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  • Chemistry  (2)
  • 1965-1969  (2)
  • 1960-1964
  • 1969  (2)
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  • 1965-1969  (2)
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 7 (1969), S. 453-458 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The interaction between ionizable carboxyl groups and the conformation of poly-(glutamic acid) (PGA) in aqueous solution were investigated by the mechanical method. The dynamic rigidity of the PGA solution has a maximum value at the pH corresponding to about 50% neutralization point. This may be due to establishing of a maximum attractive force by proton/charge fluctuation between ionizable carboxyl groups at that pH. The dynamic viscosity has a sharp change in the region of pH 5.5-6.5. It is suggested that this behavior is due to the helix-coil transition.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 124 (1969), S. 84-90 
    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: In verschiedenen Lösungsmitteln wurden die Fluoreszenz-Spektren des Polystyrols gemessen. Das Verhältins der Intensität ID der Excimer(kurzlebendes, angeregtes Dimeres)-Bande zu der Intensität lM der Monomer-Bande hängt vom Lösungsmittel ab. Die Werte können, extrapoliert nach kleinen Konzentrationen, zur durehschnittlichen Segmentdichte im Polyimermolekül in Beziehung gesetzt werden. Oberhalb der Konzentration 0,1 g/100 ml Wächst das Verhältnis ID/IM mit der Konzentration an, und die Excimer-Bande verschiebt sich nach längerer Wellenlänge
    Notes: The fluorescence spectra of polystyrene solutions have been measured in various solvents. The ratio of the intensity ID of the excimer (short living excited dimer) band to the intensity IM of the monomer band depends on the solvent. The values extrapolated to diluted solutions may be related to the average density of segments in a polymer molecule. Above concentrations of 0.1 g/100 ml, the ratio ID/IM increases with increasing concentration, and the peak position of the excimer band shifts to a longer wavelength.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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