Electrorheology of Multiwalled Carbon Nanotube/Poly(methyl methacrylate) Nanocomposites

Abstract

Summary: Multiwalled carbon nanotube (MWNT) nanocomposites dispersed in a poly(methyl methacrylate) (PMMA) matrix were prepared via suspension polymerization, in which radicals induced on the outer wall of the MWNTs by 2,2′‐azoisobutyronitrile initiate the grafting of PMMA. The synthesized MWNT/PMMA nanocomposite particles were found to have a spherical shape and exhibit a high electrical conductivity, mainly as a result of the carbon nanotubes. A suspension was prepared with MWNT/PMMA particles in insulating silicone oil and its electrorheological properties were investigated by controlling applied direct current (DC) electric field strengths.Flow curve possessing a region analogous to the coexistence curve.magnified imageFlow curve possessing a region analogous to the coexistence curve.

Influence of particle size on shear behavior of amine-group-immobilized polyacrylonitrile dispersed suspension under electric field

“…7. Choi et al categorized the complex flow curves into three regions [21]. Region I exhibits a more solid-like behavior, while region III shows a liquid-like behavior.…”

In situ polymerized nanocomposites: Polystyrene/CNT and Poly(methyl methacrylate)/CNT composites

“…These include extrusion, melt processing, and the use of surfactants to aid dispersion. From an industrial point of view, a direct melt-based processing method for producing CNT/polymer composites would be ideal; unfortunately the results for direct blending have been limited at best [8][9][10][11][12][13][14][15][16]. One interesting approach would be to use functionalized CNTs to improve the properties, especially mechanical, of CNT-based composites.…”

Conducting polyaniline-wrapped sepiolite composite and its stimuli-response under applied electric fields

“…The Bingham equation has been used as a suitable rheological model for examining the steady shear behavior of many ER fluids as follows: where y is the yield stress, which is a function of electric field strength (E), ˙ is the shear rate, and Á is the shear viscosity. On the other hand, after more ER fluid developed, the Bingham model was found to be insufficient to give all-side information about the shear stress behavior because the shear stress often exhibits complicated behaviors [42]. On the other hand, the Bingham model was unable to explain the shear stress behavior completely because the shear stress often induces complicated behavior.…”