Preparation of Uniform-sized Porous PST-DVB Microspheres by Combining Membrane Emulsification with Suspension Polymerization

Poly(styrene-divinylbenzene)(PST-DVB) microspheres were prepared by combining microporous membrane emulsification with suspension polymerization,using self-made apparatus of membrane emulsification.In this study some important influential factors on the size of microspheres,morphology of microspheres were investigated,such as the shearing force,the pipeline linear velocity and the pressure of membrane emulsification.The results showed that there was little effect of the shearing force on the particle size within a appropriate range,the morphology was fine and the particle size was uniform,when the pipeline linear velocity varied in the range of 14.38～26.49 m/min and the pressure of membrane emulsification 0.008～0.012 MPa.The pressure of membrane emulsification and shearing force are two functional elements to the dispersed phase velocity,the pressure of membrane emulsification is more important.The investigation into these elements may lead to the establishment of design guidance for enlarging such apparatus.