Cho, D; Oh, KS; Bae, Won; Kim, H; Lee, Y
In this study, monodispersed spherical particles of poly(acrylonitrile) were synthesized via dispersion polymerization in compressed liquid dimethyl ether using 2,2'-azobisisobutyronitrile (AIBN) as an initiator and five kinds of surfactants: PDMS-g-pyrrolidonecarboxylic acid (Monasil PCA[trade mark sign]), PDMS modified surfactants, SS-5050K[trade mark sign], KF-6017[trade mark sign], poly(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10- heptadecafluorodecyl acrylate), and poly(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl methacrylate). Using Monasil PCA as a surfactant, uniform and spherical polymer particles were generated. The size of the microsphere particles was reduced via an increase in the concentration of Monasil PCA and a reduction in the monomer concentration. Increases in the concentration of AIBN resulted in a broad distribution of microspheres. Reaction temperature and pressure did not exert significant effects on the size and size distribution of the polymer particles.