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悬浮聚合大粒径磁性高分子微球的制备及其表征
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摘要
磁性高分子微球是指由无机纳米磁性粒子与有机高分子材料结合而生成的一种复合微球,其兼具磁响应性和高分子微球的表面功能性,在生物分离工程和生物医学工程应用中已经展现出独特的优势,成为当今研究的热门课题之一。
     在本文中我们详细探讨了悬浮聚合法制备大粒径磁性微球的工艺条件,研究了各种反应条件(如:悬浮分散剂的种类和用量、单体种类、单体/水比、搅拌强度、聚合温度、聚合时间等)对微球产生的影响。利用光学显微镜观察微球形貌,并进行粒径分析;通过磁铁,振动磁强计对不同反应条件下微球的磁性进行对比研究;通过红外测谱仪分析了微球的表面基团;并利用接触角分析仪对微球的表面亲水――疏水性进行了详细的研究;通过偶联山羊抗人IgG-FITC的实验分析了微球的生物相容性。
     本试验中我们通过一步悬浮聚合法制备的大粒径磁性微球,显微镜下呈现出光滑规整的球形,无团聚,具有很好的单分散性和相对较窄的粒径分布;并具有超顺磁性和良好的耐腐蚀性;表面带有丰富的官能团,偶联抗体实验表明我们制备的磁性微球具有很好的生物相容性。
Magnetic microspheres are compound formed by combining inorganic magnetic nanoparticles with organic polymer, which have concurrently magnetic response and surface functionality. Magnetic microspheres have been one of the hot researches because of the unique advantages in the fields of bioseparation, biomedical engineering and so on.
     In the job, we discussed the technique conditions of the preparation big-size magnetic microspheres by suspension polymerization, and investigated the influence factors to microspheres properties, such as dispersant’category and dosage, monomers’category, the volume ratio of monomer/water, stirring intensity, polymerization temperature and so on. We obtained the microspheres’morphology by the optical micrographs and analyzed the particle size; and did some compared study by VSM, FTIR and so on.
     In the present work, we synthesized magnetic microspheres by one-step suspension polymerization. The resulting magnetic microspheres have good morphology and properties with uniform and spherical form, narrow size dispersion and superparamagnetism. And the products’surface has abundance functional groups. The paper also reports the magnetic microspheres can be linked well with the IgG-FITC, which indicates its potential application in the fields of biomedical diagnostics, biotechnology and bioengineering.
引文
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