Mg. Baschetti et al., Solubility in glassy polymers: Correlations through the nonequilibrium lattice fluid model, IND ENG RES, 40(14), 2001, pp. 3027-3037
The representation of solubility isotherms of gases and vapors in glassy po
lymers has been analyzed through the use of a thermodynamic model, nonequil
ibrium lattice fluid, recently introduced. The possible use of the model as
a predictive tool for gas solubility in glassy polymers has been discussed
in previous works for the special cases in which the polymer density in ps
eudoequilibrium conditions is known from experimental measurements. In this
paper, a different use of the model is presented in which the polymer dens
ity at different sorption conditions is not known from direct experimental
measurements and is thus treated as a correlation parameter, following the
typical linear dilation isotherm. The solubility isotherms thus obtained by
the model have been compared with several experimental data, obtaining a r
ather satisfactory representation of the sorption isotherms, through use of
two fitting parameters, at most.