1070-4272/04/7706-1028 C 2004 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 77, No. 6, 2004, pp. 1028!1030. Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 6, 2004,
Original Russian Text Copyright + 2004 by Kurbanova.
Influence of Filler on Elastic-Relaxation Properties
of Vulcanized Rubbers Based on Binary Blends
of Diene Rubbers
N. I. Kurbanova
Institute of Polymeric Materials, Azerbaijan National Academy of Sciences, Sumgait, Azerbaijan
Received February 10, 2004
Abstract-The strength and elastic-relaxation properties of vulcanized rubbers based on binary blends of
diene rubbers were studied as influenced by a filler, carbon black no. 330.
The progress achieved in the development of poly-
mer-based multicomponent systems offers virtually
unlimited scope for this line of modification of poly-
meric materials to impart to them the desired prop-
erties . The conditions of preparation and pro-
cessing of blends, as well as introduction of various
additives, also significantly affect the structure and
properties of the resulting materials . Polymer
blends and materials thereof hold much promise and
can find other applications than their constituent po-
lymers [7, 8].
Most of commercial rubber stocks are composed
of an elastomer, a vulcanizing system, and a filler.
Fillers favorably affect the process and physicomech-
anical characteristics, as well as the cost, of the com-
positions, which makes their use essential for poly-
meric materials [2, 5].
In this study, we analyzed how a filler modifies the
properties of binary blends of divinyl (SKD) and sty-
rene-butadiene (SKS) rubbers with polyisoprene (SKI).
We used Carifleks IR 309 (Shell) polyisoprene,
cis-132 (96% cis) SKD, SKS incorporating 23% SRB-
1500 styrene (BSL Olefinverbund GmbH Schkopau),
and carbon black no. 330.
The component ratio (mass fraction) in the com-
positions was as follows: SKD(SKS) : SKI : carbon
black = 50 : 50 : 50; vulcanizing system (mass frac-
tion): sulfur 2.0, stearic acid 2.0, ZnO 3.0, thiuram
0.65, Altax 1.0, Captax 1.25 for SKD/SKI blend and
sulfur 2.0, stearic acid 2.0, ZnO 5.0, Altax 2.75 for
The initial components were mixed in a Banbury
mixer for 6 min in the case of unfilled systems, and
for 7, 10, and 15 min, in the case of filled composi-
The time, s, of introduction of the components into
the mixer was as follows: SKD (SKS) 0, SKI 60, car-
bon black 90 (in three portions), sulfur + stearic ac-
id + ZnO + accelerators 180.
The mixing mode was as follows: T
= 50, T
60365oC; n = 60 rpm. The vulcanization conditions
and modes were specific to each composition.
We studied the physicomechanical properties of
filled and unfilled vulcanizates of the prepared com-
positions under quasistatic and dynamic loading con-
The dynamic mechanical properties of the compos-
itions were studied on a low-frequency (n = 1 Hz) in-
stallation in the sinusoidal oscillation mode at temper-
atures from 3120 to 70oC, and quasistatic properties,
at room temperature at a strain rate of 200 mm min
Table lists the formulations and properties of the
diene rubber-based binary blends (average of five
The most important and widely used filler for vul-
canized rubbers is carbon black. Active fillers tend
to increase the modulus of elasticity, tensile strength,
tear resistance, and wear resistance of vulcanized
Carbon blacks used for rubber filling contain ap-
preciable amounts of chemically bound hydrogen
(0.134%), oxygen (0.231%), and sometimes sulfur
(up to 1%). Carbon black no. 330 or HAF used by
us has a relative strengthening power of 100 at the
specific surface area of 80 m