Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 8, pp. 1380−1384.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
V.V. Tereshatov, V.N. Strel’nikov, M.A. Makarova, V.Yu. Senichev, E.R. Volkova, 2010, Vol. 83, No. 8, pp. 1274−1278.
Structure and Properties of Segmented Polyurethane–Ureas
with Dissimilar Soft Blocks
V. V. Tereshatov, V. N. Strel’nikov, M. A. Makarova,
V. Yu. Senichev, and E. R. Volkova
Institute of Technical Chemistry, Branch, Russian Academy of Sciences, Perm, Russia
Received October 29, 2009
Abstract—Structure and properties of segmented polyurethane–ureas with mixed nonpolar and polar soft segments
were studied. Advantages of elastomers based on mixtures of oligobutadiene and oligoether diisocyanates in
providing high strength properties combined with frost resistance are demonstrated.
The wide use of segmented polyurethanes (SPUs) in
industry, building, and medicine are due to the possibility
of control over properties of materials and articles
based on these compounds. Properties of SPUs strongly
depend on the chemical structure of the oligomers used,
concentration of hard blocks, and their solubility in the
soft phase of a polymer [1, 2].
A promising and as yet insufﬁ ciently developed way
to control the structure and properties of polyurethane
elastomers without synthesis of new compounds is
by using mixtures of variable-composition oligomers
for producing these elastomers [3–6]. Of particular
interest in this case are materials with polar and low-
polar (or nonpolar) soft segments. For example,
thermodynamically incompatible oligoether diiso-
cyanate with M
≈ 1400 and oligodivinylisoprene
diisocyanate with M ≈ 4000 used for synthesis yield
a macroheterogeneous elastomer with an extremal
dependence of the strength and deformation properties
on the mixture composition and high frost resistance of
the material . The wide range in which its properties
can be controlled is provided by properties of elastomers
with individual soft segments. Also possible in this case
is a nonadditive effect of the component composition
of the polyurethane formulation on the properties of the
This communication reports on a study of the
structure and properties of segmented polyurethane–
ureas (SPUUs) with thermodynamically compatible
mixed polybutadiene and polyether soft segments and
urethane–urea hard blocks. The main goal of our study
was to enable control over physicomechanical properties
of nonplasiticized and plasticized polyurethane–ureas
with mixed soft blocks, with high frost resistance of
these materials provided.
We synthesized SPUUs with mixed soft segments from
prepolymers produced by reacting the corresponding
oligomeric diol with 2,4-toluylene diisocyanate taken
in a twofold excess: oligobutadiene prepolymer SKU-
DF-2 with M ≈ 2400, oligo(tetramethylene oxide)diol
prepolymers with M ≈ 1700 (PP-1) and M ≈ 2100 (PP-
3), and oligo(propylene oxide)diol prepolymer (PP-2)
with M ≈ 1350. The molecular masses of the oligomeric
diols used to obtain the above prepolymers were about
2000, 1350, 1750, and 1000, respectively. The molecular
masses of the prepolymers and oligodiols were evaluated
by the content of functional groups.
Mixtures of prepolymers were cured with methylene-
bis-ortho-chloroaniline (MOCA). Elastomers based on
prepolymer mixtures of SKU-DF-2 with PP-1 and SKU-
DF-2 with PP-2 were obtained using molten MOCA.