Abstract
Inverse gas chromatography was employed to determine the apparent polymer-polymer interaction parameter χ′ 23,app for the following blends using them as binary stationary phases: poly(vinyl acetate)-poly(n-butyl methacrylate) at 100 and 120°C, poly(vinyl acetate)-atactic poly(vinyl isobutyl ether) at 70°C, and poly(n-butyl methacrylate)-atactic poly(vinyl isobutyl ether) at 70°C. The interaction parameter χ′ 23,app depended significantly on the chemical nature of the solvent (probe) used and the composition of the stationary phase. The lowest values of χ′ 23,app were obtained when aromatic and chlorinated-alkane probes were eluted on stationary phases having weight fractional compositions of the component polymers in the range 0.4–0.6. The results predict a better compatibility for poly(n-butyl methacrylate)-atactic poly(vinyl isobutyl ether) than for the other blends.
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