Electrorheological Behavior of Suspensions of Polyimide-Based on the Sodium Salt of 2,5-Diaminobenzenesulfonic Acid

Abstract

Electrorheological suspensions (ERS) of polyimide particles with organoelement fragments from the sodium salt of 2,5-diaminobenzene sulfonic acid were obtained for the first time. Their rheological and electrorheological characteristics, their dependence on the parameters of deformation, and the intensity of the external electric field were studied. It was found that the ERS of PI-Na polyimide particles have a significant electrorheological response. Solid-polyimide materials were previously studied using a scanning electron microscope. The effect of the polyimide concentration on the properties of the solution was studied by spectrophotometry. It was shown that polyimide suspension is a result of increasing intensity as the electric field changes the flow type from Newtonian to pseudoplastic due to polarization of the particles and formation of the chain structures along the power lines of the electric field. The influence of temperature on the change of rheological and electrorheological properties of a polyimide ERS in constant electric fields was investigated.

Generalized Einstein’s and Brinkman’s solutions for the effective viscosity of nanofluids

“…Experimental values of relative viscosity of different nanofluids were taken from Refs. [44,45,46,47,48,49,50,51,52], in which the base fluids were the water (W), etylenglycol (EG), polydimethylsiloxane (PDMS) and the fillers were the different oxide ceramics, Fe and polyimide nanoparticles and titanate nanotubes (TNT). In Fig.…”