Handbook of Size Exclusion Chromatography and Related ...

Figure 5 Concentration dependence of the osmotic pressure of polymer solution in good
solvent and in theta solvent. The dashed line represents the osmotic pressure in the ideal
solution of the same concentration.
to study the effect of the solvent quality on the partitioning of a mixture of short (20
beads) and long (100 beads) chains (16). Figure 6 compares the partition
coefficients KL and KH of short and long chains with a slit of width 6. For reference,
the partition coefficients for a monodisperse polymer in the theta condition are
plotted as dotted lines. Unlike in the good solvent, KL and KH of dotted lines
remain flat until the concentration becomes very high, when the positive third virial
coefficient starts to force the chains into the slit. The same rule applies to the
Figure 6 Partition coefficients KL and KH (solid lines) of short and long chains (20 and
100 beads) in an equal-mass mixture in theta condition with a slit of width 6, plotted as a
function of the total volume fraction of the chains in the surrounding space. The partition
coefficients for solutions of monodisperse polymer are drawn as dotted lines. (From Ref. 16.)
© 2004 by Marcel Dekker, Inc.