Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 4, pp. 712−717.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
A.M. Bochek, I.L. Shevchuk, L.M. Kalyuzhnaya, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83, No. 4, pp. 655−659.
AND POLYMERIC MATERIALS
Properties of Aqueous Solutions of Blends of Polyvinyl Alcohol
with Carboxymethyl Cellulose Ionized to Various Extents
A. M. Bochek, I. L. Shevchuk, and L. M. Kalyuzhnaya
Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia
Received May 25, 2009
The rheological properties of dilute and moderately concentrated aqueous solutions of blends of
polyvinyl alcohol with carboxymethyl cellulose ionized to various extents were studied. The thermodynamic
compatibility of solid polymer blends was studied by the method of solvent vapor sorption, and the inﬂ uence
of the amount of non-neutralized carboxy groups in carboxymethyl cellulose on its compatibility with
polyvinyl alcohol was examined.
It is known that one of the ways to improve service
properties of polymers is their modiﬁ cation with other
polymers [1, 2]. Mixing of two polymers in a common
solvent allows preparation of polymeric composite
materials with controllable properties differing
signiﬁ cantly from those of the components. In so doing,
it is not necessary to perform chemical modiﬁ cation of
polymers or to prepare new complex macromolecular
Aqueous solutions of cellulose ethers and esters
are widely used in various branches of human activity.
Among cellulose ethers containing ionogenic groups,
the most widely used is carboxymethyl cellulose (CMC)
produced in the form of sodium salt (NaCMC). The
rheological properties of its aqueous solutions and the
properties of ﬁ lms obtained from them can be modiﬁ ed
by varying the degree of ionization of the polyelectrolyte
or by adding into solutions another water-soluble
Polyvinyl alcohol (PVA) is among the most widely
used synthetic water-soluble polymers. It is soluble
not only in water, but also in organic solvents [8, 9].
By introducing PVA into other polymers, it is possible
to vary the rheological properties of blends and the
deformation–strength characteristics of the resulting
composite materials [10–14]. Modiﬁ cation of aqueous
solutions of CMC ionized to various extents by adding
PVA solutions and evaluation of the thermodynamic
compatibility of the polymers in the solid state are of
scientiﬁ c and practical interest.
In this study we examined the viscosity characteristics
of dilute and moderately concentrated aqueous solutions
of blends of PVA with CMC ionized to various extents
and the thermodynamic compatibility of the polymers in
the solid state.
We used commercial NaCMC samples with the
degree of substitution (DS) of 0.5 and molecular weight
of 77450 and PVA with the molecular weight of 67350
and degree of hydrolysis of 98%. As solvent we used
The molecular weight of PVA was determined
viscometrically from the intrinsic viscosity of PVA
in distilled water, using the relationship [η] = 6.66 ×
. The molecular weight of NaCMC was
determined from the intrinsic viscosity of the polymer in
a 6% NaOH solution, using the relationship [η] = 7.3 ×
The degree of substitution of NaCMC was calculated
from the Na content as follows :