Handbook of Solvents - George Wypych - ChemTech - Ventech!

6.2 Equilibrium swelling in binary solvents 323
Figure 6.2.5. Dependence of equilibrium swelling of
PBU on the ϕ 2 value for DEP in the liquid phase (1)
and the φ 2 value inside the gel (1�) swollen in the mixture
DOS-DEP.
uid in the swollen sample and the amount of hexane evaporated. In the case of SL with nonvolatile
components (such as, DBP or DOS) the ratio of SL components in the swollen PBU
was determined by the gas-liquid chromatography, for which purpose toluene extract was
used.
The volume fractions of components 1 and 2 of SL in a liquid phase ϕ 1 and ϕ 2 were calculated
on the basis of their molar ratio and densities ρ 1 and ρ 2 .
Volume fraction of polymer, υ 3, in the swollen sample was calculated from the equation:
υ 3
=
Q V
1
+ 1
where:
QV volume equilibrium swelling of elastomer in SL.
Volume fractions ϕ 1 and ϕ 2 of components 1 and 2 of low-molecular-mass liquids inside
the swollen gel were determined from the equation:
φ
i
υ i
=
1−
υ
3
, ( i = 12 , )
Figure 6.2.6. Dependence of equilibrium swelling of
PBU on the ϕ 2 value for DEP in the liquid phase
(curves 1 and 2) and the φ 2 value inside the swollen gel
(curves 1� and 2�) in the mixtures: 1,1�-hexane(1)-DBM(2),
2,2�- hexane(1)-DBP(2).
where:
φi volume fraction of i-component related to the total volume of its low-molecular-mass part
(not to the total volume of three-component system)
The results of study of sorption of two-component liquids in PBU and in crosslinked
elastomer SCN-26 are shown in Figures 6.2.5-6.2.8, as dependencies of QV on the volume