自组装法制备磺化聚苯乙烯@Fe3O4磁性复合颗粒及其磁性能

实现结构可控、均匀包覆是制备核-壳复合材料的关键。采用离子交换法完成了磺化聚苯乙烯(PSS)表面Na+与溶液中Fe2+和Fe3+的交换，于碱性条件下制备了PSS表面负载Fe₃O₄(PSS@Fe₃O₄)的磁性复合颗粒。通过称重法计算了Fe₃O₄最大包覆率；通过振动样品磁强计(VSM)测试了不同负载含量下PSS@Fe₃O₄复合颗粒的磁性能；通过XRD、衰减全反射-FTIR (ATR-FTIR)、SEM-EDS分析了PSS@Fe₃O₄磁性复合颗粒的化学组成和微观结构。结果表明，随着Fe2+/Fe3+浓度增加，PSS@Fe₃O₄磁性颗粒的饱和磁化强度也随之增大，最大饱和磁化强度为7.51 emu/g，并具有明显的磁响应性；Fe₃O₄均匀包覆在PSS表面，最大包覆率为8.3 wt%。PSS@Fe₃O₄磁性复合颗粒有望用于磁流变、医学及水处理领域。 

Preparation and magnetic properties of sulfonated polystyrene @Fe3O4 magnetic composite particles by self-assembly method

Achieving controllable structure and uniform coating is the key for the preparation of core-shell magnetic composite materials. The exchange of Na+ with Fe2+ and Fe3+ on the surface of sulfonic polystyrene (PSS) was completed by ion exchange method. The PSS surface loaded Fe₃O₄(PSS@Fe₃O₄) magnetic composite particles was obtained with alkaline existed. The maximum encapsulation rate of Fe₃O₄ was calculated by weighing method. The magnetic properties were analyzed by vibrating sample magnetometer (VSM). The chemical composition and microstructure of PSS@ Fe₃O₄ magnetic composite particles were analyzed by XRD, ATR-FTIR and SEM-EDS. The results show that the saturation magnetization of PSS@Fe₃O₄ magnetic particles increases with the increase of Fe2+/Fe3+ concentration. The maximum saturation magnetization of PSS@Fe₃O₄ magnetic particles is 7.51 emu/g which owned the obvious magnetic response. Fe₃O₄ is evenly coated on the surface of PSS, and the maximum coating rate is 8.3 wt%. The PSS@Fe₃O₄ composite particles are expected to be applied in magnetorheological, medical and waste water treatment fields.