Abstract
The rheological properties of bentonite clay-filled aqueous solutions of high-molecular-mass poly(ethylene oxide) (PEO) have been studied. The PEO solution is a typical polymer solution characterized by the highest Newtonian viscosity and the range of non-Newtonian flow. The addition of small amounts of bentonite to the PEO solution causes passage to a viscoplastic behavior that manifests itself as the appearance of the yield stress. Therewith, the flow at the highest Newtonian viscosity in the region of low shear stresses (rather than rates) remains possible. After passing through the yield stress, the effect of antithixotropy, i.e., an increase in the viscosity with the deformation rate in a certain shear rate region, has been observed for the multicomponent systems. The data obtained have been interpreted assuming that the addition of the solid filler to the polymer solution destroys the random network of entanglements between macromolecules, while the presence of the polymer in the clay suspension reduces the strength of the coagulation structure of bentonite.
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Original Russian Text © S.O. Ilyin, G.S. Pupchenkov, A.I. Krasheninnikov, V.G. Kulichikhin, A.Ya. Malkin, 2013, published in Kolloidnyi Zhurnal, 2013, Vol. 75, No. 3, pp. 295–302.
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Ilyin, S.O., Pupchenkov, G.S., Krasheninnikov, A.I. et al. Rheology of aqueous poly(ethylene oxide) solutions reinforced with bentonite clay. Colloid J 75, 267–273 (2013). https://doi.org/10.1134/S1061933X13030071
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DOI: https://doi.org/10.1134/S1061933X13030071