Abstract:

In order to prepare colored composite microspheres with unifprm particle size and high dye content, cationic polymer microspheres poly (styrene (St) -butyl acrylate (BA) -vinylbenzyltrimethyl-ammonium chloride(VBT)) were synthesized by soap=free emulsion polymerization. Colored microspheres were perpared by using the electrostatic attraction and intermolecular force between the reactive dye molecules and the cationic polymer microspheres. The influence of dye dosage and stirring speed on the properties of colored copolymer microspheres were investigated by transmission electronvicroscope, nano-particle size and Zeta potential nanlyzer and equilibrium dialysis technology. The results indicate that thecolored copolymer microspheres are regularly spherical and have smooth surface. The negative charge of the surface, the absolute value of Zeta potentials (greater than 30 mV), and the dye content increase with increasing of the dye dosage although the particle size of the colored copolymer microspheres decreases. With the variation of the stirring speed, the particle size of the colored copolymer microspheres decreases, the size distribution becomes narrow and the adsorption amount of dye increases.

Key words: colored copolymer microsphere, dye doasge, stirring speed, Zeta potential, adsorption content