GROUP-CONTRIBUTION ENTROPIC EQUATION FOR SIMULATING THE PROPERTIES OFPOLYMER-SOLUTIONS

A group-contribution entropic equation is used to predict the activiti es of low-molecular-weight components in multicomponent polymer system s with chemical conversions. The change in free volume on mixing is in cluded by introducing the mole fraction of the free volume. The residu al member is taken into account in terms of the UNIFAC equation. Fourt een binary and multicomponent systems containing the products of synth esis of styrene and acrylonitrile-butadiene-styrene polymers are studi ed. The activities calculated from the equation of interest are compar ed with experimental data and the values calculated from the UNIFAC-FV model.