where p and m are indexes of polymer and montmorillonite for
values of Eq. [1] and cp is the equilibrium polymer concentration
in solution.
The values of the equilibrium polymer concentration in solution
can be found from the adsorption isotherm. The adsorption
isotherm of polyacrylic acid on the montmorillonite particles
(Fig. 11) does not depend on the montmorillonite concentration
in suspension. The experimental data on adsorption can
be smoothed by Langmuir’s equation (Fig. 12) to calculate the
values of cp, with the initial polymer concentration