Research on WPU‐RGO/ATP‐Fe3O4/chitosan composites with excellent electrical and magnetic properties

Abstract

First, attapulgite‐Fe3O4 magnetic filler (ATP‐Fe3O4) was prepared by using a chemical precipitation method. Subsequently, graphite oxide (GO) was prepared through Hummer method, and then reduced GO (RGO) was prepared through GO reduced by chitosan (CS). Finally, a series of WPU‐RGO/ATP‐Fe3O4/CS composites were prepared by introduced RGO/ATP‐Fe3O4/CS to waterborne polyurethane. The structure and properties were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), X‐ray diffraction (XRD), vibrating sample magnetometry (VSM), thermogravimetric analysis TGA, conductivity test, and tensile test. The experimental results indicated that thermal stability and tensile strength of nanocomposites were improved with the increase of the content of RGO/ATP‐Fe3O4/CS. Meanwhile, with the increase of the RGO/ATP‐Fe3O4/CS content, the electrical and magnetic properties of WPU‐RGO/ATP‐Fe3O4/CS composites were improved. When the content of RGO/ATP‐Fe3O4/CS was 8 wt%, the electrical conductivity and the saturation magnetic strength of WPU‐RGO/ATP‐Fe3O4/CS composites were 3.1 × 10−7 S·cm−1 and 1.38 emu/g, respectively. WPU‐RGO/ATP‐Fe3O4/CS composites have excellent electrical and magnetic properties.