【摘要】 以聚乙烯吡咯啉酮为稳定剂 ,十六醇为助稳定剂 ,4 ,4’ -偶氮二异 (4 -氰基 )戊酸或偶氮二异丁腈为引发剂 ,无水乙醇为分散介质 ,在微波辐照下合成了聚苯乙烯大粒子 ,在透射电镜下观察粒子形状和大小 ,制备出直径 1～ 2 .5μm的单分散聚苯乙烯微球 ,并讨论了引发剂浓度对所得聚合物颗粒直径和直径分布的影响 .通过对照实验发现微波辐照下反应速度大大加快而且合成的粒子分布很窄 ,大小均匀 .更多还原

【Abstract】 Polystyrene microspheres with large size were prepared in ethanol medium in the presence of polyvinylpyrrolidone and cetyl alcohol using 4,4’ Azo bis(4cyanovaleric) acid or azobisisobutyronitrile as initiator. Monodisperse microspheres with 1～2.5μm in diameter were obtained. The effect of the concentration of the initiator on the particle diameter was discussed. It was found that the rate of polymerization was accelerated and the particle had a narrow distribution of the diameter under microwave radiation.更多还原