title: A strategy for synthesis of magnetic nanoparticles with "well-defined" polymers via reversible addition fragmentation chain transfer polymerization under ultrasonic irradiation.
abstract: The controlled graft modification of Fe3O4 magnetic nanoparticles has been achieved by reversible addition fragmentation chain transfer (RAFT) polymerization under ultrasonic irradiation. The nanoparticles of Fe3O4 were first prepared by a chemical co-precipitation method, and reacted with 3-aminopropyltriethoxylsilane (KH550), and subsequently with S-1-dodecyl-S'-(alpha,alpha'-dimethyl-alpha'-acetic acid) trithiocarbonate (DDACT) to serve as RAFT agent. The graft polymerization of methyl acrylate was carried out under ultrasonic irradiation (28 KHz, 60 W). The first-order kinetics and the polymers with narrow molecular weight distributions suggested the polymerization proceeded via RAFT process. The resultant products were characterized by Fourier transform infrared spectrometer (FT-IR), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), high performance particle sizer (HPPS) and Gouy magnetic balance. The resultant products with good paramagnetism could be well modified with the "well-defined" polymers via RAFT polymerization under ultrasonic irradiation, thereby providing a new method to well modify magnetic nanoparticles.
authors.affiliation: Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.
authors.forename: Daoben
authors.initials: D
authors.lastname: Hua
authors.forename: Jing
authors.initials: J
authors.lastname: Tang
authors.forename: Liangliang
authors.initials: L
authors.lastname: Dai
authors.forename: Yanwen
authors.initials: Y
authors.lastname: Pu
authors.forename: Xuebo
authors.initials: X
authors.lastname: Cao
authors.forename: Xiulin
authors.initials: X
authors.lastname: Zhu