文献类型：期刊文献

英文题名：Synthesis of Magnetic Spherical Polyelectrolyte Brushes

作者：Chen, Kaimin[1];Zhu, Yan[1];Zhang, Yifei[1];Li, Li[1];Lu, Yan[2];Guo, Xuhong[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]Helmholtz Zentrum Berlin Mat & Energie GmbH, German Soft Matter & Funct Mat, D-14109 Berlin, Germany

年份：2011

卷号：44

期号：3

起止页码：632

外文期刊名：MACROMOLECULES

收录：;EI(收录号：20111013715179);WOS:【SCI-EXPANDED(收录号:WOS:000286691500027)】；

基金：We gratefully acknowledge the National Natural Science Foundation of China (No. 20644003, 20774028), the National Special Fund for State Key Laboratory of Bioreactor Engineering (2060204), the Fundamental Research Funds for the Central Universities, the Key Basic Research Project of Shanghai Science and Technology Commission (10JC1403800), and the China Scholarship Council for support of this work.

语种：英文

外文关键词：Magnetite - Polyelectrolytes - Cost effectiveness - Thermogravimetric analysis - X ray diffraction - Polystyrenes - Polymerization - Synthesis (chemical) - Spheres - Nanomagnetics

摘要：Magnetic spherical polyelectrolyte brushes (MSPB) with embedded magnetite nanoparticles in core were successfully synthesized and characterized by dynamic light scattering (DLS), a scanning electron microscope (SEM), a high resolution transmission electron microscope (HRTEM), thermal gravimetric analysis (TGA), X-ray diffraction (XRD), and a vibrating sample magnetometer (VSM). At first, oleic acid modified magnetite nanoparticles (MNP) were synthesized by the coprecipitation method and then embedded into the polystyrene core by miniemulsion polymerization to obtain magnetic polystyrene latices (MPL). Finally, magnetic spherical poly(acrylic acid) (PAA) brushes were synthesized by photoemulsion polymerization. Effects of MNP and acrylic acid (AA) content on the brush structure were studied in detail. The obtained MSPB are narrowly dispersed, pH sensitive, superparamagnetic, and redispersible after aggregating by external magnetic field. Magnetic control is thus introduced into nanosized spherical polyelectrolyte brushes to achieve the recovery and controllable delivery. This approach opens a new way for the recoverable and cost-effective applications of spherical polyelectrolyte brushes.