磁性高强度聚丙烯酰胺/Fe_3O_4纳米复合水凝胶  

Magnetic Polyacrylamide/Fe_3O_4 Nanocomposite Hydrogel with High Mechanical Strength

作　　者：相梅[1] 贺昌城[1] 汪辉亮[1] 

机构地区：[1]北京师范大学化学学院,北京100875

出　　处：《物理化学学报》2011年第5期1267-1272,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(50673013);北京市有机化学重点学科资助项目~~

摘　　要：以辐射过氧化的表面活性剂胶束为引发中心和交联中心,制得具有优异机械性能的聚丙烯酰胺(PAAm)水凝胶,并通过原位化学共沉淀法向其中引入Fe3O4粒子,得到了磁性复合水凝胶.扫描电子显微镜(SEM)表征发现磁性粒子在凝胶中分布均匀,其粒径约为30nm.X射线衍射(XRD)表征证实所引入的纳米粒子为尖晶石型Fe3O4.磁性能测试表明,PAAm/Fe3O4复合水凝胶具有超顺磁性特征.该复合凝胶具有较优异的机械性能,其断裂伸长率可以达到1200%,拉伸强度最大可达0.10MPa.另外,该复合凝胶表现出良好的形变回复特性.Polyacrylamide （PAAm） hydrogels with very high mechanical strength were prepared using radiation-peroxidized micelles that were formed by surfactant molecules as initiating and crosslinking centers. PAAm/Fe3O4 nanocomposite hydrogels were obtained by introducing Fe3O4 nanoparticles into PAAm hydrogels through an in situ chemical co-precipitation method. Scanning electron microscopy （SEM） investigations showed that the nanoparticles were homogeneously distributed and the particles were about 30 nm in size. X-ray diffraction （XRD） analysis showed that the obtained nanoparticles were spinel Fe3O4. The PAAm/Fe3O4 nanocomposite hydrogels showed superparamagnetism. The ferrogels also had good mechanical properties, the elongation at break of some gels could be as high as 1200% and the maximum tensile strength was about 0.10 MPa, and they exhibited very good shape recoverability.

关 键 词：水凝胶 FE3O4 磁性 机械强度 

分 类 号：O648.17[理学—物理化学]