表面引发AGET ATRP原位聚合法制备Fe_3O_4/PGMA复合纳米粒子

Synthesis of Fe_3O_4/PGMA Composite Nanoparticles by Surface Initiated AGET ATRP in Situ Polymerization

以多元醇还原法制备亲水性超顺磁四氧化三铁（Fe3O4）纳米粒子,并利用表面引发电子活化再生原子转移自由基聚合（SI-AGET ATRP）法,制备了Fe3O4/聚甲基丙烯酸缩水甘油酯（Fe3O4/PGMA）磁性复合纳米粒子。研究了原位聚合过程中还原剂异辛酸亚锡（Sn（EH）2）用量对PGMA接枝量和复合纳米粒子磁性能的影响。结果表明：Sn（EH）2在0.005-0.03 mmol时,聚合物接枝量随着Sn（EH）2用量的增大而增加;当Sn（EH）2用量大于0.15 mmol时,PGMA接枝量先增大后减少。磁性能研究表明,复合纳米粒子在室温下具有超顺磁特性,其饱和磁化强度从改性前的Ms=73 emu·g^-1降低到Ms=1 emu·g^-1。

The hydrophilic superparamagnetic Fe3O4 nanoparticles were synthesized by a polyol reduction process. Then Fe3O4/poly（glycidyl methacrylate） （Fe3O4/PGMA） composite nanoparticles were successfully prepared via surface-initiated activator generated electron transfer atom transfer radical polymerization （SI-AGET ATRP） method. The influence of the amount of reducing agent （Sn（EH）2） on the amount of grafted PGMA and the magnetic properties of the composite nanoparticles were studied. The results show that the amount of grafted polymer increases with increasing Sn（EH）2 in the range from 0.005 to 0.03 retool. However, when the amount of Sn（EH）2 increases more than 0.15 mmol, the amount of grafted PGMA first increases and then decreases. Magnetic analysis shows that the Fe3O4/PGMA composite nanoparticles exhibited superparamagnetic properties at room temperature and saturation magnetization decreases from 73 emu.g^-1 to 1 emu.g^-1 after being grafted.