无外加表面活性剂的苯乙烯悬浮聚合

Suspension Polymerization of Styrene without Extra-Surfactant

针对传统悬浮聚合制备聚苯乙烯颗粒粒径分布宽、有效粒子收率低的问题,采用过硫酸铵/磷酸钙复合分散剂体系,在无外加表面活性剂情况进行苯乙烯悬浮聚合,制备了聚苯乙烯珠粒。通过对聚合稳定性、聚苯乙烯珠粒粒径及分布的测定与分析,考察了磷酸钙、过硫酸铵的用量及比例对悬浮聚合的影响,并分析了过硫酸胺对悬浮聚合的分散稳定机理。结果表明,当过硫酸铵和磷酸钙的用量分别为单体质量的0.01%和1.00%时,悬浮聚合体系稳定,得到的粒子透明性好,平均粒径为1.35 mm,粒径分布窄;通过改变过硫酸铵和磷酸钙的用量,可以调节聚苯乙烯珠粒的平均粒径。

Polystyrene particles prepared by suspension polymerization are widely used,however,the size distribution of polystyrene particles synthesized by traditional suspension polymerization is not narrow enough and the yield of the desired particles is low. In order to solve these problems,suspension polymerization without surfactant was used to prepare polystyrene particles. The dispersion system of ammonia persulfate / tricalcium phosphate（ APS / TCP） was used as stabilizing agents in the preparation of polystyrene particles with suspension polymerization. The effects of dispersion system of APS / TCP on stability of suspension polymerization and the size distribution of polystyrene particles were discussed. In additional,the dispersion mechanism of APS / TCP system was analyzed. The results show that when the quantity of APS is 0. 01% and that of TCP is 1. 00% of the total monomer weight,suspension polymerization is stable,polystyrene particles are with good transparency,and the monodispersed polystyrene particles with average diameter of 1. 35 mm can be obtained. The particle size and its distribution can be controlled by changing the amount of ammonium persulfate and tricalcium phophate.