ISSN 1070-4272, Russian Journal of Applied Chemistry, 2008, Vol. 81, No. 9, pp. 1634!1637. + Pleiades Publishing, Ltd., 2008.
Original Russian Text + A.B. Glazyrin, M.I. Abdullin, N.A. Kochkov, R.V. Karmanov, S.T. Burtan, N.V. Shaikhutdinov, 2008, published in Zhurnal
Prikladnoi Khimii, 2008, Vol. 81, No. 9, pp. 1559!1562.
AND POLYMERIC MATERIALS
Polymer!Asphalt Compounds Based on 1,2-Polybutadienes
A. B. Glazyrin, M. I. Abdullin, N. A. Kochkov, R. V. Karmanov,
S. T. Burtan, and N. V. Shaikhutdinov
Bashkir State University, Ufa, Bashkortostan, Russia
Received April 9, 2008
Abstract-Properties of polymer3asphalt compounds containing 1,2-polybutadienes differing in the molec-
ular weight and structure of macromolecules were examined. Introduction of syndiotactic 1,2-polybutadiene
in combination with a plasticizing additive noticeably improves the main service properties of asphalts.
A promising way to improve the quality of road
pavements is the use of asphalts in combination with
various polymers. Polymer3asphalt binders (PABs),
compared to common road asphalts, provide higher
quality of road pavement and its longer service life.
The most widely used agents for modifying
asphalts are butadiene3styrene block copolymers
 which are thermoelastoplastics, i.e., they com-
bine high elasticity with the capability to pass into
a viscous-flow state at elevated temperatures, simi-
larly to thermoplastics.
1,2-Polybutadiene produced by stereospecific
polymerization of butadiene in solution is also a
thermoelastoplastic [4, 5]. Its production is now
being commercialized by the Russian chemical
In this study we examined the effect of 1,2-poly-
diene on the physicomechanical properties of road
We used 1,2-polybutadienes differing in the
molecular weight and structure of macromolecules:
(1) high-molecular-weight syndiotactic 1,2-polybuta-
diene (SPB), M
52.6 0 10
, degree of syndiotacticity
53%, melting point T
105oC, glass transition point
318oC, degree of crystallinity 18%; (2) low-molec-
ular-weight atactic 1,2-polybutadiene (LPB), M
8.35 0 10
, degree of polydispersity 1.98, content of
1,2 units in macromolecules 70.5%, viscous resinous
product, dropping point 54oC.
To prepare polymer3asphalt compounds, we used
BND-90/130 road asphalt produced by Kichui Oil
Refinery and Ufaneftekhim Joint-Stock Company.
Polymer3asphalt binders were prepared by mixing
the components at 1403150oC . The physico-
mechanical properties of asphalts and polymer3
asphalt binders were determined by standard pro-
cedures. As reference we used Kraton D-1101 buta-
diene3styrene thermoplastic widely used as PAB
component in road paving.
Introduction of 2 wt % SPB into asphalt leads to
a noticeable (by 14319%) decrease in the needle pen-
etration depth at 25 and 0oC (Table 1, Fig. 1), char-
Fig. 1. Influence of composition of the asphalt compound
on its properties. (X) Parameter value. (1) Needle penetra-
tion depth at 0oC, 0.1 mm units; (2) ring-and-ball soften-
ing point, oC: (3) extensibility at 25oC, cm; and (4) inter-
val of working temperatures, oC. (I) Initial asphalt,
(II) asphalt + 2% SPB, (III) asphalt + 3% SPB, (IV) as-
phalt + 3% SPB + 6% I-40A oil, and (V) level prescribed