Study on Soap-free P（MMA-EA-AA/MAA） Latex Particles With Narrow Size Distribution

In the past decades, more and more studies have been focused on the synthesis of monodisperse particles with different diameter by special polymerization technique. In 1980＇ s, Ugelstad, et al invented two-step swelling method to prepare monodisperse microsphere with large size more than 1μm. In the following decade, Okubo and his coworkers synthesized monodisperse crosslinked polymer particles above 3μm using one-step dynamic swelling method. New method has been developed to produce particles more than 50 gm in diameter with a standard deviation of less than 2 % . Up to now, most of the monodisperse particles were usually prepared by polymerization of St in the presence of surfactants. In this presentation, sub-micro sized P （MMA-EA-AA/MAA） particles with narrow size distribution were prepared by seeded emulsion polymerization in the absence of any surfactant materials.