1070-4272/04/7708-1386 C 2004 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 77, No. 8, 2004, pp. 1386!1387. Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 8, 2004,
Original Russian Text Copyright + 2004 by Kositskii, V.Yudovich, M.Yudovich, Ponomarev.
Influence of Fulleroid Nanoparticles (Astralenes)
on Absorption of Water by Epoxy Resin
D. V. Kositskii, V. M. Yudovich, M. E. Yudovich, and A. N. Ponomarev
Astrin-Kholding Private Company, St. Petersburg, Russia
Received April 29, 2004
Abstract-Water absorption by ED-20 epoxy resin modified with fullerid nanoparticles, astralenes, was
studied as influenced by the modifier content.
Epoxy resins, epoxy-acrylic copolymers, and their
composites are used in electrical engineering and ra-
dioelectronic industry, aircraft construction, shipbuild-
ing, and mechanical engineering. These materials are
also used in building industry as components of pot-
ting and impregnation compounds, adhesives, sealants,
and binders of reinforced plastics. The adhesion of
epoxy resins to most of fillers, supports, and reinforc-
ing fibers is high. Epoxy adhesives are among the best
known polymers in the adhesive strength. Cured ep-
oxy resins have good mechanical properties, low
shrinkage, and high chemical resistance.
Since polymeric epoxy composites are used in large
(usually multilayer) power and insulating structures,
water absorption of the epoxy matrix should be esti-
mated. It should be noted that the strength and elastic
modulus decrease by 15!20% and the glass transition
point substantially decreases at water absorption of
Fig. 1. Typical polyhedral multi-layer particle 150 nm long
with internal slit capillary. Scale 1 : 1; the same for Fig. 2.
5!8 wt % . The dielectric properties of polymeric
composites used for electrical and radio engineering
purposes are strongly deteriorated by water absorption.
Epoxy matrices with water absorption of no higher
than 1% are the most promising for preparing modern
polymeric and composite structures .
In this study, we examined the modification of
ED-20 epoxy-4,4<-isopropylidenediphenol resin with
astralene carbon nanoparticles to decrease its water
We used astalenes, carbon fulleroid nanoparticles,
 as the modifier.
A typical polyhedral multilayer particle 150 nm
long with internal slit capillary is shown in
Fig. 1. Similar particles are shown in Fig. 2. Their
Fig. 2. General view of dispersed astralenes.