Abstract
Nonionic polyacrylamide with the weight-average molecular mass of 7 MDa was modified by sulfomethylation. The composition of sulfomethylated polyacrylamides was determined by iodometric titration, Fourier IR spectroscopy, thermal gravimetric analysis, and elemental analysis. The sulfomethylated acrylate polymers containing ≥19.9 mol % sulfo groups are resistant to brines containing up to 70 g L–1 CaCl2 at temperatures of up to 140°С and to hydrothermal treatment at 180°С. As shown by capillary turbulent rheometry under the conditions of thermal, salt, and acid aggressions, at the optimum concentrations of sulfomethylated polyacrylamide in the medium, с opt = 0.025–0.085%, the maximal extent of a decrease in the hydrodynamic resistance, DRmax, remains on the level of 71–80%, and the flow rate increment, ΔQ, is on the level of (22.01–28.85) × 10–6 m3 s–1.
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Original Russian Text © A.I. Nechaev, I.I. Lebedeva, V.A. Val’tsifer, V.N. Strel’nikov, 2017, published in Zhurnal Prikladnoi Khimii, 2017, Vol. 90, No. 8, pp. 1096−1103.
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Nechaev, A.I., Lebedeva, I.I., Val’tsifer, V.A. et al. Antiturbulent properties of sulfomethylated polyacrylamide under the conditions of thermal, salt, and acid aggressions. Russ J Appl Chem 90, 1357–1364 (2017). https://doi.org/10.1134/S1070427217080274
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DOI: https://doi.org/10.1134/S1070427217080274