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33.07m2/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 0.2～0.8mm 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 33.07m2/g,which increase with the amount of crosslinker increasing.
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