Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 4, pp. 688−690
Pleiades Publishing, Ltd., 2009.
Original Russian Text
V.S. Solov’ev, M.V. Uspenskaja, Yu.N. Bel’shina, 2009, published in Zhurnal Prikladnoi Khimii, 2009, Vol. 82, No. 4, pp. 691−693.
Study of Physical and Mechanical Properties and Combustibility
of Filled Acrylate Compositions
V. S. Solov’ev, M. V. Uspenskaja, and Yu. N. Bel’shina
St. Petersburg University of State Fire Engineering Service, Ministry of Emergency
Situations of Russia, St. Petersburg, Russia
Received August 27, 2008
Abstract—Compositions based on cross-linked acrylate copolymers and bentonites were obtained. Physical-
mechanical and absorption characteristics of bentonite-polymeric composite materials were studied. The effect
of a filling agent on the final product properties was demonstrated. The possibility of using these compositions
for creating materials with reduced combustibility was shown.
Bentonites represent clay-like materials which are
mainly used for the preparation of drilling fluid, in
agriculture, in industry as a basis of hydraulic insulating
materials and adsorbents for reﬁ ning waste and process
waters, in household chemistry, in reﬁ ning petroleum
derivatives, etc. [1−3]. Bentonites are natural moisture
absorbents, i.e. materials capable to absorb and keep an
amount of water 14−16 times greater that the weight of the
sample itself. It is known that when a free swelling space
is limited, a strong gel hindering the further moisture
inﬁ ltration is formed. Thus, the use of bentonite as a ﬁ lling
agent in the composition of a polymeric matrix should
promote strengthening the polymeric matrix and also
reducing combustibility of materials based on it.
The aim of this work was to create polymeric
compositions with improved physical and mechanical
characteristics and reduced combustibility on the basis of
cross-linked acrylate copolymers and bentonite.
In this work we obtained composites with acrylic
hydrogel used as a polymeric matrix and Na−Ca bentonite
(I) of various concentrations as a ﬁ lling agent. The
acrylic copolymer was obtained on the basis of acrylic
acid (II) and acrylamide (III) in the weight ratio (II)
: (III) = 70 : 30. The compositions were synthesized
by the radical polymerization in an aqueous medium
at 50°C. We used the system ammonium persulfate–
tetramethylethylenediamine as the initiator and N, N'-
methylenebisacrylamide as the cross-linking agent. The
degree of neutralizing III was α = 0.9. The polymerization
was carried out at the initial concentration of monomers
30, of the cross-linking agent 0.3 wt %. The time of the
synthesis of the compositions in the aqueous medium
was 0.5−5 h.
The physical-mechanical and absorption characteristics
were studied according to the standard procedures .
The equilibrium swelling degree of polymeric
compositions was measured by a standard gravimetrical
method and calculated by the equation:
Q = (m
is the mass of the swollen sample (g), and m
the mass of the dried up sample (g).
In calculations the results of measuring swelling of
ﬁ ve analogous samples were averaged.
Combustibility was investigated on a KT instrument
consisting of a ceramic hot-fire camera.
composite samples were subjected to conditioning
according to GOST 12423-66. By means of a rotameter
The experiments were carried out at St. Petersburg University of
State Fire Engineering Service, Ministry of Emergency Situations