✍ Scribed by Małgorzata Wiśniewska
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The influence of polyvinyl alcohol (PVA) adsorption on the structure of the diffuse layer of silica (SiO~2~) in the temperature range 15–35 °C was examined. The microelectrophoresis method was used in the experiments to determine the zeta potential of the solid particles in the absence and presence of the polymer. The adsorption of PVA macromolecules causes the zeta potential decrease in all investigated SiO~2~ systems. Moreover this, decrease is the most pronounced at the highest examined temperature. Obtained results indicate that the conformational changes of adsorbed polymer chains are responsible for changes in electrokinetic properties of silica particles. Moreover, the structure of diffuse layer on the solid surface with adsorbed polymer results from the following effects: the presence of acetate groups in PVA chains, the blockade of silica surface groups by adsorbed polymer and the shift of slipping plane due to macromolecules adsorption.
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## Abstract The color reaction of PVA solution with iodine depends upon the conditions under which the parent polyvinyl acetate was prepared, especially on the polymerization temperature. The higher the degree of polymerization of PVA and the lower the polymerization temperature of the original pol