S. Chibowski et M. Paszkiewicz, Studies of the influence of acetate groups from polyvinyl alcohol on adsorption and electrochemical properties of the TiO2-polymer solution interface, J DISP SCI, 22(2-3), 2001, pp. 281-289
An influence of polyvinyl alcohol molecular weight and acetate groups, pres
ent in the macromolecule, on adsorption and electrochemical properties of t
he TiO2-polymer solution interface was studied. Calculated thickness of ads
orption layers of PVA, on the surface of the oxide, allowed assume that ace
tate groups may have meaningful influence on the polymer chain conformation
at the interface. Structure of macromolecules at titania-polymer solution
interface was compared with that of bulk of solution. Obtained data allow d
etermine the changes of the size and shape of polymer coils in the system.
The results of experiments let us conclude main factors, responsible for ob
served zeta potential and surface charge changes of TiO2. It was proved tha
t change of the ion structure of Stern layer, depends on molecular weight a
nd number of acetate groups (degree of hydrolysis) of PVA macromolecule. Po
ssible mechanism of zeta potential changes was proposed as a function of pH
of the solution and molecular weight of the polymer.