Dispersion‐Polymerized Carbon Nanotube/Poly(methyl methacrylate) Composite Particles and their Electrorheological Characteristics

Abstract

An in situ dispersion polymerization method was adopted to synthesize particulate composites of MWNTs and PMMA, mainly for the investigation of their electrorheological characteristics. The morphology of the PMMA microparticles synthesized in the presence of the MWNTs was examined by both SEM and TEM, showing that the MWNTs were not only grafted onto the surface of the PMMA microbeads, but were also embedded inside the synthesized microbeads. The synthesized MWNT/PMMA particulate composites were also characterized by zeta‐potential measurements and TGA for electric and thermal stability studies, respectively. A suspension of the MWNT/PMMA microparticles dispersed in silicone oil was found to show enhanced electrorheological properties on the increase of shear stresses when subjected to an external electric field, exhibiting high yield stresses despite the tiny amount of the MWNT associated.magnified image

Facile fabrication of self-assembled PMMA/graphene oxide composite particles and their electroresponsive properties

“…On the other hand, the shear viscosity decreased with increasing shear rate, showing severe shear thinning behavior under an applied electric field, demonstrating that the ER fluids transformed to solid-like after applying the electric field. In addition, the shear-thinning behavior increased with increasing electric [31], the PMMA/GO composite particles prepared using the physical adsorption method not only exhibited enhanced ER performance but also provided a facile method for the preparation of ER fluids for carbonous/polymer composites. Figure 9 shows the dynamic yield stress of the PMMA/ GO composite particle-based ER fluids as a function of the electric field strength was plotted on a log-log scale.…”

Organic semiconductors for device applications: current trends and future prospects

“…Besides polymers, appropriate surfactant molecules were also found useful in functionalizing CNTs by studying the influence of the surfactant on dispersion and other properties of CNTs [143,[179][180][181][182][183][184][185][186][187]. Lowering of surface tension due to physical adsorption of the surfactant on the CNT surfaces very effectively prevented the aggregate formations.…”

“…For instance, triisopropylsilylethynyl pentacene (TIPS-PEN) microribbons were grown using toluene and acetonitrile as the "good" solvent and the low-solubility solvent, respectively [187]. High-quality micron-sized crystals were grown at the interface without any stress from the substrate [309].…”

A chestnut-like hierarchical architecture of a SWCNT/microsphere composite on an electrode for electroanalysis

“…Polymeric thin films not only maintain their conductive properties [5,6], they also display considerable adhesion and friction, which indicates a strong interconnectivity and adhesion between CNTs and polymers as well as the resistive role of tangled carbon nanotubes against the tip [5]. However, despite some degree of success in aligning and patterning carbon nanotubes into polymeric sphere structures, assemblies of carbon nanotubes/polymer spheres are usually focused on electrostatic interactions [3][4][5][6][7][8][9][10], and attempts at chemically assembling SWCNT/microsphere composite arrays have been met only with limited success [11]. Moreover, no electrochemical properties have been addressed; only references to electrical properties are readily available [3][4][5][6][7][8][9][10][11].…”