磁性高强度聚丙烯酰胺/Fe3O4纳米复合水凝胶

摘要

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.%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30 nm.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0.10 MPa.另外,该复合凝胶表现出良好的形变回复特性.