Abstract
The poly(4-hydroxystyrene) (P4HS)-poly(vinyl acetate) (PVA) system was studied at 170 o C by inverse gas chromatography. Specific retention volumes of several probes in the homopolymers and four blends (0.26, 0.38, 0.51, and 0.76 P4HS volume fractions) were used to measure the thermodynamic interaction between the polymers. The polymer-polymer interaction parameter χ 23 calculated from the Scott-Flory-Hugging formalism showed an apparent dependence on the probes. A method based on the equation-of-state theory was applied to eliminate the influence of the probe on χ 23 . Negative values of the polymer-polymer interaction parameter confirm the miscibility of the system
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