Polyacrylamide Magnetic Hydrogels Modified By Interpenetrating Polymer Network

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.