Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 5, pp. 825−829.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © E.S. Okhotnikova, T.N. Yusupova, Yu.M. Ganeeva, I.N. Frolov, G.V. Romanov, 2012, published in Zhurnal Prikladnoi Khimii, 2012,
Vol. 85, No. 5, pp. 826−830.
AND POLYMERIC MATERIALS
Optimization of the Composition of Bitumen–Polymer
Compounds Based on Bitumens
with Various Disperse Structures
E. S. Okhotnikova, T. N. Yusupova, Yu. M. Ganeeva, I. N. Frolov, and G. V. Romanov
Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientiﬁ c Center, Russian Academy of Sciences,
Kazan, Tatarstan, Russia
Received November 21, 2011
Abstract—Optimal concentrations of the mixed polyoleﬁ n modiﬁ er of TPM grade, necessary for introduction into
bitumens with various disperse structures for obtaining bitumen–polymer compounds meeting the GOST (State
Standard) requirements to rooﬁ ng materials, were determined. The role of the crystalline phase of the polyoleﬁ n
in determination of the quality of bitumen–polymer compounds was examined.
Wide use of oxidized bitumens in production of
rooﬁ ng materials and low level of plastic properties of
these substances require the development of scientiﬁ cally
substantiated approaches to preparation of the materials
with extended interval of plasticity, including the materials
with polymeric additives. Mixed thermoelastoplastics are
a relatively new class of polymeric modiﬁ ers. These
materials are physical blends of thermoplastics and
elastomers, combining the advantages of both classes. It
was shown  that the mechanism of the action of a mixed
modiﬁ er depends on the disperse structure of the bitumen
raw material. In bitumens forming structured disperse
systems, the mixed polyoleﬁ n modiﬁ er is distributed in
the dispersion medium as separate globules. In bitumens
with the free disperse structure, a coagulation structure of
modiﬁ er components is formed with preservation of the
supramolecular structures of resin–asphaltene substances.
It should be noted that, for bitumen–polymer compounds
(BPCs) with a mixed modiﬁ er, in contrast to those with
polyoleﬁ n  and SBS-type  modiﬁ ers, the optimal
structure parameters and the minimal content of the mixed
modiﬁ er in the compound, required for obtaining high-
quality polymeric materials, have not been determined
up to now.
To determine the optimal formulations of BPCs based
on bitumens of various disperse structures, we examined
the technological characteristics and the structure of
compounds with various amounts of the mixed modiﬁ er.
As investigation objects we chose BN 90/30, BND
60/90, and BNK 40/180 bitumens of the gel, sol–gel, and
sol structures, respectively. As modiﬁ er we used commer-
cially available mixed polyoleﬁ n thermoelastoplastic of
TPM grade, produced in accordance with TU (Technical
Speciﬁ cation) 2211-001-93056915-2006 (composition:
polyethylene, SKEPT rubber, industrial oil). The content
of the TPM modiﬁ er in the compound varied from 3 to
15 wt % for the sol–gel- and sol-type bitumens and from
3 to 7 wt % for the gel-type bitumen. The technological
characteristics of the bitumens and BPCs are given in
Table 1 and Fig. 1.
The structural-rheological properties were studied
with a Rheotest-2 device with a coaxial cylindrical unit.
Rheological studies were performed in the shear rate