Polythiophene/borax conducting composite II: Electrorheology and industrial applications

Abstract

In this study, polythiophene (PT) and polythiophene/ borax conducting composite (PT/borax) were in‐situ synthesized using FeCl3 as oxidizing agent containing 89.2% PT and 10.8% borax. The electrorheological (ER), creep‐recovery, and vibration damping characteristics of the PT/borax composite were investigated. A volume fraction series (φ = 5–25%) of the PT/borax/silicone oil dispersions were prepared and sedimentation stabilities were determined. An ER activity was observed from the samples, when subjected to external electric field strength thus, they were classified as smart materials. Some parameters affecting the ER properties of the dispersions such as volume fraction, shear rate, electric field strength, frequency and temperature were investigated. Creep tests were applied to the suspensions to investigate the viscoelastic behaviors and recoverable viscoelastic deformations observed. Finally, real time vibration damping experiment was carried out on a modified automobile shock absorber and a 68% vibration damping capacity determined for borax/SO suspension system under E = 0.3kV/mm condition. POLYM. COMPOS., 2011.© 2011 Society of Plastics Engineers

Enhanced dielectric and electrorheological properties of needle‐like TiO2/polyrhodanine core/shell hybrid nanostructure

“…These behaviors indicate that needle‐like TiO 2 and needle‐like TiO 2 /PRh hybrid systems are able to perceive E by the strengthened electric field induced intermolecular interactions, acted as smart materials, and significantly showed the vibration damping capacity. Similar smart material behavior was reported in the study carried out on polythiophene/borax/SO system …”

Conducting poly(N-methylaniline)-coated cross-linked poly(methyl methacrylate) nanoparticle suspension and its steady shear response under electric fields

“…They can be used in shock absorbers [12], damper systems [13], microfluidics [14], and tactile displays [15] along with magnetically analogous magnetorheological (MR) fluids under external magnetic fields [16]. However, the application of ER fluids is not as successful as the case of MR fluids in general owing to their relatively lower yield stress compared to MR fluids, except giant ER fluids [17,18].…”

Dielectric relaxation in concentrated nonaqueous colloidal suspensions

“…The necessity of high fields makes it impractical to try any observation of the phenomenon in aqueous solvents, where electrolysis and Joule heating would destroy the system. Although many applications have been suggested and even implemented in ER fluids [17][18][19][20][21][22][23], the physical bases of the phenomenon cannot be considered fully understood, although the conductivity and polarizability of both the particles and the medium, as well as their frequency dispersion are known to play a fundamental role [24,25]. At this point it can be clearly understood where the connection exists between the investigation of ER and dielectric dispersion in non-aqueous media.…”