摘要
以先后用TEOS和KH570改性的表面含双键的Fe3O4纳米粒子为唯一乳化剂,以甲基丙烯酸甲酯(MMA)为单体,制备了稳定的Pickering乳液,并通过Pickering乳液聚合制备了以PMMA为核、Fe3O4为壳的Fe3O4/PMMA磁性复合微球。用粒度分析仪、光学显微镜、扫描电镜、傅立叶红外光谱仪、热失重分析仪、振动样品磁强计对所制备的改性Fe3O4纳米粒子和磁性复合微球的结构、形态和性能进行了表征。结果表明:通过Fe3O4表面双键与单体的共聚,使微球表面的Fe3O4通过化学键与PMMA连接,所制备磁性复合微球粒径为15～20μm、磁含量为4.9%、比饱和磁化强度为2.38emu.g-1,可在外磁场下方便地分离。
Fe3O4/PMMA Magnetic microspheres with PMMA core and Fe3O4 nanoparticles shell were prepared by Pickering emulsion polymerization. Fe3O4 Nanopartieles were modified sequentially by TEOS and KH570, which endowed Fe3O4 particles with reactive C=C groups on surface and suitable surface hydrophilicity for Picketing stabilization. The magnetic microspheres were characterized by grain size analyzer,optical microscopy,SEM,FTIR,TGA, and vibration sample magnetometer（VSM）. The results indicated that Fe3 O4 in the shell was connected with polymer core by covalent bond which was formed by copolymerization of MMA and reactive C= C group on Fe3O4 stabilizer. The microspheres were spherical in shape, with a diameter of 15 -20μm, a magnetic content was 4.9% and a specific saturated magnetization intensity of 2.38 emu · g^-1 ,which could be separated easily in a outer magnetic field.
出处
《化学与生物工程》
CAS
2012年第9期36-39,共4页
Chemistry & Bioengineering
基金
国家自然科学基金资助项目(51173147)
西北工业大学研究生种子基金资助项目(z2012161)
基础研究基金资助项目(NWPU-FFR-201046)
