ISSN 1070-4272, Russian Journal of Applied Chemistry, 2006, Vol. 79, No. 12, pp. 2013!2015. + Pleiades Publishing, Inc., 2006.
Original Russian Text + L.M. Trufakina, 2006, published in Zhurnal Prikladnoi Khimii, 2006, Vol. 79, No. 12, pp. 2037!2039.
AND POLYMERIC MATERIALS
Viscoelasticity and Surface Properties of Blends of Aqueous
Solutions of Polyvinyl Alcohol and Carboxymethyl Cellulose
L. M. Trufakina
Institute of Petroleum Chemistry, Siberian Division, Russian Academy of Sciences, Tomsk, Russia
Received January 24, 2006
Abstract-Rheological properties of aqueous solutions of carboxymethyl cellulose, polyvinyl alcohol, and
of their blends prepared under various conditions (temperature, concentration, time) were studied by viscom-
etry and of ball indenter penetration.
Complexation of a polymer with another polymer
or with a low-molecular-weight compound is of great
practical interest  since this modification changes
the physical properties of the polymer without chem-
Among blends of water-soluble polymers, gels of
polyacrylamide , polyacrylic acid and cellulose
ethers and esters , polysaccharide and polyvinyl
alcohol , etc. have been studied in detail.
The conditions of formation of polymer complexes,
their rheological and surface properties, and the ki-
netics of formation and degradation of the complexes
are required for their successful application.
At present the rheological approach is widely used
as the most powerful tool to estimate the kinetics of
formation of physical networks in polymer blends.
The aim of this study was to examine the varia-
tion of the rheological and surface properties of poly-
mer complexes with time. The results of this study
can be used to assess the possibility of storage and
estimate the storage temperature and the shelf life
of these composites.
The polymer complexes were prepared from water-
soluble flexible-chain polyvinyl alcohol (PVA) and
rigid-chain carboxymethyl cellulose (CMC).
The molecular weight M of PVA in distilled wa-
ter at 20oC, calculated by the equation [h] = 5.6 0
, is 2.2 0 10
. The molecular weight
of CMC in 0.1 N NaCl, calculated by the equation
[h] = 7.3 0 10
, is 3.67 0 10
The dynamic viscosity of the polymer solutions
was measured on Rheotest-2 rotary viscometer with
a cylinder-cylinder working unit at shear rates of 1.5
to 1312 s
. The viscosity and shear stress of aque-
ous solutions of the polymers are listed in the table.
The critical concentrations c
of the crossovers of
PVA and CMC are 5 and 6%, respectively.
The polymer blends were prepared by the proce-
dures described in our previous study . The viscos-
ity and the shear stress of the polymer complexes
were measured on a rheoviscometer with a cone-plate
working unit at shear rates of 0.56 to 4860 s
When solutions with the polymer concentrations
close to the critical values (43 8 wt %) were used,
the properties of the polymer blend substantially
The structure formation rate in the PVA-CMC sys-
tem was estimated, as influenced by the concentration,
Dynamic viscosity and shear stress of aqueous solutions
of CMC and PVA at T =20oC
, ³ h, ³ t, º c
, ³ h, ³ t,
wt % ³ Pa s ³ Pa º wt % ³ Pa s ³ Pa
4 ³ 0.175 ³ 28.45 º 4 ³ 0.14 ³ 22.76
5 ³ 0.561 ³ 91.04 º 5 ³ 0.21 ³ 34.14
6 ³ 0.597 ³ 96.73 º 6 ³ 0.31 ³ 51.21
7 ³ 0.667 ³ 108.1 º 7 ³ 0.42 ³ 68.28
8 ³ 0.772 ³ 125.1 º 8 ³ 0.56 ³ 91.04