Displacement of polymers. II. Experiment. Determination of segmental adsorption energy of poly(vinyl-pyrrolidone) on silica

The displacement of poly(vinylpyrrolidone) (PVP) from silica in two different solvents (water and dioxane) by a number of low molecular weight organic displacers was studied. The experimental data compare favorably with a theory developed in a previous paper. Using this theory we determined the segmental adsorption energy for PVP to be 4 kT, both in dioxane.and in water. This result is in good agreement with inferences from calorimetric and spectroscopic-bound fraction studies