Characterization of Nanoparticles Based on Block Copolymer Micelles

摘要

Three-layer nanoparticles were prepared by #gamma#-radiation induced polymerization of methyl methacrylate (MMA) in polystyrene-block-poly(methacrylic acid) aqueous micellar solution , and their structure was studied by small -angle neutron scattering(SANS).The scattering data were fitted using the bare-core approximation for a two-component core to elucidate the distribution of MMA before polymerization and the sturcture of nanoparticles with polymerized MMA. The newly formed polyer(poly(methyl methacrylate) , PMMA) is deposited on the surface of polystyrene cores of the original micelles. The thickness of the PMAA layer(8-139 A for the presented series of samples )depends on the monomer concentration. The SANS results indicate that the PMMA layer is penetrated by the poly(methacrylic acid) corona chains forming channels accessible to water