Solution Behavior of the Poly[bis(carboxylatophenoxy)phosphazene] Polyelectrolyte

• Published in: Macromolecules Vol. 30; no. 24; pp. 7456 - 7461
• Main Authors: Dentini, M., Barbetta, A., Masci, G., Crescenzi, V., Capitani, D., Segre, A. L.
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 01-12-1997
• Subjects: Applied sciences; Exact sciences and technology; Inorganic and organomineral polymers; Physicochemistry of polymers; Properties and characterization; Carboxylate polymer; Molecular rigidity; Viscosity; Activity coefficient; Temperature effect; Experimental study; Phosphazene polymer; Polyelectrolyte; Ionic strength; Concentration effect; Counter ion; Aqueous solution; Ionic activity; Saline solution
• ISSN: 0024-9297; 1520-5835
• DOI: 10.1021/ma9703463

The behavior of a high molecular weight sodium poly[bis(carboxylatophenoxy)phosphazene] (NaPCPP) polyelectrolyte sample in aqueous solution has been investigated by means of viscosity, conductivity, sodium counterion potentiometric “activity coefficient” (γ+) measurements, and 23Na-NMR experiments. The set of data clearly and consistently points out the peculiar polyelectrolytic behavior of NaPCPP in water. In our opinion, this is essentially due to the partial hydrophobic character of flexible NaPCPP chains which would easily “entangle” even at low concentrations in water and, in addition, would give rise to “entanglement collapse” with increasing solution temperature.