摘要
以苯乙烯、二乙烯苯为单体，引入混合溶剂作为致孔剂，采用悬浮聚合的方法制备了多孔交联聚苯乙烯微球，并通过有机萃取等方法带出致孔剂，形成永久性大孔。分析了搅拌速度、分散剂用量、致孔剂等因素对微球粒径分布和孔比表面积的影响，研究了不同工艺条件下的微球形态。结果表明，转速在180r／min左右，分散剂质量分数在0．15％左右时，可以制得粒径范围为0．2～0．8mm的聚苯乙烯微球，且微球具有良好的粒径分布。采用石蜡／甲苯、石蜡／乙酸乙酯为致孔剂时，可以形成纳米级小孔，且当石蜡／甲苯用量为86％时，孔比表面积可达到33．07m^2／g，并随着交联剂用量的增加而增大。
Porous cross-linked poly（styrene-divinylbenzene）micro-spheres are synthesized by traditional suspension polymerization with mixed solvent as pore-forming agent, which will be carried out by organic extraction. Many factors affect the distribution of particles and the pore surface area, such as agitation speed, concentration of dispersant, pore-forming agent and so on,are focused on analysis. It can be concluded that the PS particles whose diameter are in the range of 0. 2-0. 8 mm can be prepared, when the rotate speed is around 180r/min, and the concentration of dispersant is about 0. 15 %. Besides, the distribution of particles is also favorable. When paraffin/toluene, paraffin/ethyl acetate are as pore-forming agent, the pores of the particles are nano-sized, and the pore surface areas can be up to 33.07m^2/g, which increase with the amount of cross-linker increasing.
关键词
悬浮聚合
多孔微球
粒径分布
孔比表面积
suspension polymerization, porous micro-spheres, distribution of particles, pore surface area
