ISSN 1070-4272, Russian Journal of Applied Chemistry, 2015, Vol. 88, No. 4, pp. 633−637. © Pleiades Publishing, Ltd., 2015.
Original Russian Text © M.A. Makarova, V.V. Tereshatov, A.I. Slobodinyuk, V.Yu. Senichev, E.R. Volkova, M.S. Fedoseev, 2015, published in Zhurnal Prikladnoi
Khimii, 2015, Vol. 88, No. 4, pp. 601−606.
AND POLYMERIC MATERIALS
Effect of Plasticization on the Stability of the Physicomechanical
Properties of Polyetherurethane in a Humid Medium
M. A. Makarova, V. V. Tereshatov, A. I. Slobodinyuk, V. Yu. Senichev,
E. R. Volkova, and M. S. Fedoseev
Institute of Technical Chemistry, Ural Branch, Russian Academy of Sciences,
ul. Akademika Koroleva 3, Perm, 614013 Russia
Received February 4, 2015
Abstract—The moisture uptake by segmented poly(tetramethylene oxide)urethanes with different content of a
low-polarity plasticizer, di(2-ethylhexyl) sebacate, and the mechanical behavior of these materials in a humid
atmosphere were studied. Plasticization appreciably improves the physicomechanical properties and frost resis-
tance of the microheterogeneous polyurethane. The modiﬁ cation of the polyetherurethane by the low-polarity
plasticizer is advantageous for ensuring high strength characteristics of the elastomer in a humid atmosphere.
The extent of recovery of the polyurethane properties on drying was estimated. The polyurethane plasticized with
di(2-ethylhexyl)sebacate can be used in items operated in highly humid air.
Thanks to high strength and deformation properties,
wear resistance, and resistance to absorption of many
organic solvents, urethane-containing elastomers ﬁ nd
wide use in various branches of industry and in medicine
[1–3]. Some polyurethanes are modiﬁ ed by introducing
functional ﬁ llers [4, 5].
Articles made of microheterogeneous polyurethanes
and polyurethaneureas of block structure, depending on
their destination, can occur in atmosphere of different
humidity or in contact with water. Studies of the
mechanical behavior of polyetherurethaneureas have
shown that their strength characteristics and secant
modulus of elasticity can differ signiﬁ cantly in a humid
medium (by a factor of 1.5–2) .
To enhance the moisture resistance, the partial
replacement of soft polyether blocks (segments) by
nonpolar polydiene segments was suggested. The physi-
comechanical properties of polyurethaneureas with
mixed soft segments only slightly change in a humid
medium, in particular, in contact with water vapor .
However, at moderate air humidity (50–70%), such
materials are appreciably inferior in strength to poly-
urethaneureas with polyether soft blocks only.
The studies of the effect of moisture on the properties
of polyurethane block copolymers, so-called segmented
polyurethanes (SPUs), are limited to data on the properties
of the initial samples (ﬁ lms) and of the samples dried
after moistening . Yang et al.  reported the extension
diagrams of polyurethane samples in the form of cords
after keeping in water at 40°С.
This study deals with variation of the physicomechanical
properties of SPUs with soft poly(tetramethylene oxide)
segments and hard urethane blocks in a humid medium
and with the effect of a low-polarity plasticizer, di(2-
ethylhexyl) sebacate, on the moisture resistance of the
The study was aimed to reveal trends in the mechanical
behavior of SPUs in a wide interval of air humidity and to
enhance the stability of the physicomechanical properties
of the material in a humid medium.
We studied SPUs with poly(tetramethylene oxide) soft
segments, prepared from oligo(tetramethylene oxide)diol
(PTMO) purchased from BASF (99% pure, М ~ 2000),