Tailor-Made Block Copolymers of Poly (Acrylic Acid) as Pigments Surface Modification Agents


Nikolay Bulychev

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. As pigment stabilizers, amphiphilic copolymers consisting of poly(isobornyl acrylate) (PiBA) and poly(acrylic acid) (PAA) with well-defined molecular structure, controlled molecular weight and narrow polydispersity index have been synthesized by atom transfer radical polymerization (ATRP) using the macro-initiator strategy (to yield block copolymers). The dispersion stability, with and without the use of ultrasonic power, was studied by the electrokinetic sonic amplitude (ESA) method. Data obtained showed that the ultrasonic treatment causes a significant increase of the amount of a polymer absorbed on the particle surface, which is primarily attributed to the ultrasonically induced activation of the pigment surface.

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