Systèmes ternaires: Polymère A/polymère B/solvant. Influence de la nature du solvant sur l'incompatibilité des polymères

The limiting viscosity number of a polymer A, measured in a solution of a polymer B in a solvent S, is lower than that of the same polymer A, measured in the pure solvent S. There is a rather good correlation between the corresponding lowering of [η] and the critical demixtion volumes measured for various ternary systems polymer A/polymer B and various solvents. Moreover, the difference between the exponents of the viscosity laws measured for each of the polymers A and B in various solvents may be related to the corresponding critical demixtion volumes. Following these conclusions, it can be expected that to get a maximum compatibility for a given system of 2 polymers, the solvent should be chosen such as to have comparable affinities to each of them.