ISSN 1070-4272, Russian Journal of Applied Chemistry, 2007, Vol. 80, No. 11, pp. 1898!1901. + Pleiades Publishing, Ltd., 2007.
Original Russian Text + E.O. Kazyuka, A.P. Polikarpov, I.G. Poplevka, Yu.I. Matusevich, L.B. Yakimtsova, L.P. Krul’, 2007, published in Zhurnal
Prikladnoi Khimii, 2007, Vol. 80, No. 11, pp. 1874 !1877.
AND POLYMERIC MATERIALS
Thermal Properties of Copolymerization Products
of Methyl Methacrylate with Methacrylamide
E. O. Kazyuka, A. P. Polikarpov, I. G. Poplevka, Yu. I. Matusevich,
L. B. Yakimtsova, and L. P. Krul’
Belarussian State University, Minsk, Belarus
Research Institute of Physicochemical Problems, Belarussian State University, Minsk, Belarus
Institute of Physical Organic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus
Received April 10, 2007
Abstract-Radical copolymerization of methyl methacrylate and methacrylamide was studied. For polymer
films prepared from acetic acid solutions, the heat resistance and thermomechanical behavior were evaluated,
and adhesion to silicate glass was determined.
Much attention is given today to the development
and improvement of optical information technologies,
because their capabilities with respect to the informa-
tion transfer rate and information content and to the
performance of separate components are significantly
higher as compared to microelectronics . Among
the materials for recording and treatment of optical
information, exhibiting high optical transparency in
the visible region and relative stability of the recorded
information in a wide temperature range, various
polymers, e.g. polymethyl methacrylate (PMMA), are
of particular importance [23 4]. However, low thermal
and adhesion properties hindering their use in optical
recorders operating in contact with silicate glass at
elevated temperatures are the main disadvantages of
the materials based on PMMA.
Modification of PMMA by copolymerization of
methyl methacrylate (MMA) with polar monomers,
yielding polymers with a higher softening point [5, 6],
is one of solutions of this problem. Methacrylamide
(MAA)  and acrylic acid  were studied as such
polar monomers. Kuo et al.  examined in detail
the composition of the copolymerization products of
MMA and MAA and the dependence of the glass
transition point (DSC data) on the content of meth-
acrylamide units in the copolymer. However, there are
no data on changes in the other thermal properties of
PMMA on passing to the copolymerization products
of MMA and MAA and on the adhesion properties of
the resulting copolymers.
In this study we examined the heat resistance and
the thermomechanical and adhesion properties of
the products of MMA and MAA copolymerization.
The radical copolymerization of MMA and MAA
was performed in a 40% solution of the monomer
mixture in acetone at 57oC for 5 h in the presence of
2,2`-azobis(isobutyronitrile) (AIBN) initiator taken in
an amount of 0.2% with respect to the monomer
weight. The MAA : MMA molar ratio was varied
from 1 : 4 to 3 : 2, i.e., the mole fraction of MAA in
the monomer mixture a was varied from 0.2 to 0.6.
The synthesis was carried out in a three-necked
flask equipped with a mechanical stirrer with a
hydraulic lock and a reflux condenser. A weighed
portion of MAA was dissolved in acetone at 40oC
with continuous stirring, and then freshly distilled
MMA was added. The mixture was heated to 55oC,
and the required amount of the initiator was added.
The reaction began in 10315 min, which was con-
firmed by formation of a precipitate after addition
of an aliquot of the reaction mixture into ethanol.
Simultaneously, the viscosity of the reaction mixture
increased. After heating for 5 h, the reaction mixture
was cooled and the reaction products were reprecipi-
tated from acetone with water and additionally washed
The homopolymerization of MMA and MAA was
also performed in a 40% monomer solution in acetone