自组装法制备磺化聚苯乙烯@Fe3O4磁性复合颗粒及其磁性能

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

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Fe^2+/和Fe^3+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Fe^2+/Fe^3+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。

Achieving controllable structure and uniform coating is the key for the preparation of core-shell magnetic composite materials.The exchange of Na+with Fe^2+/and Fe^3+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 Fe^2+/Fe^3+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.