亚微米级单分散聚苯乙烯微球的制备和影响因素研究  

Preparation of Submicron Monodisperse Polystyrene Microspheres and the Influencing Factors

作　　者：严亚[1] 宋正芳[2] 张坤[2] 陈启明[2] 

机构地区：[1]大理学院药学院,云南大理671000 [2]华东师范大学化学系,上海200062

出　　处：《大理学院学报（综合版）》2008年第6期65-68,共4页Journal of Dali University

摘　　要：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。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.

关 键 词：聚苯乙烯 无皂乳液聚合 温度 引发剂浓度 离子强度 

分 类 号：O648[理学—物理化学]