1070-4272/01/7405-0813$25.00C2001 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 74, No. 5, 2001, pp. 813!817. Translated from Zhurnal Prikladnoi Khimii, Vol. 74, No. 5,
2001, pp. 789!792.
Original Russian Text Copyright + 2001 by Kurenkov, Zaitseva, Vazeeva, Solov’ev.
AND POLYMERIC MATERIALS
Copolymerization of Acrylamide with Salts
of 2-Acrylamido-2-methylpropanesulfic Acid
in Aqueous Solutions as Influenced by the Nature
of Double-Charged Cation
V. F. Kurenkov, O. A. Zaitseva, D. G. Vazeeva, and D. A. Solov’ev
Kazan State Technological University, Kazan, Tatarstan, Russia
Received September 25, 2000
Abstract-The kinetics of copolymerization of acrylamide with magnesium, calcium, and strontium 2-acryl-
amido-2-methylpropanesulfonates in aqueous solutions in the presence of potassium persulfate3sodium hydro-
sulfite initiating redox system at pH 9 and 50oC was studied as influenced by the cation nature.
The radical copolymerization in aqueous solutions
is the main, but still not clearly studied procedure for
preparing copolymers of acrylamide (AA) with salts of
2-acrylamido-2-methylpropanesulfonic acid (H-AMS),
which are widely used in various branches of industry
thanks to their valuable properties [1, 2]. One of the
typical features of copolymerization of the salts of
weak  and strong  unsaturated acids is the
dependence of the kinetic parameters of synthesis
and characteristics and properties of the resulting
polymers on the cation nature . Such dependences
were found previously for polymerization of salts
of H-AMS with single-  and double-charged 
cations, and in the course of copolymerization of AA
with single-charged metal 2-acrylamido-2-methyl-
propanesulfonates . In this work we studied the
kinetics of radical copolymerization of acrylamide
with magnesium, calcium, and strontium 2-acryl-
amido-2-methylpropanesulfonates in water and aque-
ous salt solutions as influenced by the cation nature.
In our work we used acrylamide purchased from
Mitsubishi Chem. Ind. Ltd. (Japan) (mp 84.5oC),
H-AMS purchased from Lubrizol Corp. (Great Bri-
tain) (mp 186oC), distilled water, and other chemical-
ly pure grade reagents. Magnesium, calcium, and
were prepared by neutralization of H-AMS (upon
cooling and mixing) in aqueous solution to pH 9 with
suspensions of Mg(OH)
, and Sr(OH)
respectively, with subsequent filtration of the undis-
solved residue and were used as aqueous solutions.
The procedures of copolymerization, dilatometric
measurements, and tests were presented previously
in . The shift of the meniscus of the reaction mix-
ture in a dilatometer capillary in the course of reaction
was controlled with a KM-8 cathetometer.
After copolymerization the resulting polymers were
precipitated from aqueous solutions into acetone,
filtered off, washed with acetone, and dried to con-
stant weight in a vacuum at room temperature.
The intrinsic viscosity [h] of copolymer solutions
was measured in a 0.5 M NaCl solution at 25oC using
a VPZh-3 viscometer (d
= 0.56 mm).
The content of ionic groups in copolymer was
determined from the content of sulfur .
Copolymerization of AA (M
) with H-AMS salts
) was carried out in concentrated aqueous solu-
]=5315 wt %) at pH 9 and 50oC
with the potassium persulfate (PP)3sodium hydrosul-
fite (SHS) redox initiating system. Variation in the
ionic strengths of solutions m at changing concentra-
tions of the ionic monomer and low-molecular-weight
nonpolymerizing salts does not affect the AA reactiv-
ity, because the rate of its polymerization in aqueous
solutions is independent of salt addition [11, 12].
Solution pH 9 maintained during copolymerization
and utilization of PP initiator provide constant rates
of initiation at changing ionic strength m, because the
rate of PP decomposition in alkaline solutions is in-
dependent of m . Moreover, constant pH 9 provides
high polymerization efficiency of the PP3SHS system