Handbook of Solvents - George Wypych - ChemTech - Ventech!

326 V V Tereshatov, V Yu. Senichev, E Ya Denisyuk
Figure 6.2.10. Experimental data and calculated dependence
of equilibrium fraction of components υ 1 (1),
υ 2 (2), and υ 3 (3) in PBU sample swollen in the hexane-DBP
mixture on the ϕ 2 value for DBP in the liquid
phase: lines - calculation, points - experimental.
Figure 6.2.11. Dependence of equilibrium fraction of
components υ 1 (1), υ 2 (2), and υ 3 (3) in SCN-26 sample
swollen in the amyl acetate-DMP mixture on the
ϕ 2 value for DMP in the liquid phase: lines - calculation,
points - experimental.
where:
m the index for the maximum of
sorption.
e
χ12 the value, calculated from the
equation [6.2.8], substitutes χ12 from the Eqs. [6.2.6] and [6.2.7]
The results of calculations are presented
as dependencies of volume fractions, υ1, υ2,
and υ 3 of the triple system components
(swollen polymer) vs. the volume fraction ϕ2 (or ϕ1 ) of the corresponding components of
the liquid phase (Figures 6.2.10 and 6.2.11).
For practical purposes it is convenient to represent
the preferential sorption as the dependence
of equilibrium composition of a binary
Figure 6.2.12. Dependence of equilibrium φ2 value on liquid (a part of the swollen gel) vs. composi-
the ϕ 2 value in the liquid phase: 1-amyl acetate
(1)-DMP (2)-SCN-26(3), 2-hexane(1)-DBM(2)-PBU tion of the liquid phase. These calculated de-
(3), 3-nonane(1)-TBP(2)- PBU (3); lines - calculation, pendencies (solid lines) and experimental
points - experimental.
(points) data for three systems are given in
Figure 6.2.12. The results of calculations
based on AUL, are in the satisfactory agreement with experimental data.
Hence the experimentally determined equality of concentrations of SL components in
the swollen gel and in the liquid phase allows one to predict composition of liquid, whereby
polymer swelling is at its maximum, and the preferential sorption of components of SL. To
refine dependencies of φ1 on ϕ1 or φ2 on ϕ 2 , correction can be used, for example,
minimization of the square-law deviation of calculated and experimental data on the total