Activity coefficients fl~, Flory interaction parameters X °~ for solutions of Nylon-6/e-caprolactam (CPL), toluene and ethylbenzene at temperatures ranging from 250 to 290°C have been obtained from inverse gas chromatography retention data. The estimated vapour pressure of the cyclic dimer of CPL at 280-300°C has also been determined. From this data the vapour pressure versus composition curves for Nylon-6/CPL and Nylon-6/dimer solutions at various temperatures have been plotted. The experimental data of activity coefficient of CPL in Nylon-6 are shown to be in very good agreement with those calculated by the UNIFAC-free volume model.
Посилання на статтю:
Thermodynamic studies on Nylon-6/solvent systems by inverse gas chromatography at elevated temperatures / Luisa Bonifaci*, Gianfranco Cavalca, Donatella Frezzotti,Edgardo ialaguti, Gian Paolo Ravanetti // Polymer. – 1992. – Vol 33. – P. 4343-4346.