Über Mischungsversuche und Einfluß der Heterodispersität auf die Fließkurve bei organischen Hochpolymeren

Polyelectrolyte Complexes: Phase Diagram and Intrinsic Viscosities of the System Water/Poly(2‐vinylpyridinium‐Br)/Poly(styrene sulfonate‐Na)

“…One of the outstanding features of Figure 11 consists in the fundamentally different coil expansions of the two types of polyelectrolytes in the absence of extra salt, despite their comparable molar masses: The ratio of the [ η ] values of polyanion and polycation is approximately 20 in pure water, whereas it is only 1.34 for a 2 M NaCl solution. A further – less surprising – finding concerns the pronounced deviations of the intrinsic blend viscosities from additivity, that is, from Philippoff's law,15 which states that <[ η ]> (the intrinsic viscosity for the solutions of polymer A and polymer B in a common solvent) should be given by the [ η ] values of the components and their weight fractions in the blend. The observed deviation from additivity had to be expected from earlier studies9 of a blend between uncharged polymers showing that such a behavior may result from sufficiently favorable interactions between the two types of macromolecules.…”

Interaction between Poly(vinyl alcohol) and Poly(ethylene glycol) in Water Studied by Viscosity and Density

“…This suggests the additivity of [IJ] with respect to polymer composition. Though additivity of [IJ] is generally observed in polymer-polymersolvent systems, 6 it is noted that it is also observed in PYA-PEG-water system showing a liquid-liquid phase separation at high concentration. The Huggins constant k' increased from 0.182 to 0.643 with increasing PYA content.…”