聚(苯乙烯-马来酸酐)/Fe3O4纳米杂化材料的制备与表征

采用2,2,6,6-四甲基-1-哌啶氧化物(TEMPO)的溴盐对化学共沉淀法制备的Fe3O4纳米粒子进行表面修饰,以该粒子为过氧引发剂,苯乙烯(St)、马来酸酐(MA)为单体,采用"活性"/可控自由基聚合技术在粒子表面原位引发聚合,制备了聚(苯乙烯-马来酸酐)/Fe3O4纳米杂化材料,并对纳米Fe3O4及杂化材料进行了FT-IR、XRD、TGA、TEM和GPC表征。结果表明,所制备的纳米杂化材料的平均粒径约为70 nm,磁性粒子表面的聚合物分子链随着聚合时间的增长而增长。振动样品磁强计测试结果显示,在室温、外加磁场下,该纳米杂化材料呈现超顺磁性,饱和磁化强度随着包覆聚合物量的增加而降低。

Preparation and Characterization of Poly[ styrene-co-( maleic anhydride) ]/Fe3O4 Hybrid Materials

Fe3O4 nanoparticles,which were prepared by chemical coprecipitation,were modified by 2,2,6,6-tetramethylpiperidinyl-1-oxy bromic salt to form peroxide initiators.The polystyrene-co-(maleic anhydride)]/Fe3O4 hybrid materials were prepared by "living"/controllable free radical polymerization of styrene(St) and maleic anhydride(MA) in the presence of modified Fe3O4.Nano-Fe3O4 and the hybrid materials were characterized by FT-IR,XRD,TGA,TEM,GPC.The results indicate that its average diameter is about 70 nm.The polymer chains increase with the polymerization time.The results of magnetic performance by vibrating sample magnetometer indicate that the hybrid materials exhibit superparamagnetic properties at room temperature under applied magnetic field.Saturation magnetization decreases with the increasing amount of encapsulated polymers.