Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 10, pp. 1842−1846.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © N.I. Kurbanova, N.M. Seidov, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 10, pp. 1752−1756.
AND POLYMERIC MATERIALS
Study of Properties of Vulcanizates of Modiﬁ ed Binary Mixtures
of Polar Rubbers with Polyisoprene
N. I. Kurbanova and N. M. Seidov
Institute of Polymeric Materials, National Academy of Sciences of Azerbaijan, Sumgaiyt, Azerbaijan
Received February 18, 2011
Abstract—Inﬂ uence of a modifying agent (trichloroacetic acid) on strength, elastic relaxation, and thermal
properties of vulcanizates based on binary mixtures of polar rubbers with polyisoprene was studied.
Elastomers occupy one of the important places among
various polymeric materials. Intensiﬁ cation of economy,
necessity of creation of new progressive technologies
and techniques cause necessity of development and cre-
ation of elastomer composites with improved complex
As is known, it is preferable to solve the problem of
creation of composite materials with improved complex
of properties by means of searching for optimal combina-
tions of large-tonnage polymers [1, 2]. The effective way
of obtaining new materials with necessary operational
properties is mixing of two and more polymers [3, 4].
Essential advantage of this technique is the opportunity of
creating composites with a stable complex of properties
exciding traditional mixtures of polymers by a number
of parameters. Conditions for obtaining and processing
mixtures and the introduction of various modifying ad-
ditives are of essential importance for the formation of
their structure and properties [5–8].
It was shown earlier that ﬁ lling agents affect strength,
thermal, and elastic relaxation properties of vulcanizates
of binary mixtures of polar rubbers with polyisoprene .
The present work is devoted to studying the inﬂ uence
of a modiﬁ er on the properties of vulcanizates of binary
mixtures of butadiene–nitrile and bromisobutylele–iso-
prene rubbers with polyisoprene.
In the work we used Cariﬂ ex IR 309 (Shell) poly-
isoprene (SCI); NB 192 HF-grade (BSL Oleﬁ nverbund
GmbH Schkopau) butadiene-nitrile copolymer containing
27% of acrilonitrile (SCN); Polysar 2030 (Bayer) bromi-
sobutylele-isoprene copolymer (BIIC) containing 2% of
bromine, technical carbon (TC) of N330 type, and the
modifying agent: trichloracetic acid (TCAA), mp 58°С.
Initial components were mixed under laboratory con-
ditions in a Brabender Plasticorder mixer (volume 60 cm
initial temperature 50°С, degree of ﬁ lling 0.75) within
6 min for systems without a ﬁ lling agent and within 7,
10, and 15 min for ﬁ lled composites. The composition
and mixing mode (Т
= 50°С, Т
= 60–65°С, n = 60 rpm)
were selected. The vulcanizing system for the mixtures
(party by weight): SCN/SCI, sulfur 1.5, stearic acid 2.0,
zinc oxide 5.0, altax 0.8; BIIC/SCI, sulfurs 2.0, stearic
acid 2.0, zinc oxide 5.0, thiuram 1.3, altax 0.65. The ra-
tio of components in composites (part by weight): SCN
(BIIC) : SCI : TC : TCAA = 50 : 50 : 50 : 5.
Time of introducing components in the mixer (s): SCN
(BIIC) 0, TCAA 60, SCI 120, TC 180 (in parts in three
steps), sulfur + stearic acid + zinc oxide + vulcanization
Conditions of vulcanization for each composite were
determined on a Goettfert elastograph (Т = 145°С). Vulca-
nization of mixtures was carried out in forms 1 mm thick
at 145°С in a Coulin compression moulding machine.
Physicomechanical tests under a quasi-static load-
ing were carried out on a Zwick 1425 tensile-testing
machine at room temperature and deformation rate of
200 mm min