Preparation of Macroporous Styrene – Divinyl Benzene Copolymers
Engineering and Technology Journal,
2007, Volume 25, Issue 9, Pages 1041-1048
AbstractSuspension polymerization technique is used for the preparation of
macroporous Styrene – Divinylbenzene (S-DVB) copolymer beads with
different mole percent of divinylbenzene content in the presence of different
contents and types of diluents which gives the porosity to the copolymer. It
was found that increasing the percent of DVB with fixing the amount of
toluene diluent (72%) results in a decrease in toluene regain (T. R.) values
with increasing the degree of porosity. Increasing the percent of diluent with
fixing the amount of DVB (16%) results in an increase in (T. R.) values with a
decrease in the degree of porosity. Changing the type of diluent also has an
effect on the physical properties of the prepared copolymer. Addition of
polystyrene with toluene results in an increase in the degree of porosity. The
other physical properties of the copolymer, apparent density and void fraction
are also measured.
These copolymers are used as the base for the preparation of porous
cation exchangers (by sulfonation) and anion exchangers (by
chloromethylation and amination) under controlled experimental conditions.
The physical properties of the prepared ion exchangers were also measured,
with total exchange capacity (T. E. C.) and the rate of ion exchange (t1/2).
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