Preparation and characterization of polypyrrole/nano-SrFe12O19 composites by in situ polymerization method

Polypyrrole (PPY)/nano-SrFe12O19 composites were synthesized by in situ polymerization method. The samples were characterized by TEM, SEM, XRD and IR technology. Spherical, conglobulation-like and arborization-like polypyrrole/SrFe12O19 composites were synthesized in an emulsion polymerization system for the first time. It was found that the morphology of PPY/nano-SrFe12O19 composites depended on the SrFe12O19 content of the reaction system. A possible mechanism for the formation of the different morphologic composites had been proposed. It was found that the saturation magnetization (MS) and remanent magnetization (Mr) for the composites decreased with the decrease of the nano-SrFe12O19 content. The coercivity force (Hc) for the composites increased with the increase of PPY content when the PPY content was at a low value, and then decreased with the increase of PPY content. The possible mechanism for the phenomenon had been proposed. The conductivity was measured, and the variation mechanism of the composites conductivity was analyzed in the paper.