利用超声分散改进的二步溶胀法制备4~9μm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.
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