Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 4, pp. 718−722.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
O.A. Cheremisina, V.V. Popov, N.V. Sirotinkin, V.G. Korsakov, M.M. Sychev, 2010, published in Zhurnal Prikladnoi Khimii, 2010,
Vol. 83, No. 4, pp. 666−670.
AND POLYMERIC MATERIALS
Conducting Polymeric Composites Based
on Butadiene–Acrylonitrile Latex
O. A. Cheremisina
, V. V. Popov
, N. V. Sirotinkin
, V. G. Korsakov
, and M. M. Sychev
St. Petersburg State University of Service and Economics, St. Petersburg, Russia
Surel Limited Liability Company, St. Petersburg, Russia
St. Petersburg State Institute of Technology (Technical University), St. Petersburg, Russia
Received June 16, 2009
Abstract—The possibility of controlling the physicochemical and electric properties of conducting latex
composites based on butadiene–acrylonitrile latex and carbon ﬁ llers, using data on the content of active centers
on the ﬁ ller surface and their distribution with respect to donor–acceptor properties, was examined. To make the
ﬁ llers compatible with the latexes and prevent their coagulation, the ﬁ llers were modiﬁ ed with Leukanol.
Conducting polymeric composites (CPCs) are objects
of active theoretical and experimental research, which
is due to the possibility of their wide practical use for
manufacturing of conducting adhesives, ﬂ exible circuit
strips, and conducting layers for electroluminescent light
sources [1–3]. The commonly used ﬁ llers for CPCs are
carbon black of various grades and dispersed graphite
[4, 5]. A promising line in the technology of production
of conducting polymeric composites is the use of latexes
instead of solutions of rubbers in organic solvents.
This allows the use of expensive and toxic solvents to
be abandoned and problems with their utilization or
regeneration to be eliminated.
To implement this approach, it is necessary to
ensure compatibility of conducting ﬁ llers with aqueous
dispersions of polymers, which can be attained by
modiﬁ cation of the ﬁ llers with surfactants. In this study we
examined the possibility of controlling physicochemical
and electric properties of conducting latex composites
(CLCs) based on butadiene–acrylonitrile latex and
modiﬁ ed carbon ﬁ llers.
In our study we used BN-30K-2 butadiene–acrylo-
nitrile latex stabilized with Sulfonol. The conducting
ﬁ llers were furnace (PM-80E) and channel (K354)
carbon black (CB) and S-1 colloidal graphite preparation.
To modify carbon material, we used NF dispersant
(Leukanol), a product of condensation of formaldehyde
with β-naphthalenesulfonic acid. The dispersity of the
ﬁ llers was determined by turbidimetry [6, 7].
The surface properties of ﬁ llers were characterized
by distributions of donor–acceptor centers, which were
determined by adsorption of acid–base (Hammett)
indicators with spectrophotometric recording. The
content of active centers q
in relation to the
dissociation constant рK
center distribution, “ACD spectra” } was
determined in the рK
range from –4.4 to 12.8. Lewis
base centers correspond to the interval of рK
to 0, Brønsted acid centers, to the interval from 0–7, and
Brønsted base centers, to the interval from 7 to 12.8. The
surface acidity function was determined by the formula
, where Σq
is the total content
of centers of all types. The characteristics of the surface
are given in the table.
To prevent the destabilization and coagulation
of latexes, ﬁ llers before introduction into the latex
were converted into a pasty form by dispersing them
in an aqueous surfactant solution in a ball mill. The
suspensions had the following concentrations (wt %):