摘要
以聚醚为致孔剂,通过悬浮聚合法制备了表面带有环氧基的多孔磁性复合微球。用红外光谱(FTIR)、扫描电子显微镜(SEM)、磁强计(VSM)、压汞法等对其进行了表征,考察了分散剂质量分数对多孔磁性微球性能的影响。结果表明,该微球粒径为35～50μm,表面有不规则孔道,w(Fe3O4)≈15.8%,饱和磁化强度8.98 emu/g。水相中w(PVA)由1.5%升至3%时,微球平均粒径由130μm变为40μm,而平均孔径亦由144 nm降为39 nm。
Porous magnetic microspheres with epoxy groups were prepared by the suspension polymerization of glycidyl methacrylate （ GMA ）, divinyl benzene （ DVB ）, and ethylene dimethacrylate （EGDMA） in the presence of polyester （porogen）. The properties of the microspheres were characterized via FTIR spectroscopy, SEM, VSM and mercury intrusion methods, etc. Moreover, effects of PVA concentration on the properties of porous magnetic microspheres were investigated. The results showed that the magnetic particles were well-shaped spheres with diameters in the range of 35 -50μm and a rather rough surface. The magnetic microspheres showed superparamagnetism in the applied magnetic field and the saturated magnetization of the microspheres was 8.98 emu/g, with the 15.8% Fe3O4 content. When the PVA concentration increased to 3%, the size of the porous magnetic microspheres grew smaller （from 130 μm decreased to 40 μm）,and the average pore size tended to shift toward smaller pore size （from 144 nm decreased to 39 nm）.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2009年第5期434-437,共4页
Fine Chemicals
基金
西北工业大学研究生创业种子基金资助(Z200769)
国家自然科学基金(50773063)~~
关键词
悬浮聚合
磁性复合微球
多孔
环氧基
suspension polymerization
magnetic microspheres
porous
epoxy groups
