The adsolubilization of styrene, isoprene, and mixtures of styrene
and isoprene into cetyltrimethylammonium bromide (CTAB) bilayers (admicelles) on precipitated silica is
investigated. The results show
that the styrene adsolubilization constant is nearly unchanged with
increasing styrene equilibrium
concentration in the aqueous phase, while the isoprene adsolubilization
constant increases with increasing
isoprene partial pressure. The adsolubilization constants suggest
that styrene adsolubilizes into both the
palisade layer and the core of the admicelle, while isoprene
adsolubilizes into the palisade layer. In the
co-monomer system styrene adsolubilization is slightly increased in the
presence of isoprene but isoprene
adsolubilization is significantly enhanced in the presence of styrene;
however, the adsolubilization isotherms
of both monomers have increasing slopes in the co-monomer system and
show that there is a synergistic
effect, possibly due to swelling of the admicelle due to the addition
of adsolubilizate.
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