1070-4272/05/7805-0811C2005 Pleiades Publishing, Inc.
Russian Journal of Applied Chemistry, Vol. 78, No. 5, 2005, pp. 811!814. Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 5,
2005, pp. 827!830.
Original Russian Text Copyright + 2005 by Bondar’, Hong Je Kim, Yong Jin Lim.
AND POLYMERIC MATERIALS
Radiation-Induced Graft Polymerization of Glycidyl
Methacrylate onto Nonwoven Polypropylene
Yu. V. Bondar’, Hong Je Kim, and Yong Jin Lim
Institute of Environmental Geochemistry, Kiev, Ukraine
Received September 27, 2004; in final form, March 2005
Abstract-The influence of the major grafting parameters (irradiation dose, reaction time, and inhibitor
concentration) on graft polymerization of glycidyl methacrylate from its 10% solution in methanol onto
nonwoven polypropylene upon irradiation with an electron accelerator in air was studied.
Graft polymerization is an efficient method of
modification of polymeric substrates. Economically
efficient and environmentally clean radiation tech-
nologies, e.g., radiation-induced graft polymeriza-
tions, offer a number of undoubted advantages .
In particular, this method allows controlled introduc-
tion into an inert polymeric matrix of polymeric
chains with functional groups and preparation of
polymeric adsorbents (chemisorption fibers, fabrics,
films) of the desired form and with varied concentra-
tion of ion-exchange groups. Functional groups can be
introduced both by one-step radiation-induced graft
polymerization of the appropriate monomers and by
grafting of precursor monomers, followed by polymer-
analogous reactions. In view of a limited number of
accessible vinyl monomers with functional groups,
the second option, in particular, grafting of glycidyl
methacrylate (GMA), a vinyl monomer containing
epoxy groups, showed much promise.
Radiation-induced (co)polymerization of GMA, as
well as of other vinyl monomers, follows the chain
radical mechanism, involving the double bonds, while
epoxy rings remain fairly inert and contribute only
slightly to formation of cross-links . At the same
time, the well-known  high reactivity of the epoxy
rings of GMA in nucleophilic substitution reactions
makes GMA a promising precursor monomer.
Radiation-induced graft polymerization and the
subsequent modification of epoxy rings in GMA,
aimed at preparation of adsorbents thereof, were ac-
tively studied by Saito, Kim, et al. . Their
technique included irradiation of the polymeric sub-
strate with an electron accelerator in a nitrogen
atmosphere up to a dose of 200 kGy, grafting of GMA
chains in a 10% solution of GMA in methanol at
313 K, preparation of samples with the degree of
grafting of 200% , and subsequent polymer-analogous
reactions involving the epoxy rings.
More extensive information about the features of
grafting GMA chains onto various polymeric sub-
strates can be found in papers by Choi et al. .
They studied how the experimental parameters, name-
ly, irradiation dose, monomer concentration (GMA3
1,4-dioxane solution), temperature, and time of reac-
tion affect the degree of graft polymerization of GMA
upon irradiation of a polymeric substrate (
in air. However, both research teams examined
the influence of the experimental parameters only on
the degree of graft polymerization of GMA chains
(increase, in per cent, of the weight of the sample
upon grafting). Therefore, we can only indirectly
judge the efficiency of both grafting and conversion of
the epoxy groups in GMA into functional groups
during the subsequent polymer-analogous reactions.
In this study we examined how the major param-
eters of graft polymerization of GMA onto nonwoven
polypropylene (PP) upon irradiation with an electron
accelerator in air affect graft polymerization and re-
presented the results as the plots of the density of
grafted GMA chains vs. the degree of grafting.
As a polymeric base for grafting GMA chains
served nonwoven material from PP fibers, available
from Saehan Filter Co Ltd, with an average thickness
of 2 mm and density of 4.6 010
polymerization was performed by the pre-irradiation
method . Irradiation was carried out in an ELV-04
conveyor accelerator by a 1-MeV electron beam. After
irradiation, the fabric was kept in a desiccator at room
temperature, and polymerization was carried out with-