光引发RAFT分散聚合制备单分散聚合物微球

Preparation of Monodisperse Polymeric Microspheres by Photoinitiated RAFT Dispersion Polymerization

使用聚乙二醇基的大分子可逆加成断裂链转移(RAFT)试剂,在乙醇/水介质中通过光引发RAFT分散聚合制备聚甲基丙烯酸甲酯(PMMA)微球。通过扫描电子显微镜(SEM)对聚合物微球的形成进行探究,并研究了实验中各反应条件对聚合物微球粒径以及粒径分布的影响。结果表明:光引发剂的浓度对聚合物微球的粒径和粒径分布影响都不大;大分子RAFT试剂的添加量在6wt%~14wt%范围内都能形成单分散的聚合物微球;随着单体浓度的增加聚合物微球的粒径相应增大。

Monodisperse PMMA microspheres were prepared by photoinitiated RAFT dispersion polymerization in ethanol/water using a PEG macromolecular RAFT agent. The formation mechanism of microspheres was investigated by scanning electron microscope(SEM). Effects of reaction conditions on the particle size and the particle size distribution of microspheres were studied. The results showed that the concentration of photoinitiator had little effect on the particle size and particle size distribution of microspheres. Monodisperse microspheres could be obtained with 6wt%~14wt% macro-RAFT agent. The particle size of microspheres increased as increasing the monomer concentration.