Abstract
Monodispersed spherical particles (0.1 μm diameter in the latex phase) of microgels with different crosslinking densities have been synthesized by emulsion polymerization. The theological properties of suspensions of these particles have been studied over a wide concentration range. It is shown that the viscosity (especially at low shear rate) and the dynamic moduli undergo a strong transition when the concentration is such that the particles are closely packed. Increasing the cross-linking density of the spheres leads to an increase of the elastic modulus when the concentration is above this critical concentration. The addition of linear species can be used to adjust the theological properties of the suspensions. Two competing effects are involved. Either the viscosity of the suspending medium is increased or the particles undergo an osmotic deswelling from the linear chains. Molecular weight and concentration of the linear chains can be chosen to promote the desired trend.
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