ISSN 1070-4272. Russian Journal of Applied Chemistry, 2006, Vol. 79, No. 5, pp. 858!860. + Pleiades Publishing, Inc., 2006.
Original Russian Text + M.V. Uspenskaya, N.V. Sirotinkin, V.A. Gorskii, Yu.G. Goloshchapov, 2006, published in Zhurnal Prikladnoi Khimii, 2006,
Vol. 79, No. 5, pp. 870 !872.
Composites of Acrylate Copolymers and Fullerene
M. V. Uspenskaya, N. V. Sirotinkin, V. A. Gorskii, and Yu. G. Goloshchapov
St. Petersburg State University of Information Technologies, Mechanics, and Optics, St. Petersburg, Russia
St. Petersburg State Technological Institute, St. Petersburg, Russia
Received April 22, 2005
Abstract-Preparation conditions of composites of vinylmethyltetrazole3acrylate copolymers with fullerene
were studied. The sorption properties of the composites were studied in relation to the C
Fullerene-containing polymers and composites are
promising materials for medicine, biology, building,
and optics . Materials with required particular
properties can be prepared by modification of the ini-
tial polymer matrix with fillers. Introduction of ful-
lerenes (F) into atactic PMMA affects the thermal
oxidative degradation of the polymer matrix .
Previously we showed that introduction of fuller-
ene into acrylate formulations slightly decreases the
tensile strength of the films but substantially increases
their relative elongation (e~1100%). Data on the
preparation and properties of composites of vinyl-
methyltetrazole3acrylate copolymers with fullerene
are scarce. The aim of this study was to prepare fuller-
ene-containing acrylate composites and to examine
their sorption properties.
Films of composites of vinylmethyltetrazole3acryl-
ate copolymers with fullerene were prepared by radical
polymerization in aqueous solutions at 10360oCin
the presence of the ammonium persulfate (APS)3tetra-
methylethylenediamine initiating system. N,N`-Meth-
ylenebisacrylamide (MBAA) was used as the cross-
linking agent. The degree of neutralization of acrylic
acid a ranged from 0.1 to 0.9. The polymerization
was performed at the initial monomer concentration
of 10357%, the concentration of 2-methyl-5-vinyl-
tetrazole (MVT) of 0365 wt % of the weight of acryl-
ic acid (AA), and the concentration of the cross-link-
ing agent of 030.9 wt % of the total monomer weight.
The properties and purification procedures of other
chemicals and the procedures for preparing com-
posites and studying their sorption properties were
reported previously . The composites were prepared
in aqueous solutions in 8315 h.
Solid fullerene (C
) was introduced with stirring
in the first polymerization step. Since the composite is
heterogeneous, the fraction of the unchanged modifier
was determined gravimetrically after swelling of the
composite in distilled water for 537 days.
The preparation conditions and some properties of
composites of new vinylmethyltetrazole3acrylate co-
polymer with fullerene are presented in the table. It is
seen that the copolymer yield decreases and the gela-
tion onset time increases with increasing the fullerene
concentration in the reaction mixture. This fact sug-
gests that fullerene inhibits the initiation of the free-
radical copolymerization . It should be noted that
the copolymer yield increases with increasing the
AA concentration in the initial monomer mixture.
The kinetic curves of swelling of composites of
vinylmethyltetrazole3acrylate copolymers with fuller-
ene, prepared at different concentration of the cross-
linking agent, are shown in Fig. 1a. The equilibrium
swelling of these composites with different fullerene
content is attained within 5310 h, which is significant-
ly faster than the time required for equilibrium swel-
ling of vinylmethyltetrazole3acrylate hydrogels with-
out the modifier.
As seen from Fig. 1a, the equilibrium swelling of
the absorbing composites decreases with increasing
the concentration of the cross-linking agent. This is
due to shortening of the polymer segment between
the cross-links of the polymeric network.
The kinetic curves of swelling of the fullerene-con-
taining acrylate composites with different modifier
content are shown in Fig. 1b. As seen from Fig. 1b,