Synthesis and characterization of micron-sized monodisperse superparamagnetic polymer particles with amino groups
Synthesis and characterization of micron-sized monodisperse superparamagnetic polymer particles with amino groups
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DOI：
10.1002/pola.20803
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发表时间：
2005-08-01
影响因子：
--
通讯作者：
Liu, HZ
中科院分区：
文献类型：
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作者：
Ma, ZY;Guan, YP;Liu, HZ
具有官能氨基的单分散超顺磁性聚甲基丙烯酸缩水甘油酯（PGMA）颗粒通过包括以下的方法制备：（1）通过分散聚合方法制备母体单分散PGMA颗粒，（2）用乙二胺（EDA）对PGMA颗粒进行化学改性以产生氨基，以及（3）将铁离子（Fe 2+和Fe 3+）浸渍在颗粒内部，随后用氢氧化铵沉淀它们以在聚合物颗粒内形成磁铁矿（Fe 3 O 4）纳米颗粒。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和振动样品磁强计（VSM）对合成的磁性PGMA颗粒进行了表征。SEM显示磁性颗粒的平均尺寸为2.6 μ m，并且是高度单分散的。TEM显示磁性纳米粒子均匀地分布在聚合物粒子中。红外光谱证实了磁性聚合物粒子中氨基的存在。XRD分析表明，聚合物中的磁性纳米粒子为具有尖晶石结构的纯Fe 3 O 4。VSM结果表明，磁性聚合物粒子具有超顺磁性，饱和磁化强度为16.3emu/g。磁性颗粒的Fe 3 O 4含量基于总重量为24.3%。(c)2005 Wiley Periodicals，Inc.
Micron-sized monodisperse superparamagnetic polyglycidyl methacrylate (PGMA) particles with functional amino groups were prepared by a process involving: (1) preparation of parent monodisperse PGMA particles by the dispersion polymerization method, (2) chemical modification of the PGMA particles with ethylenediamine (EDA) to yield amino groups, and (3) impregnation of iron ions (Fe2+ and Fe3+) inside the particles and subsequently precipitating them with ammonium hydroxide to form magnetite (Fe3O4) nanoparticles within the polymer particles. The resultant magnetic PGMA particles with amino groups were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), and vibrating sample magnetometry (VSM). SEM showed that the magnetic particles had an average size of 2.6 mu m and were highly monodisperse. TEM demonstrated that the magnetite nanoparticles distributed evenly within the polymer particles. The existence of amino groups in the magnetic polymer particles was confirmed by FTIR. XRD indicated that the magnetic nanoparticles within the polymer were pure Fe3O4 with a spinel structure. VSM results showed that the magnetic polymer particles were superparamagnetic, and saturation magnetization was found to be 16.3 emu/g. The Fe3O4 content of the magnetic particles was 24.3% based on total weight. (c) 2005 Wiley Periodicals, Inc.