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功能性磁性高分子微球的制备与性质研究

Synthesis and Characterization of Magnetic Polymer Microspheres with Surface Functional Groups

【作者】 张向阳

【导师】 翁家宝;

【作者基本信息】 福建师范大学 , 高分子化学与物理, 2007, 硕士

【摘要】 本论文通过化学共沉淀的方法制备了颗粒均匀,大小约10nm左右的Fe3O4磁性纳米颗粒。但是,由于磁性纳米颗粒有着很大的比表面,磁性偶极间的相互吸引都易导致团聚现象的产生,如何制备出粒径小、分散性好的超细纳米粒子已成为当今倍受关注的研究热点。本文首先通过分散聚合的方法制备了表面含有羟基的磁性高分子纳米微球Fe3aO4/P(St-HEMA),通过IR、TG、DSC、XRD、TEM等表征,结果表明,制备的微球大小约为1μm左右,颗粒均匀,表面含有羟基。为了得到无机纳米颗粒和有机高分子是通过化学键的方式结合的磁性高分子微球,我们通过接枝聚合的方法对磁性纳米粒子进行了修饰,首先通过硅烷偶联剂对磁性纳米颗粒进行表面修饰。然后可以得到表面具有双键的磁性高分子微球,接着通过乳液聚合的方法表面聚合上甲基丙烯酸甲酯得到接枝聚合的磁性高分子微球Fe3O4/(MPS-PMMA)。通过测试IR、TG、DSC、XRD、TEM等表征,表明制备的磁性高分子微球大小约为20—30nm左右,颗粒均匀,分散性良好。通过分析比较表明,化学接枝聚合的方法制备的磁性高分子微球,颗粒小,分散性良好,更适合于生物医学方面的应用。然后,通过反相乳液聚合的方法制备出油酸修饰的磁性高分子纳米纤维,通过表征表明磁性纳米纤维,修饰上了一定量的油酸,具有超顺磁性。最后,通过改进的乳液聚合的方法制备了磁性导电高分子微球,所得微球的大小约为50nm,分散性良好。以上所有制备的磁性高分子颗粒,均具有超顺磁性。

【Abstract】 The Fe3O4 nanoparticles have been prepared by the chemical precipitationmethod. The Fe3O4 nanoparticles are about 10 nm diameter with an average. Wewill modify it by dispersion polymerization. The organic modified magnetitenanoparticles were synthesized by the coprecipitation and surfacemodification with HEMA Characterized by TEM, the ultrafme Fe3O4/P(St-HEMA)nanospheres had well dispersion and stabilization in aqueous fluids.The superparamagnetic Fe3O4/P(St-HEMA) nanospheres with an average diameterof 1μm were characterized significantly with functional hydroxy groups.Next, The Fe3O4 nanoparticles were modified by graft polymerication withMPS and emulsion polymerication. The graft polymerication magneticnanoparticles by the Surface modification with MPS and MMA. Characterizedby TEM、IR、TG、DSC and AFM. The ultrafme Fe3O4/(MPS-PMMA) nanospheres hadwell dispersion and stabilization.In aqueous fluids, The superparamagntic Fe3O4/(MPS-PMMA) nanosphereswith an average diameter of 20-30nm were characterized significantly withfunctional groups.Compared with dispersion polymerization, the graft polymerication magneticnanoparticles have more dispersion and more stabilization and its diametermore smaller. Thus, it is can be used in many fields, such as biotechnologyand other fields. Finally, the nanofibre with modified oleic acid wereprepared by inversemulision Polymerization. All the polymerizationnanospheres have superparamagnitic.

  • 【分类号】O631
  • 【被引频次】4
  • 【下载频次】631
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