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Counterion activity in dilute salt-free solutions of some anionic polyelectrolytes

Authors
Journal
Polymer
0032-3861
Publisher
Elsevier
Publication Date
Volume
33
Issue
6
Identifiers
DOI: 10.1016/0032-3861(92)90775-r
Keywords
  • Salt-Free Polyelectrolytes
  • Sodium Ion Activity
  • Osmotic Activity
  • Potentiometric Activity
  • Manning'S Counterion Condensation Theory

Abstract

Abstract This paper presents experimental data on sodium ion activities obtained by two methods in salt-free solutions for four anionic polyelectrolytes in their completely neutralized sodium salt form. Treatment of the data reveals some quantitative disagreement with theoretical predictions although there is considerable qualitative agreement with the main proposition of Manning's counterion condensation theory. A striking disparity between potentiometric and osmometric results is noted and an explanation is offered.

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