Abstract
An attempt was made to interpret significant differences in thermodynamic parameters, including the concentration dependence coefficients p1 and p2 of the polymer–solvent interaction parameter χ, Flory entropy parameter at infinite dilution ψ0, Flory temperature θ, observed between atactic polystyrene (PS) in aromatic and aliphatic solvents by the characteristic features of the dissolved state of PS in aromatic solvents. For this purpose, 1H NMR spectra were measured on PS/benzene, cyclohexane, toluene, and methylcyclohexane systems and the infrared spectra and adiabatic compressibility were determined for the former two solvents. In PS/aromatic solvents H2-, H3-, and H4-phenyl proton peaks are shifted to a lower magnetic field than those in PS/aliphatic solvent, which was produced by hydrogenation of the aromatic solvent. The degree of solvation is slightly larger in benzene than in cyclohexane. The experimental results were explained only by the case where the PS phenyl ring was stacked in parallel to the solvent phenyl ring for PS/aromatic solvent systems.
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Kamide, K., Matsuda, S. & Kowsaka, K. Dissolved State of Atactic Polystyrene in Aromatic Solvents: Approaches through 1H NMR, FT-IR and Adiabatic Compressibility. Polym J 20, 231–241 (1988). https://doi.org/10.1295/polymj.20.231
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DOI: https://doi.org/10.1295/polymj.20.231