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.
Highlights
Electrorheological suspensions (ERS) are materials whose rheological properties, such as viscosity, yield strength, shear modulus, etc. [1], change under the influence of an external, electric field
PI-Na polyimide was prepared by a single-stage, high-temperature polycondensation in solution [14]
PI-Na polyimide was prepared by a single-stage, high-temperature polycondensation in ofsolution the sodium sulfonic acid (1-Na)sulfonic and 4.40 -(hexafluorisopropylidene)
Summary
Electrorheological suspensions (ERS) are materials whose rheological properties, such as viscosity, yield strength, shear modulus, etc. [1], change under the influence of an external, electric field. When an electric field is applied, the ERS switch from a low viscosity and a liquid, flowing state to a solid or viscoplastic state. These changes are reversible and occur within milliseconds. ERSs are very promising from a practical point of view. Due to their unique properties, ERSs are considered “smart materials” [2], whose properties can be adjusted as needed for various practical tasks. A number of applications for ERSs in space technology, biomechanics, biomedicine, etc., are proposed in [5]
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