PREPARATION OF MICRON-SIZE MONODISPERSE POLYMER MICROSPHERES HAVING CATIONIC GROUPS

Micron-size monodisperse crosslinked polymer microspheres having chloromethyl groups were prepared by seeded copolymerization of styrene, divinylbenzene, and chloromethylstyrene in the presence of 2.1-mu-m monodisperse polystyrene seed particles produced by dispersion polymerization. The modification reaction of chloromethyl groups on the surfaces with polyamines such as triethylenetetramine and ethylenediamine was carried out. From the measurements of zeta potential and the amount of chloride ion released, the introduction of a large number of cationic groups at the surfaces was confirmed.