聚丙烯酰胺磁性水凝胶的互穿改性

Polyacrylamide Magnetic Hydrogels Modified By Interpenetrating Polymer Network

将聚丙烯酸钠引入纳米Fe3O4/γ-甲基丙烯酰氧基丙基三甲氧基硅烷(TPM)/聚丙烯酰胺(PAM)磁性复合水凝胶体系中,制备了互穿聚合物网络(IPN)超强磁性水凝胶。采用透射电镜(TEM)、激光粒度分析仪、扫描电镜(SEM)、压缩试验机和样品振动磁强计对Fe3O4纳米粒子的粒径、Pickering乳液的结构及水凝胶的结构与性能进行了测试与表征。结果表明,IPN改性水凝胶在保持原复合水凝胶优异性能的基础上,其断面结构比未改性的更为规整,水凝胶的内部缺陷减少;改性水凝胶的抗压强度可达2.8MPa以上,远高于未改性水凝胶的强度;改性水凝胶需要约50min达溶胀平衡,平衡时的溶胀率为24.9;改性后的水凝胶中Fe3O4纳米粒子的磁性并未受到影响。

A novel high-strength interpenetrating polymer network（IPN）hydrogel was prepared by introducing sodium polyacrylate into nano-Fe3O4/γ-methacryloyloxypropyltrimethoxysilane（TPM）/polyacrylamide（PAM）magnetic composite hydrogel system.The size of nano-Fe3O4 and emulsion particles and the structure of magnetic hydrogel were characterized through TEM,laser particle analyzer and SEM,and the properties of the magnetic hydrogel were studied by mechanical test,swelling test and vibrating sample magnetometer（VSM）.The results show that the sectional structure of hydrogel modified by sodium polyacrylate is more regular than that of unmodified.The compressive strength of modified hydrogel is higher than 2.8MPa,which is also much higher than the unmodified ones.The time for the modified hydrogel to achieve its swelling equilibrium is about 50 min,and the equilibrium swelling ratio is 24.9.The magnetic performance of the nano-Fe3O4 is not affected in the modified hydrogel.