Abstract
The osmotic compressibility up to high concentrations as well as the second virial coefficient were measured for low molecular weight polystyrenes dissolved in a poor solvent cyclohexane at 35, 25, and 15 °C, by sedimentation equilibrium. The results of the osmotic compressibility over wide concentration ranges were favorably compared with a recently developed thermodynamic perturbation theory based on the spherocylinder model bearing a square-well potential, and from the comparison, the hard-core diameter d and the depth ε of the attractive square-well potential including in the theory were determined for polystyrene in cyclohexane. Compared with the previous results of d and ε for the same polymer in 15 °C toluene (a good solvent), it turned out that ε increases and d decreases with reducing the solvent quality.
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Oribe, M., Sato, T. Repulsive and Attractive Interactions between Polystyrene Chains in a Poor Solvent. Polym J 36, 747–753 (2004). https://doi.org/10.1295/polymj.36.747
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DOI: https://doi.org/10.1295/polymj.36.747