Abstract
Concentrated solutions of poly(vinyl acetate)/toluene and poly(dimethyl siloxane)/octane were investigated in the polymer volume fraction range 0.08 ⩽ ϕ ⩽ 0.5 using small angle X-ray scattering. As the concentration increases the polymer-polymer correlation length deviates increasingly from the prediction of simple scaling theory. The osmotic compressibility governing the scattering intensity extrapolated to zero angle I(0) is satisfactorily described by a Flory-Huggins type equation containing an interaction parameter of the form x + wϕ. The coefficients of the interaction parameter are found to be PVAc/toluene: χ=0.445±0.005, w=0.15 3±0.01 1 PDMS/octane χ=0.318±0.009, w=0.15 7±0.02 0.
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