超声辐照分散聚合制备聚苯乙烯纳米微球

Polystyrene Nanoparticles Prepared by Dispersion Polymerization under Ultrasonic Irradiation

以聚乙烯吡咯烷酮作稳定剂,将单体苯乙烯通过超声辐照分散聚合制得聚苯乙烯纳米微球,利用透射电子显微镜观察了微球形态和大小,探讨了温度、引发剂和稳定剂浓度等对聚合反应的影响。研究结果表明,与常规加热聚合相比,超声辐照分散聚合反应速度快,制备的聚苯乙烯(PS)微球粒径小。在超声辐照分散聚合下,反应1 h的St转化率达到63%,所得PS纳米粒子的平均粒径为80 nm。随着温度升高分散聚合反应速率增大,稳定剂浓度太大或太小均不利于反应的稳定进行。

Polystyrene nanopartieles were prepared by dispersion polymerization under ultrasonic irradlation. The morphologies and sizes of the latex particles were characterized with the transmission electron microscopy （TEM） ; the conversion of the monomer was determined by gravimetry. The results show that the polymerization under ultrasonic irradiation showed a faster reaction rate and higher conversion compared with conventional heating method. The conversion of St under ultrasonic irradiation was 63% within 1 h. The latex particle diameter was about 80 nm by means of dispersion polymerization under ultrasonic irradiation, which was smaller than that prepared by conventional heating method. Raising temperature was a useful way to promote the reaction.