The development of an equation for the potentiometric titration of linear polyelectrolytes using a site model.
An equation for the potentiometric titration of linear polyelectrolytes is derived by considering neighbor interactions of ionizable groups and the association equilibria between ionized groups and counterions. The first, second, ... and lth neighbor interactions are directly introduced into the equation, and additional neighbor interactions together with interactions between the ionizable groups and simple salt ions are taken into account as perturbed electrostatic potentials. It is observed that the approximation which includes the second or third neighbor interaction is sufficient for description of the potentiometric titration. Good agreement between predictions of the present theory and experiment is obtained for isotactic and syndiotactic poly(acrylic acids).
Sasaki
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Department of Physics, Faculty of Science, Nagoya University, Nagoya 464, Japan.
Minakata
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