ISSN 1070-4272, Russian Journal of Applied Chemistry, 2017, Vol. 90, No. 1, pp. 70−76. © Pleiades Publishing, Ltd., 2017.
Original Russian Text © E.N. Bykova, I.V. Gofman,
2017, published in Zhurnal Prikladnoi Khimii, 2017, Vol. 90, No. 1, pp. 76−83.
AND POLYMERIC MATERIALS
Effect of Nanosized Carbon Fillers on the Hydrolytic Stability
of Films of a Heat-Resistant Aromatic Polyimide
E. N. Bykova and I. V. Gofman*
Institute of Macromolecular Compounds, Russian Academy of Sciences,
Bol’shoi pr. V.O., 31, St. Petersburg,
Received January 10, 2017
Abstract—The effect of carbon nanoparticles (nanofibers, nanocones/nanodiscs) introduced into a
polypyromellitimide matrix on the stability of the mechanical and thermal characteristics of the resulting
nanocomposite ﬁ lm materials in the course of hydrolysis in aqueous alkali was studied. The nanocomposite ﬁ lms
are less resistant to hydrolysis than the unﬁ lled ﬁ lms of the matrix polyimide. The decreased packing density in
the nanocomposite material is considered to be the major factor responsible for the observed effects. A certain
excess void volume in the nanocomposite appears owing to insufﬁ cient compatibility of the matrix polyimide
with the nanoparticles, manifested in the course of the material preparation.
In the past 10–15 years, there has been a great deal
of interest in preparation and properties of polymer–
inorganic nanocomposite materials. This ﬁ eld of
research covers diverse classes and groups of polymer
materials, from polymer hydrogels to ﬁ lms and blocks
of heat-resistant heterocyclochain polymers [1, 2].
However, along with indubitable success in this
ﬁ eld, many problems still remain to be studied. One of
such virtually unstudied problems is characterization
of the hydrolytic stability of nanocomposite materials
and determination of the character and magnitude of
the inﬂ uence exerted by nanoparticles introduced into
polymer matrices on the stability of the properties of the
resulting materials under the conditions of the action of
active hydrolyzing media. Systematic information on
this matter is virtually lacking. On the other hand, the
problem is of not only purely scientiﬁ c but also applied
importance, primarily for nanocomposites based on
polymers that are known to be resistant to hydrolysis
and are used for fabricating parts of devices that can be
subjected to prolonged action of hydrolyzing agents in
the course of operation.
Aromatic polyimides (PIs) are a group of polymers
exhibiting very high hydrolytic stability [3, 4]. Nano-
composite materials based on polymers of this group are
being studied at our laboratory for already many years.
In view of this fact the study was performed to compare
the hydrolytic stability of nanocomposite ﬁ lm materials
prepared from PIs with that of the ﬁ lms of the corre-
sponding matrix polymers.
As a matrix polymer for preparing nanocomposite ﬁ lms
we chose poly-4,4′-oxydiphenylenepyromellitimide
This polyimide is the most widely used material for
polyimide ﬁ lms (Kapton ﬁ lms  produced by DuPont
and similar ﬁ lm materials from other producers).