以苯乙烯(St)、二乙烯苯(DVB)为共聚单体、MAA为功能单体,以十二烷基笨磺酸钠(SDBS)和油酸(OA)为双层表面活性剂修饰的磁性γ-Fe2O3为磁性来源,制备表面亲水性的磁性无机-有机复合材料.详细探讨了功能单体MAA对磁性复合材料中磁含量和复合材料表面亲水性能的影响.分别用扫描电子显微镜(SEM)、光学显微镜(OM)、热重分析仪(TGA)及吸水率对磁性复合材料的形貌、磁性粒子分布情况、磁含量、表面亲水性等进行表征.结果表明,随着MAA浓度的增加,磁性复合粒子的粒径变小且分布变窄,复合材料的磁含量增加和表面亲水性增强.SEM和OM测试表明,磁性聚合物复合粒子球形度好且粒径分布变窄,磁性复合材料的稳定性好,磁粉含量高达17.81%.
Magnetic γ-Fe2O3/Poly(St-DVB) composite materials are prepared by modified suspension polymeri-zation of styrene(St) and divinylbenzene(DVB) in the presence of micro-sized magnetic γ-Fe2O3 treated by bilayer sur-factants(sodium dodecyl benzene sulfonate(SDBS) and oleic acid(OA)). The effects of methacrylic acid(MAA) on themagnetic content and surface hydrophilicity of magnetic composites are investigated in detail. The morphology, mag-netic particle distribution, magnetic content and surface hydrophilicity of the composite materials are characterized byscanning electron microscope(SEM), optical microscope(OM), thermogravimeter(TGA) and water-adsorbing ratio. Itis found that the high MAA concentration results in small particle size, high magnetic content and high hydrophilicity.SEM and OM pictures reveal that the magnetic polymer composites are well-shaped spheres with a rather uniform par-ticle size distribution. The TGA result shows the thermal property of magnetic composite is stable and the magneticcontent reaches to 17.81%.
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