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Liquid-liquid phase separation in polysulfone/solvent/water systems

✍ Scribed by Je Young Kim; Hwan Kwang Lee; Ki Jun Baik; Sung Chul Kim

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
288 KB
Volume
65
Category
Article
ISSN
0021-8995

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✦ Synopsis

The cloud point curves for polysulfone (PSf)/solvent/water systems were determined by a titration method. A small amount of water was needed to induce liquid-liquid demixing and the temperature effect was small. From numerical calculations, it was found that the binary interaction parameters for the PSf/solvent/water system enlarges the homogeneous region in the phase diagram with a smaller nonsolvent-polymer interaction parameter x 13 , a greater nonsolvent-solvent interaction parameter x 12 , and a smaller solvent-polymer interaction parameter x 23 and the effect of polymer molecular weight was negligible except in the range of low molecular weight. The phase diagrams, calculated with constant x 12 that was chosen from the concentration-dependent interaction parameter g 12 value of the concentration range, were similar to the results obtained with g 12 . The slope of the tie lines indicated that demixing of the ternary system occurred at relatively similar nonsolvent concentration in both phases. A value of 2.7 for the water-PSf interaction parameter was obtained by fitting the experimental cloud point curve with the calculated binodal lines.

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