Abstract: Dispersion copolymerization of styrene with polyethelyene glycol 200-dimethacrylae as crosslinking agent was carried out by using poly (N-vinylpy rrolidone), 2,2-azo-bisisobutyronitrile as the stabilizer and initiator, respectively. Highly monodisperse microspheres were prepared by the one-step method of dispersion copolymerization.The effects of the concentration of crosslinking agent on the microsphere morphology and copolymerization rate were studied.It was found that the crosslinking agent played an important role on the particle morphology and system stability.When the concentration of crosslinking agent was below 2.0%(mass) of styrene, all the microspheres were spherical with smooth surface. However, after the concentration reached 2.5%(mass) or higher, monodisperse microspheres with flower-liked wrinkles on the surface were obtained.

摘要： 以苯乙烯（St）为主单体，PEG200DMA(polyethelyene glycol 200-dimethacrylae)为交联剂，偶氮二异丁腈（AIBN）为引发剂，聚乙烯吡咯烷酮（PVP）为稳定剂，利用一次投料分散聚合的方法合成了交联的St-PEG200DMA共聚微球.实验发现，共聚单体PEG200DMA的投料量对微球的粒径影响不大，但对其形态影响显著.当交联剂的投料量到单体的2.5％时，得到了单分散性好的“花瓣状”微球，这种特异的表面形貌是由交联剂的链段结构决定的.