1961), S. 200-213 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The experimental results of the previous publications I and II are compared with the results of literature. The discussion shows that the picture of the adsorption of macromolecules which has usually been accepted is not satisfactory. Especially the multilayer adsorption which was experimentally proved requires a broader basis of the theory of macromolecular adsorption.
    Notes: Die in den vorhergehenden Arbeiten I und II ermittelten experimentellen Befunde werden Ergebnissen der Literatur gegenubergestellt. Die Diskussion zeigt, daß die bisherigen Vorstellungen über die Adsorption von Makromolekeln nicht ausreichen und speziell durch die von uns eindeutig festgestellte Mehrschichtenadsorption eine breitere theoretische Basis als bisher gefordert wird.
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  • 5
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: A large scale apparature for preparative precipitation fractionation of polymers is described, 100 g. of polymer in a 1% solution can be applied. The way of fractionation is discussed for polystyrene VI (Mw/Mn = 2.6). It is shown that a high number of repeated fractionations is necessary to get samples, whose distribution curves do not overlap though they still have a finite molecular weight distribution.
    Notes: Eine Anlage zur präparativen Fällfraktionierung von Hochpolymeren wird beschrieben, die so ausgelegt ist, daß ca. 100 g an Ausgangssubstanz aus 1-proz. Lösung fraktioniert werden können. Der Verlauf einer Fraktionierung wird am Beispiel des Polystyrols VI (Mw/Mn = 2,6) diskutiert. Dabei ergibt sich, daß eine hohe Zahl von Unterfraktionen erforderlich ist, um Endsubstanzen zu erhalten, die zwar noch eine endliche Molekulargewichtsverteilung besitzen, deren Verteilungskurven sich jedoch nicht mehr überschneiden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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