One-step synthesis of core/shell-like structured polypyrrole/sodium alginate nanocomposites and their electro-responsive performances

Core/shell-like structured nanocomposites of polypyrrole and sodium alginate were synthesized through an in situ oxidative polymerization. The morphology of the samples was studied by scanning electron microscopy and transmission electron microscopy. The structure and chemical components were investigated by X-ray diffraction, Fourier-transform infrared spectroscopy, and Raman spectra. These polypyrrole and sodium alginate nanocomposites exhibited better thermal stability than that of polypyrrole as confirmed by thermogravimetric analyzer. Afterward, the electrorheological characteristics of these as-obtained samples dispersed in silicone oil were examined by a rotational rheometer. The typical electro-responsive properties were observed under an external electric field. Furthermore, compared with polypyrrole, the core/shell-like structured polypyrrole and sodium alginate nanocomposites exhibited enhanced electrorheological behaviors, providing potential application in smart automatic control systems.