MATHEMATICAL-MODEL OF KINETICS OF POLYMER ADSORPTION ONTO A SOLID-SURFACE IN THE DIFFUSIONAL FIELD

A mathematical model of polymer adsorption kinetics from a solution on to a solid/liquid interface in the diffusional field is suggested. The kinetic model takes into account the influence on adsorption and deso rption rates of polymer molecular mass, hydrodynamic regime, and surfa ce coverage of the polymer. The correspondence of the kinetic model to experimental data on polyethylene oxide adsorption onto a silica surf ace from water in stagnation point how is shown. The surface area bloc ked by a macromolecule and the fraction of solvent in a saturated adso rbed layer have been calculated. Values are found for the rate constan ts of adsorption and desorption as well as for the constants of adsorp tion equilibrium for poly(ethylene oxide) with molecular mass from 7.1 x 10(3) to 847 x 10(3). (C) 1995 Academic Press, Inc.