Comment on “Synthesis and electrorheological characterization of polymer containing amino and carboxy groups”

The comments for the recent article on electrorheological (ER) characterization of polymer containing amino and carboxy groups based ER fluids are given by analyzing its extrapolated yield stress data as a function of electric field strengths. Using the critical electric field strengths deduced, we found that the universal yield stress equation collapses their data onto a single curve.