ISSN 1070-4272, Russian Journal of Applied Chemistry, 2007, Vol. 80, No. 1, pp. 93!101. + Pleiades Publishing, Ltd., 2007.
Original Russian Text + V.N. Pavlyuchenko, O.V. Sorochinskaya, S.Ya. Khaikin, S.P. Fedorov, E.A. Sosnov, S.S. Pesetskii, S.S. Ivanchev, 2007, published
in Zhurnal Prikladnoi Khimii, 2007, Vol. 80, No. 1, pp. 94!102.
AND POLYMERIC MATERIALS
Organic!Inorganic Cross-Linked Structures Prepared
from Reactive n-Butyl Methacrylate!3-(Trimethoxysilyl)propyl
V. N. Pavlyuchenko, O. V. Sorochinskaya, S. Ya. Khaikin, S. P. Fedorov, E. A. Sosnov,
S. S. Pesetskii, and S. S. Ivanchev
St. Petersburg Branch, Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences,
St. Petersburg, Russia
St. Petersburg State Technological Institute (Technical University), St. Petersburg, Russia
Belyi Institute of Mechanics of Metal!Polymer Systems, National Academy of Sciences of Belarus,
Received November 22, 2006
Abstract-The features of formation of organic3inorganic cross-linked structures prepared by copolymeriza-
tion of n-butyl methacrylate with 3-(trimethoxysilyl)propyl methacrylate, followed by hydrolysis of the tri-
methoxysilane groups of the copolymers and condensation of the resulting silanol groups, were studied.
The quantitative composition of the functional groups of the cross-linked copolymers was determined.
The physicomechnaical and mechanical properties of the copolymers were studied in relation to the copolymer
composition and conditions of hydrolytic condensation.
Cross-linking polymer systems containing reactive
oligomers and polymers are conventionally used for
preparing films, coatings, and polymer articles by
so-called reaction molding. The advantage of this
process is that cross-linking of the polymer and mold-
ing of the article are combined in one step, with the
three-dimensional cross-linked structure of the poly-
mer improving the mechanical, thermal, and other
properties of the article.
This approach was widely used mainly in thermo-
setting systems prepared by the polycondensation
mechanism. At the present time, copolymers with dif-
ferent functional groups (hydroxy, carboxy, epoxy,
etc.) are used for preparing cross-linked systems.
Usually low-molecular-weight cross-linking additives
are introduced into these systems, i.e., these systems
are [double-packed composites] since the cross-link-
ing agent can be introduced into the reaction mixture
only prior to its use, which is inconvenient for in-
dustrial processes. Systems cross-linked without
cross-linking additives, or more precisely, by cross-
linking agents contained in the environment, are more
promising. For examples, reactive copolymers with
isocyanate functional groups are cross-linked under
the action of atmospheric moisture. The disadvantage
of isocyanate systems is their high toxicity. More at-
tractive in this respect are copolymers with alkoxy-
silane functional groups cross-linked by the following
=SiOR + HOH 6=SiOH + ROH,
=SiOH + =SiOH 6=SiOSi= + HOH,
=SiOH + =SiOR 6=SiOSi= + ROH,
to form organic and inorganic (=SiOSi=) cross-links.
These copolymers are used for preparing organic3in-
organic cross-linked structures from epoxy resins ,
polyurethanes , and polycarbonates . Condensa-
tion cross-linking of polymers involves at least three
steps: polycondensation of the monomer to obtain
the oligomer; addition of alkoxysilane fragment to the
terminal groups of the oligomer using functionalized
trialkoxysilanes; and cross-linking of the system by
Hybrid cross-linking polymerization is simpler
from the technological point of view, since prepara-
tion and functionalization of the polymer are com-