1070-4272/03/7611-1835$25.00C2003 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 76, No. 11, 2003, pp. 1835!1838. Translated from Zhurnal Prikladnoi Khimii, Vol. 76, No. 11,
2003, pp. 1886!1889.
Original Russian Text Copyright + 2003 by Amirova, Fomin, Amirov.
AND POLYMERIC MATERIALS
Epoxy Polymers Containing Coordinated
Rare-Earth Metal Ions
L. M. Amirova, V. P. Fomin, and R. R. Amirov
Tupolev Kazan State Technical University, Kazan, Tatarstan, Russia
Kazan State University, Kazan, Tatarstan, Russia
Received May 6, 2003
Abstract-Solid, optically transparent polymers with a high (up to 25 wt %) content of coordination-bound
rare-earth elements were prepared by curing glycidyl esters of phosphorus acids with rare-earth metal salts.
There are two main lines in the use of metal com-
pounds in preparation of epoxy polymers . Salts
and other metal compounds catalyze curing of epoxy
oligomers [1, 2] and can be latent hardeners, e.g., for
preparation of single-component epoxy compounds.
Large amounts of metal ions can improve such proper-
ties of epoxy polymers as adhesion, bending strength,
crack resistance, water absorption, and softening point
[2, 3]. Nevertheless, introduction of metal ions into
epoxy resins is complicated because of low solubility
of their inorganic compounds (oxides, salts). This
problem is usually solved using salts with organic
anions or metal complexes. However, introduction of
noticeable amounts of large organic ions and mole-
cules together with metals can worsen the polymer
parameters and requires special study.
Among metal ions introduced into epoxy polymers,
we can emphasize rare-earth elements (REE). REE-
containing polymers arouse growing interest, which is
caused by the possibility of producing various optical
devices (waveguides, optical amplifiers, lasers) on
their base . The use of epoxides as polymeric
matrices is caused by a set of their favorable physico-
mechanical properties providing good performance.
However, polymers prepared by curing of commercial
epoxy34,4`-isopropylidenediphenol oligomers show
insufficient optical characteristics, softening point,
It was shown previously that polymers based on
glycidyl esters of phosphorus acids (GEP) combine
high physicomechanical and thermal properties and
refractoriness with good optical characteristics .
In addition, phosphoryl groups in GEP molecules can
form additional coordination bonds with multicharged
metal ions (including REE ions), similarly to trialkyl
phosphates, which are well-known extractants .
This suggests the possibility of introducing large
amounts of REE ions into such epoxy polymers.
In this work we studied formation of GEP-based
solid, optically transparent polymers with required
refractive index and high (up to 25 wt %) concentra-
tions of coordination-bound REE ions.
GEPs of the general formula
where R is (OCH
(III), synthesized as in  and analytically pure or
chemically pure grade REE chlorides, nitrates, and
sulfates (Y, Sc, La, Pr, Nd, Gd, Tb, Dy, Ho, Er, Tm,
Yb, Lu) were used.
Glycidyl esters of phosphorus acids were dried by
water distillation in a vacuum for 1 h at 60370oC. The
REE salts were used in the form of crystal hydrates
or dehydrated samples. Polymers were prepared by
stirring at 25oC phosphorus-containing glycidyl ester
with REE salt in 100 : (0.5350) weight ratio (as calcu-
lated for cation content) until the salt completely dis-
solved; curing was performed at 40380oC.
The viscosity of mixtures of REE salt and GEP
was determined according to GOST 10587384 as the
time of outflow of a definite volume of the mixture
through a VPZh-1 viscometer capillary with a diam-
eter from 0.54 to 5.1 mm.