Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 10, pp. 1836−1841.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © K.M. Churkina, M.J. Mukhamedzhanova, N.S. Normakhamatov, B.I. Mukhitdinov, A.S. Turaev, 2011, published in Zhurnal Prikladnoi
Khimii, 2011, Vol. 84, No. 10, pp. 1745−1751.
AND POLYMERIC MATERIALS
Rheological Properties of Sulfate Cellulose
K. M. Churkina, M. J. Mukhamedzhanova, N. S. Normakhamatov,
B. I. Mukhitdinov, and A. S. Turaev
Institute of Bioorganic Chemistry of Academy of Sciences of Uzbekistan Republic, Tashkent, Uzbekistan
Received March 25, 2011
Abstract—Rheological properties of concentrated aqueous solutions of sulfate cellulose prepared by various
sulfation methods were studied. Information on the variation of structure of the concentrated solutions under
action of external forces during viscous current depending on sulfate cellulose molecular parameters was obtained.
Sulfated cellulose derivatives are of signiﬁ cant inter-
est for several trades: in drilling industry for creation of
effective chisel solutions; in medicine for development
of antiviral, antimicrobic, and anticoagulant preparations
and soft medicinal forms [1 –3].
Modiﬁ cation of cellulose macromolecules by various
sulfation methods allowing the arrangement of sulfo
groups in β-D-glucopyranose cycles to be regulated dur-
ing etheriﬁ cation will make it possible to form speciﬁ cally
molecular structure of cellulose sulfate and thus to create
an opportunity to obtain substances with a speciﬁ ed set
Methods for synthesizing sulfated cellulose derivatives
offered in [4, 5] allow obtaining samples with adjustable
molecular parameters: molecular weights, molecular-
weight distributions, degrees of sulfate groups replace-
ment, and with directed arrangement of sulfate groups
in an anhydroglucopyranose unit. It was found that the
molecular structure of sulfated cellulose derivatives is
deﬁ ned by preparation methods, which make it possible
to set a necessary structure.
As a rule, sulfated cellulose derivatives are applied in
the form of aqueous solutions of sodium salts of sulfate
cellulose (Na–SC), therefore the study of rheological
properties of concentrated aqueous solutions of such
systems is rather informative owing to their high sensitiv-
ity to variations of the molecular structure of polymeric
matrixes of polysaccharides [6–8].
The aim of the present work was to study rheological
properties of concentrated aqueous solutions of Na–SC
samples synthesized by various sulfation methods with
variation of polymerization and replacement degrees and
also to obtain information on the inﬂ uence of the struc-
ture of Na–SC macromolecules on the structure of their
concentrated solutions under action of external forces.
The following Na–SC samples with equal polymer-
ization degrees (PD) and various replacement degrees
(RD) were studied [4, 5]: (1) Na–SC prepared by a bi-
nary technique with preliminary activation of cotton
cellulose, RD = 1.18, PD = 100; (2) Na–SC synthesized
using a complex compound with preliminary activation,
RD = 1.28, PD = 100; (3) Na–SC synthesized by a binary
method without preliminary activation, RD = 0.9, PD =
140; (4) Na–SC obtained by a suspension technique with
preliminary activation of cotton cellulose, RD = 1.25,
PD = 140. Polydispersiveness of the samples М
Replacement degrees of samples of sulfates were
determined by the gravimetric method (GOST 93-2002)
from sulfur contents.
Molecular weights (MW) and molecular-weight distri-
butions (MWD) were determined by the method of exclu-
sion liquid chromatography on a liquid chromatograph
consisting of a Merk-Hitachi L-6000A plunger pump,
a Shodex RI-101 refractometric detector, a DAWN NSP