Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 10, pp. 1631−1635.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © S.A. Galadzhev, S.N. Zuev, L.Ya. Tsarik, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85, No. 10, pp. 1704−1708.
AND POLYMERIC MATERIALS
Suspension Copolymerization of Styrene and Divinylbenzene
in the Presence of Stabilizers (Starch and Gelatin)
S. A. Galadzhev, S. N. Zuev, and L. Ya. Tsarik
Irkutsk State University, Irkutsk, Russis
Received July 21, 2011
Abstract—The procedure for preparing spherical particles of copolymers of styrene and technical-grade divinyl-
benzene in the presence of stabilizers (starch and gelatin) added to improve the process parameters was examined
with the aim to develop a process for production of gel ion-exchange resins.
Published data are available on suspension copolymer-
ization of styrene (ST) with divinylbenzene (DVB) in the
presence of polyvinyl alcohol  or methyl methacry-
late–methacrylic acid copolymer as suspension stabilizer.
Egorov et al.  reported on suspension copolymerization
of ST with p- and m-DVB, aimed to prepare ion exchang-
ers for analytical purposes. The experiment lasted for 5 h
and more . With the aim to prepare copolymers used
in production of gel ion-exchange resins, Komarov et al.
 performed suspension copolymerization of styrene
and divinylbenzene in dispersion media based on starch,
polyvinyl alcohol, and boric acid . The effect of stir-
ring and addition of suspending agents on the suspension
properties was examined. A change in the viscosity was
attributed to the particle size and, probably, to the degree
of their coalescence: With an increase in the particle size,
the degree of coalescence increases . A procedure was
suggested for preparing microspherical ST–DVB copoly-
mers using starch and gelatin as suspension stabilizers .
The goal of this study was to examine the effect of
stabilizers (starch and gelatin) on the yield and size of
microspherical particles and to apply the procedure for
copolymerization of technical-grade DVB to copolymer-
ization in solvents.
Synthesis of microspherical particles of copolymers
of styrene and technical-grade divinylbenzene. Styrene
was puriﬁ ed by vacuum distillation after destabilization
with 1 N NaOH; bp 34°C/1.3 kPa, n
grade DVB after destabilization with 1 N NaOH was
puriﬁ ed by distillation to remove hydroquinone, which
is added to technical-grade DVB as polymerization in-
hibitor; bp 51–55°C/0.64 kPa. According to GLC data,
the composition of the monomer mixture was as follows
(wt %): m-DVB 26.7, p-DVB 12.0, m-ethylstyrene 34.3,
p-ethylstyrene 13.8, m-diethylbenzene 6.5, p-diethyl-
benzene 3.3, and ST 3.4. To prepare the microspherical
copolymer, we used a mixture consisting of 30 wt %
technical-grade DVB and 70 wt % styrene. As initiator
we used benzoyl peroxide taken in an amount of 3 wt %
relative to the sum of the monomers. The initiator was
puriﬁ ed by recrystallization from chloroform, mp 100°C.
The suspension stabilizers were soluble starch [GOST
(State Standard) 10163–62] and photographic grade
gelatin. Copolymerization of styrene and divinylbenzene
was performed in reactors of two types, made of VT-1
In a 0.1-l reactor equipped with a two-blade propeller
stirrer, at a rotation rate of 23.4 s
, we obtained particles
having mostly a size of 30 to 60 μm. In the other, 3-l reac-
tor, to enhance the stirring intensity, we used a four-blade
propeller stirrer arranged in a diffuser. The stirrer rota-
tion rate was 46.8 s
. The particle size of the copolymer
obtained was 3 to 10 μm.