Effect of oxidants on morphology of interfacial polymerized polyaniline nanofibers and their electrorheological response

초록

Polyaniline (PANI) nanofibers were fabricated via an interfacial polymerization method at 0 degrees C by using 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPSA) and ammonium peroxysulfate as a dopant and an oxidant, respectively. The molar ratio of the oxidant to aniline monomer influenced the morphology (shape and size) of the resulting PANI/AMPSA nanofiber and was investigated using a scanning electron microscope and transmission electron microscope images. The conductivity of synthesized PANI/AMPSA nanofiber changed when its synthetic conditions were varied. Electrorheological (ER) performance with and without an electric field was tested for ER fluids composed of either PANI nanofibers or normal PANI. Both conventional Bingham and Cho-Choi-Jhon models were utilized to describe shear stress behavior as a function of shear rate, especially under a low shear rate range. Finally, the fibril morphology of PANI nanofibers showed a pronounced effect on the dispersion stability of the ER fluid by measuring the transmittance as a function of sedimentation time via an optical analyzer of Turbiscan.

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