Crosslinked functional microspheres with Carboxylic group have been synthesized by the method of Phaseseparated polymerization from monomers of methacrylic acid and other vinyl-type monomers. The effects of reaction condition such as comonomer

crosslinking agent

initiator and polymerization temperature

as well as polymerization time on the morphological structure of microspheres formed have been studied. The functional polymeric microspheres with good spherical form

diameter near 5 micrometers

narrow dispersion in diameter and contained carboxylic group can be synthesized stably.