Rheological Properties and Gel Formation
of Aqueous Salt-Containing Solutions
of Sodium Poly(5-vinyltetrazolate)
in the Presence of Cr³⁺ Ions

V. N. Kizhnyaev¹, T. L. Petrova, and A. I. Smirnov

Irkutsk State University,
ul. K. Marksa 1, Irkutsk, 664003 Russia

Received April 24, 2000;
Revised Manuscript Received November 23, 2000

Abstract—The rheological properties of dilute and moderately concentrated aqueous solutions of sodium salt
of poly(5-vinyltetrazole) were studied in the presence of a high content of a low-molecular-mass electrolyte. As
was found, at high ionic strength of aqueous salt-containing solutions (c_s > 2 mol/l), the intrinsic viscosity of
polymer is not a linear function of . A transition from a dilute to moderately concentrated solution takes
place when the concentration of polyelectrolyte is two times higher than the concentration of crossover as esti-
mated from the reciprocal intrinsic viscosity of the polymer. The process of gel formation in aqueous salt-con-
taining solutions of tetrazole-containing polymers in the presence of chromium (III) salts was studied. The min-
imum concentration of polymer at which gel formation takes place coincides with the concentration boundary
of the formation of a fluctuation entanglement network in the initial aqueous salt-containing solution.

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