Preparation and characterization of imidazolyl ionic liquid‐based shear thickening dispersion system

Abstract

Shear thickening liquid (STF) is a new nonNewtonian fluid widely used in industrial production. In this paper, a novel shear thickening and dispersing system, namely poly methyl methacrylate (PMMA)/1-butyl-3-methylimidazole hexa-fluorophosphate ([BMIM]PF 6), was prepared using ultrasonic with PMMA as the dispersing phase and [BMIM]PF 6 as the dispersing medium. The stability, thixotropic, reversibility, rheology, and viscoelasticity of the dispersion system was studied, respectively. The dispersed system has good stability. The dispersed system shows high response sensitivity to shear rate, as well as good reversibility to shear thickening. Compared with traditional silicon dioxide/polyethylene glycol dispersion system, PMMA/[BMIM]PF 6 dispersion system displays a significantly enhanced shear thickening effect. Nonionic surfactant triton X-100 of 4 wt% can greatly improve PMMA/[BMIM]PF 6 dispersion system's shear thickening behavior. This paper provides a new idea for the further development of protective materials by using STF.

Rheological and Technological Aspects in Designing the Properties of Shear Thickening Fluids

“…However, there are also some cases where STFs are obtained by sonochemical methods [ 32 ]. Silica is a primary choice as a solid phase for STF production [ 16 , 33 , 34 ], but other raw materials such as corn starch [ 35 ], calcium carbonate [ 36 ], titanium dioxide [ 37 ], polymethyl methacrylate [ 38 ], polystyrene [ 39 ], or ethyl polystyrene acrylate [ 40 ] are also used for this purpose. The continuous phase of an STF is usually ethylene glycol [ 41 , 42 ], poly(ethylene glycol) [ 32 , 43 , 44 ], propylene glycol [ 41 ], or poly(propylene glycol) [ 7 , 45 , 46 , 47 ].…”

Temperature-dependent anomalous viscosity of aqueous solutions of imidazolium-based ionic liquids

“…41,51,52 Under shear, the decrease 53,54 or increase 55,56 in viscosity originates from the orientation of aggregates or entanglement of mesostructures, respectively. 57,58 For some cases, with the rise in temperature of the medium, the bulk viscosity of ILs and their mixtures tend to decrease. 59,60 Sarman et al have probed the rheology of phosphonium ILs using molecular dynamics simulations.…”