中文摘要：

利用超声分散改进的二步溶胀法制备4～9／zm的聚苯乙烯-二乙烯苯（PSt-DVB）多孔微球，并以防晒剂parsol 1789为模型组分考察了其缓释性能。通过SEM和BET等手段表征微球表面形貌和孔结构，并研究了超声分散时间、种球类型、交联单体浓度等因素对微球性能的影响。确认超声分散的应用可以明显缩短溶胀时间；种球的粒径和分子量受分散介质极性影响较大，种球的单分散性直接决定最终粒子的形貌；随交联单体浓度增大，微球比表面积上升、孔径下降。制得的多孔聚合物微球用作化妆品活性物载体时，具有良好的缓释作用。

英文摘要：

4-9μm PSt-DVB porous microspheres were prepared by modified two-step seed swelling polymerization method and characterized by SEM and BET. The influence of ultrasonic dispersion time, seed type and DVB concentration were discussed. The results indicated that the ultrasonic dispersion can reduce the swelling time from 24h to 5- 10h, the diameter and molecular weight of the seed particles were largely influenced by the dispersion medium. The surface area increased and pore diameter decreased with the increasing of DVB concentration. The produced porous microspheres were applied to study the slow release behaviors of parsol 1789 as a model active. The results show that the porous microspheres have a promising application in slow release process.