微孔膜乳化与悬浮聚合结合法制备均一PST-DVB多孔微球

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

使用自制的微孔膜乳化装置,通过微孔膜乳化结合悬浮聚合方法,批量制备了微米级的聚(苯乙烯-二乙烯基苯)(PST-DVB)微球.实验中采用孔径为5.2μm的微孔膜,考察了膜线剪切力、管线速度和膜乳化压力对微球粒径及其分布的影响,以及膜乳化压力和膜线剪切力对分散相流速的影响.研究结果表明,膜线剪切力在合适的范围内对微球粒径影响不大,而管线速度在14.38～26.49m/min之间、膜乳化压力在0.008～0.012MPa之间时,所制备微球的尺寸均一.研究还发现膜乳化压力是影响分散相流速的最主要因素.研究结果为装置的规模化放大奠定了理论基础.

Poly（styrene-divinylbenzene） （PST-DVB） micmspheres 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 sheafing 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 sheafing 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.