Preparation and properties of magnetic scensitive hydrogel

Magnetic sensitive hydrogel has been fabricated using physical cross-linking method. polyvinly-alcohol was selected as binder and the content was 15%, magnetic powers choosed iron oxide black and iron oxide red, The mechanical properties and swelling characteristics have been studied for different content, magnetic sensibility were tested using the vibration sample magnetometer, experiments results show that iron oxide red hydrogel has better mechanical properties, swelling percentage and loss rate of water of the polyvinly-alcohol hydrogel decrease with the increasing of the magnetic particles content, the change tendency is very like, cross-linking is increased with performance the swelling performance decreasing; PVA / Fe₃O₄ has good response from the SEM photo; its magnetic properties is better.