Dilute solution properties of anionic polystyrene in ternary mixture toluene-2-butanone-2-methyl-1-propanol

✍ Scribed by B. Friedrich; K. Procházka

• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 338 KB
• Volume: 15
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(79)90189-7

✦ Synopsis

Several polystyrene samples with relatively narrow molecular weigkt distributions have been prepared by anionic polymerization. Dilute solution properties of these samples in binary and ternary liquid mixtures were investigated by light scattering and viscometry, using toluerle and 2-butanone as solvents and 2-methyl-l-propanol as non-solvent. At 25 ° experiments were performed to find a set of compositions of the mixed solvent where the second virial coefficient of the osmotic pressure expansion equals zero for the polymer solution, and a set of compositions of the mixed solvent where the intrinsic viscosity of the polymer solution equals the value for polystyrene in a theta solvent, such as cyclohexane at 34.5 °. The results suggest that these sets of compositions are not identical. The specific effects of sorption and preferential sorption which give rise to the difference between the sets of compositions are qualitatively discussed in terms of the Flory-Huggins theory.