The influence of the molecular architecture and the composition of block copolymers on their solid-liquid interface behaviour were investigated in detail. For this purpose, the surface modification of hydrophilic titanium dioxide and hydrophobic copper phthalocyanine pigments in aqueous dispersion by a series of amphiphilic block copolymers has been studied.
electrokinetic sonic amplitude method
The course and the result of the surface modification of titanium dioxide and ferrous oxide pigments in aqueous dispersion by ethylhydroxyethylcellulose (EHEC) without and with mechanical treatment of the dispersion by ultrasonic power was studied by the electrokinetic sonic amplitude (ESA) method. The evaluation of the ESA data showed that the ultrasonic treatment causes a significant thickness increase of the EHEC layer on the pigment which is primarily attributed to the ultrasonically induced activation of the pigment surface.