The concentration dependence of the glass transition temperature Tg of binary polymeric systems, for the Couchman entropic and enthalpic treatments, has been described by taking into account the temperature dependence of the specific-heat increments Acp(T) and the presence of a characteristic temperature To. It is shown that at To the analytical equations undergo a sudden change. Comparison of the equations obtained with a set of experimental data on the poly(vinyl chloride)~libutyl phthalate system appears to be satisfactory. The treatment allows one to characterize a binary system with suitable thermodynamic parameters.
Посилання на статтю:
Peculiarities of the glass transition temperature of binary polymeric systems: entropic and enthalpic treatments / Maria Cristina Righetti and Giuseppe Ajroldi and Giuseppe Marchionni // Polymer. – 1993. – Vol 34. – P. 4307-4313.