Interaction between polymers in dilute solutions of two polymers in a single solvent measured by light scattering and the compatibility of polymers

Abstract The intensity of light scattered from dilute solutions of mixtures of two nonidentical polymers in a single solvent was measured. The parameter A 24 characterising the thermo‐dynamic interaction of two nonidentical polymer molecules in solution was calculated for several systems polymer 2 ‐ polymer 4 ‐ solvent. For chemically strongly different polymers, A 24 is independent of molecular weights of the polymers and probably also of solvent. A 24 is related to the compatibility of both polymers and decreases contrary to expectation with increasing chemical difference between polymers 2 and 4.