Thermodynamics of polyisobutylene solutions. i. Interaction parameters from osmotic pressure data

The Maron theory of nonelectrolyte solutions was used to analyze available osmotic pressure data for solutions of polyisobutylene in benzene, chlorobenzene, toluene, and cyclohexane and to evaluate the interaction parameters, μ, for these systems. The results obtained show that for the benzene and chlorobenzene solutions the μ's are linear functions of volume fraction and temperature, but they are not dependent on molecular weight. On the other hand, the solutions of polyisobutylene in toluene and cyclohexane show a dependence of μ on molecular weight and, in all probability, also on volume fraction and temperature. However, the data available are insufficient to establish the exact dependence of μ on v2 and T for the latter two systems.