ISSN 1070-4272, Russian Journal of Applied Chemistry, 2006, Vol. 79, No. 11, pp. 1869!1874. + Pleiades Publishing, Inc., 2006.
Original Russian Text + B.A. Zhubanov, V.D. Kravtsova, R.F. Mukhamedova, K.Kh. Bekmagambetova, 2006, published in Zhurnal Prikladnoi Khimii,
2006, Vol. 79, No. 11, pp. 1890 !1895.
AND POLYMERIC MATERIALS
New Polymer Systems Based on Alicyclic Polyimides
B. A. Zhubanov, V. D. Kravtsova, R. F. Mukhamedova, and K. Kh. Bekmagambetova
Bekturov Institute of Chemical Sciences, Ministry of Education and Science of Kazakhstan Republic,
Almaty Institute of Power Engineering and Communications, Almaty, Kazakhstan
Received March 24, 2006
Abstract-Specific features of modification of some alicyclic polyimides with polyamido acids derived from
aromatic tetracarboxylic acid dianhydrides were studied. The possibility of preparing new polymer systems
with improved characteristics was demonstrated.
Recently there has been a considerable progress in
modification of polymers with various additives and
fillers. A promising approach to the development of
new polymeric materials with high physicomechanical
characteristics and good processability, including
materials based on polyimides, is blending of poly-
mers belonging to the same or different classes [13 4].
Published papers mainly concern aromatic poly-
imides. At the same time, alicyclic polymers are also
of interest for various branches of engineering. In par-
ticular, they are promising materials for multilayer
dielectrics in stacks of multiintegrated circuits, for
production of enameled wires, film insulators, etc.
. However, these polymers, as compared to the
aromatic analogs, exhibit insufficiently high physico-
mechanical characteristics. These characteristics can
be improved by modification with various polymers.
The main goal of this study was to examine specif-
ic features of modification of polyimides containing
tricyclodecene fragments in the backbone with poly-
amido acids derived from aromatic tetracarboxylic
The starting compounds and solvents were purified
by standard procedures. The IR spectra were recorded
on an IR-25 spectrometer. Polymer samples were pre-
pared as 335-mm films.
The reduced viscosities of 0.5% solutions of the
polyimides were measured with an Ubbelohde vis-
cometer at 25oC in dimethylformamide (DMF). Ther-
mogravimetric analysis of the polymers was per-
formed with a TGA SDTA Mettler Toledo device at
a heating rate of 8 deg min
. The temperatures of the
onset of the polymer decomposition (T
) were cal-
culated from the TGA curves.
The physicomechanical (tensile strength, relative
elongation) and dielectric (dielectric loss tangent,
permittivity) characteristics were studied under stand-
ard conditions by known procedures [9, 10].
Dianhydrides were prepared by the Diels3Alder
reaction upon UV irradiation of saturated solutions of
maleic anhydride in appropriate hydrocarbons in the
presence of acetophenone as sensitizer. Tricyclo-
]dec-7-ene-3,4,9,10-tetracarboxylic acid di-
anhydride (photoadduct of benzene and maleic an-
hydride, AB) was prepared in a temperature-controlled
quartz glass vessel by irradiation of a solution of
196.00 g (2.0 mol) of maleic anhydride in 1000 ml of
benzene containing 24.12 g (0.2 mol) of acetophenone
with a PRK-2M mercury quartz lamp for 15 h. In the
course of irradiation, a white crystalline precipitate
formed; it was filtered off, recrystallized from prop-
ionic anhydride, washed with dry diethyl ether, and
vacuum-dried at 80390oC to constant weight. Yield
80% based on maleic anhydride.
boxylic acid dianhydride (photoadduct of furan and
maleic anhydride, AF) was prepared by irradiation of
the monoanhydride prepared beforehand from furan
and 193.24 g (2.0 mol) of maleic anhydride, performed
for 10 h in 1000 ml of dioxane containing 24.12 g
(0.2 mol) of acetophenone. Yield of AF 84.5%.