INTERACTION VIRIAL-COEFFICIENTS IN SOME MIXED POLYMER-SOLUTIONS

The concentration dependence of the osmotic pressure for some aqueous ternary systems (polymer 2/polymer 4/water) has been studied up to relatively high concentrations. The interaction in the ternary systems has been evaluated in terms of mixed virial coefficients up to the third order (A//2//4, A//2//2//4 A//2//4//4). Data are also given for the corresponding binary systems. The polymers used were dextra, poly(N-vinyl-2-pyrrolidone), Ficoll, hydroxypropylcellulose and ethylhydroxyethylcellulose. An analysis of the relative contributions to the total osmotic pressure of various terms as a function of concentration is made.