交联聚合物磁性复合微球的制备与性能研究

Study on Properties and Preparation of PAA-PMMA Magnetic Microspheres with Crosslinking Structures

由共沉淀法制备磁性Fe3O4纳米颗粒,并用油酸钠对其表面进行改性,得到了平均直径为12.7nm的油基Fe3O4纳米颗粒。在该纳米颗粒存在的条件下,通过分散共聚制得了内部为Fe3O4,外层为二乙烯基苯(DVB)交联的聚丙烯酸-co-聚甲基丙烯酸甲酯(PAA-co-PMMA)磁性复合微球。研究了介质乙醇/水的比例、引发剂、分散剂、交联剂用量对形成复合微球的影响,得出了制备复合微球的优化实验条件,并对复合微球的结构、形态、尺寸及磁含量进行了考察。

Fe3O4 nanoparticles were synthesized by chemical co-precipitation. Then adding a mount of sodium oleate to modify the surfaces of the nanoparticals to obtain the oil-base Fe3O4 nanoparticles which average diameter was 12.7nm. The core-shell structured magnetic composite microspheres with poly（acrylic acid）-co-poly（methyl methacrylate） （PAA-PMMA） as shell and Fe3O4 as core were pre- pared by dispersion polymerization using divinylbenzene （DVB） as cross-linking agent, 2,2＇-azobi- sisobutyronitrile （AIBN） as initiator, poly（vinylpyrrolidone） （PVP） as stabilizer in the presence of oil-base Fe3O4 nanoparticles. The effect of the ratio of ethanol to water, amount of AIBN, PVP and DVB on the microsphere formation were investigated. The optimum recipe was finally obtained. The structures, morphologies, diameter, diameter distribution and magnetic amount of the magnetic composite microspheres were characterized.