The degradation stability towards mechanical shearing (shear stability) of poly(methyl methacrylate) (PMMA) and its copolymer with styrene at different level of concentrations have been investigated. With a view to understanding the relationship between the thickening performance (percent increase in viscosity of the solvent in the additive of the unit weight of polymers) and shear stability of...

The viscous flow behavior of a 12.5 vol% hydrophobic fumed silica (Aerosil® R816) suspension in polypropylene glycol low molecular weight (PPG400) was studied stress-controlled rheometer. steady curve showed shear thickening between two thinning regions. Time-dependent viscosity response provoked by step changes stresses corresponding to the shear-thickening region apparently agrees with thixot...