Synthesis Of Well Defined Fe2o3polymethyl Methacrylate Core Shell Nanoparticles Via Atom Transfer Radical Polymerization PDF Download

Recently nanoparticles made from linear polymers has achieved great success because of its significant potential in science, pharmaceutical and drug delivery fields, but seldom are nanoparticles made by hyperbranched polymers reported. In our project, we aimed to synthesize nanoparticles from hyperbranched polymers. In the synthesis of nanoparticles, there is a limitation in getting well-defined particles; that is, the particle structure is often uncontrollable. To solve this problem, single-chain collapse is applied here to provide an easy path to obtain particles with small diameters.In this project, we synthesized nanoparticles based on a hyperbranched copolymer poly[(methyl acrylate)-co-(3-(triethoxysilyl)propyl methacrylate)], which was prepared by the copolymerization of (2-bromo-2-methoxycarbonyl)ethyl acrylate, with 3-(triethoxysilyl)propyl methacrylate (TESPMA). With (2-bromo-2-methoxycarbonyl)ethyl acrylate, as an inimer, and 3-(trimethoxysilyl)propyl methacrylate (TMSPMA) as a silicon-containing monomer, the trialkoxysilyl groups provide crosslink sites for intarmolecular single-chain collapse by gelation. These highly branched polymers were snythesized by atom transfer radical polymerization (ATRP). The nanoparticles were produced later by gelation of the triethoxysilyl groups in dilute solution to guarantee intramolecular crosslink.