Influence of alkali metal counterions on the charging behavior of poly(acrylic acid) |
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Authors: | Amin Sadeghpour Michal Borkovec |
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Affiliation: | Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland |
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Abstract: | Charging of poly(acrylic acid) (PAA) in the presence of different alkali metal counterions was studied by precision potentiometric titration. The charging behavior can be described with a novel cylinder Stern model quantitatively. This model is based on the Poisson-Boltzmann equation in the cylinder geometry and a constant Stern capacitance. One finds an increasing cylinder radius with increasing mass of the alkali metal ion and a correspondingly decreasing Stern capacitance. The intrinsic ionization constants for the uncharged polymer are found to decrease with ionic strength, similarly to weak acids of low molecular mass. |
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Keywords: | Polyelectrolyte Titration Poly(acrylic acid) |
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