RHEOLOGICAL PROPERTIES AND CONCENTRATION CROSS-OVERS OF POLYACRYLAMIDE AND ANIONIC (CO)POLYMERS OF АCRILAMIDE IN AQUEOUS-SALT SOLUTIONS

Rheological properties and concentration cross-overs of nonionic polyacrylamide and anionic acrylamide copolymers in saline solutions (sodium and potassium chlorides) of different concentration (0.07 and 3.4 mol/l) were investigated using the capillary viscometer method. It is shown that increasing the content of ionic groups of macromolecules reduces crossover concentration. The area of non-overlapping coils between the crossover concentration and the concentration of fluctuation mesh formation was determined for polyelectrolytes; it was shown that with increasing salt concentration this area practically disappears, i.e. the mass transfer mechanism changes near crossover concentration as in the saline solution of nonionic polyacrylamide. An effective volume of polymer macromolecules is higher in the sodium chloride solution than in the potassium chloride solution; for polyelectrolytes, it is higher than for nonionic polymers and grows with increasing the number of ionic groups of polyelectrolyte macromolecules.

1. Semchikov Yu. D. High molecular weight compounds. Moscow, Academy Publ., 2003. 368 p. (in Russian)

2. Tager А. А. Physics-chemistry of polymers. Moscow, Nauchnyi mir Publ., 2007. 573 p. (in Russian)

3. Holmberg K., Iensson B., Kronberg B., Lindman B. Surfactants and polymers in aqueous solutions. Moscow, Chemistry Publ., 2007. 528 p. (in Russian)

4. Orleneva A. P., Korolev B. A., Litmanovich A. A., Zaharova Yu. A., Kasaikin V. A., Kulichikhin V. G. Features of rheo-logical behavior of aqueous poly-N,N-dimethyldiallylammonium chloride solutions. Vysokomolekulyarnye soedineniya = Polymer Science, Series A Physics, 1998, vol. 40, no 7, pp. 1179–1185 (in Russian).

5. Syaduk G. V., Litmanovich E. A. Rheological properties of aqueous solutions of ultra high molecular weight polyacrylamide. Struktura i dinamika molekulyarnyh system [Structure and dynamics of molecular systems], 2003, iss. Х, p. 1, pp. 184–186 (in Russian).

6. Butyrskaya E. V., Shaposhnic W. A., Butyrskii A. M. The comparative analysis of lithium and potassium hydraten shells structures. Vestnik Voronezhskogo gosudarstvennogo universiteta. Seriya: Khimiya. Biologiya. Farmatsiya = Proceedings of Voronezh State University. Series: Chemistry. Biology. Pharmacy, 2004, no. 2, pp. 25–27 (in Russian).

7. Vorobieva E. V., Soldatov V. S. Adsorption of polyacrylamide and its ionogen copolymers on kaolin from solt solutions. Doklady Natsional’noi akademii nauk Belarusi = Doklady of the National Academy of Sciences of Belarus, 2012, vol. 56, no. 1, pp. 87–92 (in Russian).

8. Armstrong J. K., Wenby R. B., Meiselman H. J., Fisher T. C. The hydrodynamic radii of macromolecules and their effects on red blood cell aggregation. Biophysical Journal, 2004, vol. 87, no. 6, pp. 4259–4270. doi.org/10.1529/biophysj.104.047746

9. Grosberg A. Yu., Hohlov A. R. Phisics in the word of polymers. Moscow, Nauka Publ., 1989. 208 p. (in Russian).

10. De Zhen P. Scaling concepts in polymer physics. Cornell University Press, 1979. 324 p.

11. Tako N., Brown W., Johnsen M., Stepanek P. Dynamic behavior of Θ solutions of polystyrene investigated by dynamic light scattering. Macromolecules, 1990, vol. 23, no. 4, pp. 1165–1174. doi.org/10.1021/ma00206a040

12. Shulyak I. V., Grushova E. I., Semenchenko A. M. Rheological properties of aqueous solutions of polyethylene glycols with various molecular weights. Russian Journal of Physical Chemistry A, 2011, vol. 85, no. 3, pp. 419–422. doi.org/10.1134/ s0036024411030265

13. Nefedov V. G., Atapin A. G. Phenomenological research of viscosity and density of hydroxide alkaline metal solutions. Vostochno-evropeiskii zhurnal peredovykh tekhnologii = Eastern-European Journal of Enterprise Technologies, 2015, no. 78, pp. 27–33 (in Russian).