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Structure and Dynamics of Ultra-Low-Crosslinked Microgels
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DOI：10.1002/pola.70233.png)
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Abstract
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Concentrated suspensions of small ultra-low crosslinked microgels are investigated with scattering and steady shear rheology to capture their equilibrium dynamics. We combine viscosimetry, dynamic light scattering, and small-angle neutron and x-ray scattering in dilute suspensions and show that the synthesis without the addition of any crosslinker agent and in presence of high concentrations of surfactants led to small ultra-soft microgels. Although the slow relaxation time increases exponentially with the generalized packing fraction, ζ $$ \zeta $$ , the relative viscosity follows a power-law dependence on ζ $$ \zeta $$ , with η r ∼ ζ 3.4 $$ {\eta}_r\sim {\zeta}^{3.4} $$ . The interplay between characteristic lengths (mesh size vs. overall size of the microgel) and the enhanced polymeric contributions of the shell make these microgels ultra-soft, enabling the formation of viscoelastic fluids even in overcrowded conditions.
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