Preparation and Properties of Fe3O4/PAA Hydrogel Based on Fe3+-DA-APS Autocatalytic System
The Fe3O4/polyacrylic acid(PAA)hydrogel was prepared at low temperature by using Fe3O4 nanoparticles(NPs)as the magnetic component,through the free radical polymerization method using the double autocatalytic system based on ammonium persulfate(APS),dopamine(DA)and Fe3+ produced by the reaction of AA(acrylic acid)with part of Fe3O4 NPs.The results show that Fe3O4/PAA hydrogel has good mechanical properties,and the elongation at break and tensile strength are 900%and 251.1 kPa respectively.The prepared hydrogel can adhere to different substrates,and the adhesion strength remains stable at around 30.7 kPa after 20 adhesion peel cycles on steel.In addition,it can also sense minimal deformation and respond quickly within 166 ms.The Fe3O4/PAA hydrogel has good comprehensive performance and has the potential to be used in flexible sensors and other fields.
NETL
NSTL
万方数据
