Fe_3O_4纳米复合水凝胶.pdf

物理化学学报( Wuli Huaxue Xuebao
ay
Acta Phys.-Chim.Sin.2011,27(5),1267~-1272
1267
Article
www.whxb.pku.edu.cn
磁性高强度聚丙烯酰胺Fe2O4纳米复合水凝胶
相梅贺昌城”汪辉亮
(北京师范大学化学学院,北京100875)
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Fe:O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Fe2O4.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.
关键词:水凝胶;Fe3O;磁性;机裓强度
中图分类号:O645
Magnetic Polyacrylamide/Feso Nanocomposite Hydrogel with High
Mechanical Strength
XIANG Mei HE Chang-cheng WANG Hui-liang
(College of Chemistry, Beijing Normal University, Beijing 100875, P R China
Abstract: Polyacrylamide(PAAM)hydrogels with very high mechanical strength were prepared using
radiation- eroid ized micelles that were formed by surfactant molecules as initiating and crosslinking
centers. PAAM/Fe O nanocomposite hydrogels were obtained by introducing Fe,o 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 Fe O
The PAAM/Fe O 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
Key Words: Hydrogel; Fe, O; Magnetism; Mechanical strength
1引言
智能复合凝胶.磁性水凝胶是对外加磁场具有响应
近些年来,智能水凝胶广受人们关注和重视:特性的一类智能水疑胶:正是这种对外加磁场的感
在水凝胶中引入具有光、电、磁等特性的功能无机知和响应功能,以及独特的韧性和滲透性,使得
纳米粒子可以得到具有对光、电、磁等产生响应的磁性水凝胶已经在药物控制释放体系、微型机械
Received: October 20, 2010; Revised: January 3, 2011; Published on Web: March 14, 2011
CorrespondingauthorEmail:plaschem(@163.com;Tel:+86-10-58806896
The project was supported by the National Natural Science Foundation of China(50673013 )and Beijing Municipal Commission of Education, China
国家自然科学基金(50673013)及北京市有机化学重点学科资助项国
C)Editorial office of Acta Physico-chimica Sinica