Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 8, pp. 1390−1393.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
V.I. Budnikov, V.V. Sinkin, V.N. Strel’nikov, 2010, Vol. 83, No. 8, pp. 1284−1287.
A Study of Water-Sorption Characteristics
of Filled Acrylic Copolymers
V. I. Budnikov, V. V. Sinkin, and V. N. Strel’nikov
Institute of Technical Chemistry, Ural Branch, Russian Academy of Sciences, Perm, Russia
Received March 11, 2010
Abstract—Water-sorption properties of hydrophilic acrylic copolymers with a 3D network structure, ﬁ lled with
biodegradable components, were studied. The effect of pressure and pH of the swelling medium on the water
absorption by the ﬁ lled copolymers was analyzed.
Hydrophilic acrylic copolymers with a 3D network
structure ﬁ nd use in various industries, medicine,
cosmetics, manufacture of toiletry, and solution of
some ecological and agrotechnical problems [1–4].
Application of hydrophilic copolymers in plant
cultivation as water-retaining materials makes it possible
to reduce water expenditure by a factor of 1.5–2, helps
plants to be more stable against climatic stresses, and
alleviates consequences of possible breakdowns in the
irrigation technology . In Russia, wide use of these
materials in agriculture and in planting of urban and
industrial landscapes is hindered by their high cost. One
of the most effective ways to diminish the cost of water-
retaining materials is to use biodegradable ﬁ llers serving
as an additional source of plant feeding.
Various ﬁ llers are widely employed to modify
and control the water-absorbing properties of acrylic
copolymers used for various purposes [6–9]. However,
there have hardly been any studies aimed to develop
ﬁ lled acrylic materials for plant cultivation.
It has been shown previously [10–13] that acrylic
copolymers ﬁ lled with solid waste from plants for
biocatalytic production of acrylamide can be obtained
for use as water-retaining materials in plant cultivation.
Nevertheless, the inﬂ uence exerted by the degree of
copolymer ﬁ lling, pressure, and pH of the swelling
medium on water-sorption properties of these materials,
which could enable a substantiated estimation of their
efﬁ ciency, remain insufﬁ ciently studied.
The aim of this study was to examine water-
sorption properties of copolymers based on acrylamide
and ammonium acrylate, ﬁ lled with biodegradable
An acrylic copolymer based on acrylamide and
ammonium acrylate served as the polymeric substrate.
The ratio between acrylamide and ammonium acrylate
was 50 : 50 mol %; content of the cross-linking agent
(methylenebisacrylamide), 0.2 mol % relative to the sum
of monomers; initiating system, ammonium persulfate
+ sodium sulﬁ te. As biodegradable ﬁ llers served waste
from woodworking plants (sawdust, wood ﬂ our, wood
dust from air cleaning facilities, etc.) and solid waste
from plants for production of acrylamide (biocatalyst
slurry, which is a mixture of separate cells, cell
agglomerates, and auxiliary mineral ﬁ ltering materials).
The ﬁ ller content c
was up to 25% for ﬁ nely dispersed
wood and up to 38% for the biocatalyst slurry, relative
to the mass of the materials obtained. The fraction
composition of the ﬁ llers was 0.045–0.5 mm.
Filled formulations were produced by mixing
of acrylic monomers and ﬁ llers at a temperature