新型多孔磁性聚苯乙烯微球的制备及性能研究

Research on the preparation and properties of novel porous magnetic polystyrene microspheres

采用相反转工艺一步法制备了新型多孔聚(苯乙烯-丙烯酸羟乙酯-二乙烯基苯)/Fe 3O 4复合微球。首先,将包含纳米Fe 3O 4粒子、苯乙烯、丙烯酸羟乙酯、二乙烯基苯及其致孔剂环己烷的混合物进行预聚合,然后加入表面活性剂和水相溶液,反应体系在高速搅拌下从油包水体系转化为水包油体系进行聚合反应,得到多孔磁性聚苯乙烯共聚物/Fe 3O 4复合微球。采用透射电镜、激光粒度分布仪、红外光谱仪、比表面积分析仪、差示量热-热重同步热分析仪(DSC-TG)对微球的微观结构和性能进行了表征分析。结果表明:所制备的多孔磁性聚苯乙烯共聚物复合微球呈现球状或近球状形貌,内部包含分布不均匀的Fe 3O 4粒子,粒径主要分布在1~10μm,等温吸脱附曲线为具有H3型回滞环的IV型,孔径分布在3~70nm,微球中Fe 3O 4含量约为25.86%。

Novel porous poly(styrene-hydroxyethyl acrylate-diethylbenzene)/Fe 3O 4 microspheres were prepared by a one-pot method via a phase inversion process.In this technique,the mixture containing nano-Fe 3O 4 particles,styrene,hydroxyethyl acrylate,diethylbenzene and the porogen cyclohexane were firstly pre-polymerized for a while,and then the surfactant mixture and aqueous solution were added.Under a high-speed stirring,the reaction system was transformed from water-in-oil system to oil-in-water system.After a following polymerization,porous magnetic polystyrene copolymer composite microspheres were obtained.The microstructures and properties of the microspheres were characterized and analyzed using transmission electron microscopy,laser particle size distribution analyzer,infrared spectrometer,BET surface area measurement and DSC-TGA synchronous thermal analyzer.The results showed that the prepared porous magnetic polystyrene copolymer composite microspheres were spherical or near-spherical morphology with Fe 3O 4 particles dispersed inside unevenly,and the particle size was mainly in the range of 1~10μm.The isothermal adsorption and desorption curve showed a type IV with an H3 hysteresis loop.The pore sizes ranged from 3 to 70nm.The content of Fe 3O 4 in the microspheres was about 25.86%.