Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 5, pp. 894−897.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
Yu.N. Smirnov, E.A. Dzhavadyan, B.A. Komarov, L.M. Bogdanova, V.A. Lesnichaya, A.I. Efremova, B.A. Rozenberg, 2009, published
in Zhurnal Prikladnoi Khimii, 2009, Vol. 82, No. 5, pp. 839−842.
AND POLYMERIC MATERIALS
Modern polymeric composite materials (PCMs)
should exhibit not only high speciﬁ c elastic and strength
characteristics, but also high levels of dynamic and
static fatigue properties, vibration and crack resistance,
and impact resilience, i.e., properties associated with
the capability of a polymeric matrix (PM) and its phase
boundary with a reinforcing material in PCM to dissipate
a mechanical load . For this purpose, PM should exhibit
increased relaxation ability and hence higher molecular
mobility. At the same time, the polymeric matrix should
exhibit high heat resistance (and hence high glass
transition point), which implies decreased molecular
mobility in PM. Therefore, a topical problem in PCM
studies in search for an optimal molecular mobility in
PM with the aim to enhance crack resistance and impact
resilience without a decrease (or with a minimal decrease)
in the heat resistance of PCM.
There are several ways to accomplish this goal .
The most widely used approach consists in decreasing
the defectiveness of PM structural organization by using
individual components or their blends [3–5].
The widely used way to enhance the strength of epoxy
binders is introduction of low-molecular-weight liquids:
plasticizers and antiplasticizers . However, in so doing,
the PM heat resistance considerably decreases. Similar
result can also be attained by introduction into epoxy
binders of rubber additives. The mechanism responsible
for their strengthening effect has been extensively studied
The more promising approach, from the viewpoint of
preserving heat resistance, is introduction of thermoplastic
polymers into a thermosetting matrix [15–18] and
preparation of gradient PMs . Other interesting
approaches are chemical construction of a PM with
a star-shaped structure with several arms originating from
a common center  and use of hyperbranched network
structures , mesomorphic thermotropic polymers
(“molecular composites”), and interpenetrating and
semiinterpenetrating networks [23–25]. This approach
provides wide possibilities for creating heterophase
composites with an optimal size of particles uniformly
distributed in the bulk of the glassy phase.
In this study we examined the possibility of using
polyacrylates for modiﬁ cation of some commercial grades
of heat-resistant epoxy binders with the aim to enhance
their plasticity and crack resistance.
The base binder was ENFB-2M, a commercial product.
As modiﬁ ers we used poly(ether diacrylate) (PEDA) and
its piperazine (PP) adducts synthesized by the Michael
reaction [24, 25]. The modiﬁ ers were synthesized at the
Institute of Problems of Chemical Physics. Depending on
the ratio of functional groups (double bond and amino
Modiﬁ cation of Heat-Resistant Epoxy Matrices
with Acryl-Containing Oligomers
Yu. N. Smirnov, E. A. Dzhavadyan, B. A. Komarov, L. M. Bogdanova, V. A. Lesnichaya,
A. I. Efremova, and B. A. Rozenberg
Institute of Problems of Chemical Physics, Russian Academy of Sciences,
Chernogolovka, Moscow oblast, Russia
Received October 2, 2008
Abstract—With the aim to enhance the crack resistance and impact resilience of heat-resistant epoxy polymeric
matrices for high-strength composites, modification of epoxy resins with new poly(ether acrylates) and their
adducts with amines was studied.