Measurements of osmotic pressures of polyvinyl acetate solutions in various solvents have been made. These pressures are precise to ±0.005 cm. of solvent and can be repeated on successive samples to 0.02 cm. In five solvents, plots of reduced osmotic pressure (π/C2) against concentration show distinct upward curvature which differs significantly from theoretical equations derived by Flory and by Huggins. The evidence suggests that further refinement of these theoretical equations is required to bring them into exact agreement with experimental data.
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McLeod et al. (1951) studied this question.
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