Dynamic mechanical properties of polymerically stabilized dispersions

Hydrodynamic and Colloidal Interactions in Concentrated Charge-Stabilized Polymer Dispersions

“…The penetration depth δ is large compared to the oscillation amplitude α of the rod (α ≈ 50 nm according to the manufacturer). Accordingly, the maximum strain γ = α/δ is below 0.01 and thus linear viscoelastic properties of the dispersions are probed (34).…”

Dispersion polymerization in non-polar solvent: Evolution toward emerging applications

“…Strivens studied the viscoelastic properties of concentrated latex suspensions using a specially developed shear stress rheometer. [14] Ten to fifteen years later, a series of articles built on this initial study and used optical techniques [30,31,32,33], such as dynamic light scattering [31] or photon correlation spectroscopy [32], and 'mechanical' rheometers [33,34,35,36,37] to gain more information on the viscosity and shear-stress behavior (such as shear-thinning and shear-thickening properties) of sterically-stabilized particles. For example, the research group of Mewis carried out several studies using PMMA latex particles stabilized with poly (12-hydroxystearic acid) chains, which the authors synthesized using the procedure described by Antl et al [38] In one specific example, they systematically investigated the effect of the ratio between large and small particles on the viscosity and storage modulus of a bimodal suspension of PMMA latex ( Figure 3).…”

Microscopic Theories of the Rheology of Stable Colloidal Dispersions

“…When the modulus for polymerically stabilized spheres is scaled as for hard spheres (i.e., GL on kT/a') and plotted versus effective volume fraction, the data does not collapse, but rather results in a family of curves with different ratios of particle radius to polymer layer thickness, a/L [82,83]. The modulus increases and approaches hard sphere behavior as a/L increases.…”

“…To assess the quantitative capabilities of the theory, detailed predictions for poly(methy1 methacrylate) (PMMA) particles with a poly(hydroxystearic acid) (PHSA) stabilizing layer of thickness 91 nm were compared to the data of Mewis and D'Haene [83] and Frith et al [82]. Since the stabilizing polymer corresponds at least nominally to that for the surface force experiments of Costello et al [84], a planar interaction potential was constructed from the latter using the functional form from mean field theory.…”