Synthesis and slow-release behavior of functional porous microspheres

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.