ISSN 1070-4272, Russian Journal of Applied Chemistry, 2006, Vol. 79, No. 8, pp. 1321!1324. + Pleiades Publishing, Inc., 2006.
Original Russian Text + E.N. Popova, A.L. Didenko, V.M. Svetlichnyi, V.E. Yudin, E.A. Kaidash, E.S. Vasil’eva, O.V. Tolochko, D.W. Li, D. Kim, 2006,
published in Zhurnal Prikladnoi Khimii, 2006, Vol. 79, No. 8, pp. 1334!1336.
AND POLYMERIC MATERIALS
Synthesis and Properties of Films of a Polyimide
Filled with Ferromagnetic Nanoparticles
E. N. Popova, A. L. Didenko, V. M. Svetlichnyi, V. E. Yudin, E. A. Kaidash,
E. S. Vasil’eva, O. V. Tolochko, D. W. Li, and D. Kim
Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia
St. Petersburg State Polytechnic University, St. Petersburg, Russia
Korea Institute of Machinery and Materials, Changwon, South Korea
Received March 23, 2006
Abstract-Film-forming polyimide nanocomposites containing 5 to 20 wt % nanoparticles were prepared
from ferromagnetic Fe/Fe
nanoparticles and a polyimide derived from 4,4`-bis(4-aminophenoxy)diphenyl
sulfone and 1,3-bis(3,4-dicarboxyphenoxy)benzene dianhydride. The mechanical properties and magnetization
of the nanocomposite samples were studied in relation to the nanoparticle concentration.
Introduction of nanosized inorganic fillers into
polymers yields novel materials, so-called nanocom-
posites [1, 2]. With the progress of nanotechnologies,
major attention is given to the development of new
nanocomposites based on carbon-containing, metal-
lic, or ceramic nanoparticles. These materials can be
used for preparing protective antifriction coatings,
components for high-frequency magnetic shields, and
articles exhibiting optical, conducting, and other prop-
Polyimides (PIs), thanks to their high mechanical
properties and heat resistance [6, 7], are of particular
interest as a polymeric base for nanocomposites.
Imide-containing magnetic composites filled with
753100-mm magnetic particles (Nd3Fe3B) were pre-
pared by a specially developed procedure involving
synthesis in a melt . This procedure makes it
possible to prepare magnetic plastics at lower tem-
peratures (2203240oC), compared to compacting of
the corresponding polymeric composites at 350oC,
using the powder metallurgy techniques, and to avoid
oxidation of ferromagnetic particles. The use of a new
kind of nanoparticles, magnetic iron nanoparticles in
an oxide shell, will allow preparation of elastic highly
heat-resistant magnetic nanocomposites under the con-
ditions of traditional two-step procedure for synthesis
of polyimides .
The goal of this study was to examine the possibil-
ity of introduction of magnetic iron nanoparticles in
an oxide shell into a polyimide matrix and to analyse
the mechanical and magnetic properties of the result-
ing materials in relation to the filler content.
nanoparticles were prepared by chemical
vapor condensation ; they consist of an iron (Fe)
core encapsulated in a 234-nm-thick magnetite
) shell . These nanoparticles have an ap-
proximately spherical shape with a diameter of 153
25 nm (Fig. 1).
Fig. 1. Photomicrographs of Fe/Fe