Studies on the interaction between polyion and counterions by sound velocity (II).
Sound velocities in polyacrylate solutions neutralized by tetraalkylammonium hydroxide were measured at various concentrations of added NACl. From the results, the degree of counterion binding to polyion and the extent of the changes in hydration volume due to ion binding were determined as a function of the degree of neutralization, alpha. The ion binding accompanying the volume changes appeared above about alpha = 0.6 and the ion binding process depended on the charge density of the polyion. The effect of the size of the tetraalkylammonium ion on ion binding was negligibly small.
Koda
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Department of Chemical Engineering, School of Engineering Nagoya University, Chikusa-ku Nagoya-shi, 464 Japan.
Tsukamoto
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S
Nomura
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H