  In part I of this contribution we have reported how the Flory-Huggins
interaction parameter chi can be modeled as a function of chain length within
the composition range of pair interaction between the macromolecules by means
of the three parameters alpha, zeta and lambda. This contribution presents the
extension of the approach to arbitrary volume fractions of the polymer and its
application to published data. The resulting equation is simple and requires
only the additional parameter ny to incorporate the composition dependence. Its
employment to experimental data is very much facilitated by substituting for
the limiting value of chi at infinite dilution. Furthermore the expression can
in good approximation be simplified such that only two parameters need to be
adjusted. This relation is capable of describing all types of composition
dependencies reported in the literature, including the hitherto
incomprehensible occurrence of pronounced minima. For a given system the
evaluation of the chain length dependence of chi at high dilution reported in
part I, and the present evaluation of the composition dependence of chi yield
the same values for the conformational response zeta. Similarly both types of
measurements generate the same interdependence between zeta and alpha. The
physical meaning of the different parameters and the reason for the observed
correlations are discussed.
