The viscoelastic behaviour at 40 kHz and the steady flow properties of monodisperse polystyrene latexes, i.e. aqueous suspensions of charged polystyrene spheres, were measured through an order-disorder transition as varying the salt concentration in the solvent and the volume fraction of spheres. A latex in the ordered lattice structure showed the rigidity of about 10 3 dyn/cm 2 and the yield stress of about 1 dyn/cm 2 , which indicates that the ordered latex is a crystal in view of the mechanical properties. The ratio, 10 -3 , of the yield stress to the rigidity suggests a dislocation mechanism of the plastic flow of the ordered latex.
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Mitaku et al. (1980) studied this question.