Osmotic coefficients of vinylic polyelectrolyte solutions without added salt |
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Authors: | R Kakehashi H Yamazoe H Maeda |
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Institution: | (1) Dept. of Chemistry Faculty of Science Kyushu University Hakozaki, Higashi-ku Fukuoka 812-81 Japan, JP |
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Abstract: | The osmotic pressures of –polyelectrolyte solutions without added salt was measured in the concentration ranges 0.001–0.02
and 0.2–1.9 mol kg-1. Our results show that the osmotic coefficients φp were strongly dependent on the chemical structures of polyelectrolyte through the polyion radius and the interaction between
the ionic moiety and counterions. The osmotic pressures in polyelectrolyte solutions without added salt, calculated on the
basis of the counterion contribution, are in agreement with the experimental results. We conclude that the counterion contribution
is dominant in the osmotic pressures and thus, the polymer contribution is negligible in the examined concentration range
0.2–1.9 mol kg-1. The P–B approach gave a fair prediction of the absolute values of the osmotic pressures with λ=4.5, where λ is the charge
density parameter, except for NaPA. In other words, the concentration dependence of the φp values can be explained in terms of the counterion contribution.
Received: 11 June 1997 Accepted: 19 August 1997 |
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Keywords: | Polyelectrolyte osmotic coefficient osmotic pressure Poisson Boltzmann approach semidilute solution |
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