亚微米级单分散聚苯乙烯微球的制备和影响因素研究

目的：考察合成条件对快速法合成的聚苯乙烯（PS）微球粒径和分散系数的影响。方法：在保持其它影响因素不变的前提下,分别改变温度、引发剂浓度、离子强度,采用无皂乳液聚合法制备PS微球。结果：通过扫描电镜（SEM）观测合成的PS微球的形貌,并据此测算微球粒径和分散系数。结论：温度是影响微球粒径的重要因素,在反应温度为55～80℃之间,以水为分散介质的无皂乳液聚合法可制备出单分散性很好的亚微米PS球;引发剂浓度增加,微球粒径先减小,后增大,当引发剂浓度过大时（≥9.93×10^-3mol·L^-1）,分散系数变大,微球粒径不均匀;微球粒径随离子强度的增加呈增大趋势,但离子强度的增大容易导致微球粒径分布变宽。

Preparation of Submicron Monodisperse Polystyrene Microspheres and the Influencing Factors

Objective：The influencing factors on polystyrene（PS） microsphere diameter and size distribution were investigated for the preparation of the submicron monodisperse PS microspheres.Methods：PS microspheres were prepared rapidly by soap-free emulsion polymerization in aqueous solution through varying the polymerization temperature,initiator concentration,and ionic strength,separately.Results：The morphologies,diameter and size distribution of PS microspheres were investigated with Scanning Electron Microscope（SEM）.Conclusion：Polymerization temperature was a very important factor which intensively affected the PS particle size.Monodisperse PS microspheres could be well prepared by EFEP at the polymerization temperature from 55℃ to 80℃.When the concentration of initiator increased,the diameter of PS microspheres decreased at first and then increased with a broad size distribution.The diameter of PS microspheres increased with increasing ionic strength,but the increase of ionic strength could lead to broadening on size distribution.