ISSN 1070-4272, Russian Journal of Applied Chemistry, 2008, Vol. 81, No. 11, pp. 2021–2025. © Pleiades Publishing, Ltd., 2008.
Original Russian Text © L.U. Bazaron, S.A. Stel’makh , 2008, published in Zhurnal Prikladnoi Khimii, 2008, Vol. 81, No. 11, pp. 1906–1910.
of Polyhexamethyleneguanidine Hydrochloride
L. U. Bazaron and S. A. Stel’makh
Baikal Institute of Nature Management, Siberian Branch, Russian Academy of Sciences, Ulan-Ude, Buryatia, Russia
Received November 27, 2007
Abstract—Synthesis in a hexamethylenediamine–guanidine hydrochloride melt was carried out at different
monomer ratios and synthesis temperatures.
(PHMG) prepared by polycondensation in a hexame-
thylenediamine (HMDA)–guanidine hydrochloride
(GHC) melt  is a water-soluble polymer containing
amino groups, which makes it suitable as antiseptic
, fungicide, and flocculant for removing iron from
potable water . Good water solubility, coupled with
lack of odor and of aggressiveness towards various
materials and with film formation capability, is respon-
sible for wide application of this polymer in national
economy. At the same time, the relationships in forma-
tion of the macromolecules of this polymer and its
structure are poorly understood.
In this study we elucidated the conditions of forma-
tion of the PHMG macromolecules by polycondensa-
tion of bi- and trifunctional monomers and also deter-
mined the constants for the Mark–Kuhn–Houwink
solution, followed by drying to constant weight.
Linear polymers and sol fractions of selected sam-
ples were fractionated chromatographically. To this
end, we used a 1 m × 10 mm glass column packed with
Sephadex-G-50. The column top was filled with 20%
solution of the polymer, and the fractions were eluted
with distilled water supplied until exhaustive washing
of the polymer out of the column. Fractionation
yielded from 10 to 15 fractions; the loss was estimated
The intrinsic viscosities of the sol fractions were
determined in a suspended-level capillary Ubbelohde
viscometer  at the thermostat temperature of 25 ±
0.05°С. Because of polycationic nature, the synthe-
sized samples exhibit the polyelectrolyte effect in vis-
cosity measurements, i.e., a nonlinear concentration
dependence of the reduced viscosity. To suppress the
polyelectrolyte effect, we used NaCl solutions with
different ionic strengths as solvents (Fig. 1).
AND POLYMERIC MATERIALS
The polycondensation reaction between bifunc-
tional HMDA and trifunctional GHC monomers al-
lowed changing, along with the synthesis temperature
and time, the reactant ratio, from equimolar to stoi-
chiometric. The synthesis temperature was varied from
165 to 250°С. Gembitskii et al.  showed that ammo-
nia ceases to evolve 9 h after the start of the reaction,
and this time was chosen as the polycondensation time.
The polymers synthesized were dissolved in distilled
water and filtered through a Schott filter no. 4; the re-
sulting gel was dried in a desiccator to constant weight.
The concentration of the soluble fraction of the poly-
mer was determined by vaporization of 2 ml of the
Fig. 1. Reduced viscosity η
/с, of PHMG in aqueous
NaCl solutions with different ionic strengths vs. NaCl
concentration c. (1) Pure water, (2) 0.2 N NaCl, (3) 0.3 N
NaCl, (4) 0.4 N NaCl, and (5) 0.5 N NaCl.
, dl g
c, g dl