Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 12, pp. 1873−1879.
Pleiades Publishing, Ltd., 2013.
Original Russian Text © E.N. Popova, V.E. Yudin, L.A. Myagkova, V.M. Svetlichnyi, E.A. Tatarinova, A.M. Muzafarov, N.N. Saprykina, V.Yu. Elokhovskii,
G.V. Vaganov, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86, No. 12, pp. 1925−1932.
AND POLYMERIC MATERIALS
Carbon-Reinforced Plastics Based
on Hybrid Polyimide–Organosilicon Binders
E. N. Popova, V. E. Yudin, L. A. Myagkova, V. M. Svetlichnyi, E. A. Tatarinova,
A. M. Muzafarov, N. N. Saprykina, V. Yu. Elokhovskii, and G. V. Vaganov
Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia
Received December 17, 2013
Abstract—Compounds based on the synthesized polyimides and organosilicon resins were developed. The com-
patibility of organosilicon resins with polyimide binders was studied by electron microscopy. The possibility of
preparing ﬁ brous composite materials, carbon-reinforced plastics, using such polyimide–organosilicon binders
was demonstrated. The viscoelastic and strength properties of the materials obtained were studied. The optimum
binder composition, ensuring 90% preservation of the elastic modulus and 70% preservation of strength of the
carbon-reinforced plastic relative to the initial values after keeping in air for 50 h at 350°C, was chosen.
One of priority problems of the modern materials
science is the development of new highly heat-resistant
polymeric binders for composite materials. Polyimides
(PIs) are among the most promising polymers for
electronics and aerospace engineering owing to high
thermal and mechanical characteristics and to high
radiation and chemical resistance . PI-based composite
materials are competitive substitutes for metals and metal
alloys in automobile manufacture, in manufacture of
parts and mechanisms operating at elevated temperatures
and loads, in power engineering for thermal insulation
of nuclear reactors, in fabrication of apparatuses for
chemical industry, and in preparation of heat- and
ﬁ reproof antivibration coatings and of ﬁ reprooﬁ ng ﬁ lm
shields in ﬁ re extinguishing.
Organosilicon resins of type MQ (MQ resins) occupy a
particular place among numerous organosilicon polymers
that are widely used in various branches of engineering
. The abbreviation MQ means combination of mono-
(М) and quatrofunctional (Q) units [3–5]. Despite
high functionality (the mean functionality of such
copolymers usually exceeds 2.5), these resins do not form
macronetworks even upon prolonged keeping at elevated
temperatures. The structure of such copolymers can be
characterized in the general form as highly branched and
polycyclic. It consists of nanosized thickly cross-linked
formations in which further development of the three-
dimensional structure of the macromolecules is restricted
by bulky methyl- and phenylsilyl groups.
The goal of this study was to prepare hybrid binders
that should preserve high mechanical properties in a wide
temperature range by combining heat-resistant polyimide
binders [6, 7] with MQ-type organosoilicon resin.
The properties of the hybrid binders should efﬁ ciently
combine, on the one hand, the resistance of MQ resin to
thermal oxidation and, on the other hand, high mechanical
characteristics of the polyimide binder. Furthermore,
in the composite materials based on the hybrid binders
being developed, expensive PIs are replaced by more
available and relatively cheap MQ resins, which is also
advantageous from the viewpoint of reducing the cost of
the composite material.
The hybrid binders being developed are compounds of
two different prepolymers used in PI synthesis: (a) imide-
containing oligomers with anhydride and N-acylamine
terminal units (IDA), soluble in amide solvents and